Title of Invention: System And Methods For Using Sound Waves To Wirelessly Deliver Power To Electronic Devices Abstract: Wireless charging systems, and methods of use thereof, are disclosed herein. As an example, a method includes: receiving, at a computer system, information identifying a location of a receiver device that requires charging, the location is within a predetermined range of the computer system; transmitting a first set of sound waves, via one or more transducer elements of a first pocket-forming transmitter that is coupled with the computer system, that converge in 3-D space proximate to the predetermined location of the receiver device to form a pocket of energy; while transmitting the first set of sound waves: (i) receiving a second set of sound waves from a second pocket-forming transmitter, distinct from the first pocket-forming transmitter; and (ii) charging the computer system by converting energy from the second set of sound waves into usable power. Detailed Description: RELATED APPLICATIONS This application is a continuation-in-part of the following applications: U.S. patent application Ser. No. 14/276,811, filed May 13, 2014; U.S. patent application Ser. No. 14/276,786, filed May 13, 2014; U.S. patent application Ser. No. 14/276,606, filed May 13, 2014; U.S. patent application Ser. No. 14/273,843, filed May 9, 2014; U.S. patent application Ser. No. 14/273,271, filed May 8, 2014; U.S. patent application Ser. No. 14/273,253, filed May 8, 2014; U.S. patent application Ser. No. 14/295,003, filed Jun. 3, 2014; U.S. patent application Ser. No. 14/266,991, filed May 1, 2014; U.S. patent application Ser. No. 14/622,451, filed Feb. 13, 2015; U.S. patent application Ser. No. 15/237,478, filed Aug. 15, 2016; and U.S. patent application Ser. No. 14/295,032, filed Jun. 3, 2014. Each of these applications is hereby incorporated by reference in its entirety. TECHNICAL FIELD The disclosed embodiments relate generally to wireless power transmission systems and, in particular, to wirelessly transmitting sound waves that are used to provide power to an electronic device. BACKGROUND Portable electronic devices, such as laptop computers, mobile phones, tablets, and other electronic devices, require frequent charging of a power-storing component (e.g., a battery) to operate. Many electronic devices require charging one or more times per day. Often, charging an electronic device requires manually connecting an electronic device to an outlet or other power source using a wired charging cable. In some cases, the power-storing component is removed from an electronic device and inserted into charging equipment. Accordingly, charging is time consuming, burdensome, and inefficient because users must carry around multiple charging cables and/or other charging devices, and frequently must locate appropriate power sources to charge their electronic devices. Additionally, conventional charging techniques potentially deprive a user of the ability to use the device while it is charging, and/or require the user to remain next to a wall outlet or other power source to which their electronic device or other charging equipment is connected. Some other conventional charging systems utilize inductive coils to generate a magnetic field that is used to charge a device. However, such inductive coupling has a limited short range, such as a few inches or less. Users typically must place the device at a specific position on a charging pad and are unable to move the device to different positions on the pad, without interrupting or terminating the charging of the device. This results in a frustrating experience for many users as they may be unable to locate the device at the exact right position on the pad to start charging their device. SUMMARY There is a need for systems and methods for wirelessly delivering power to electronic devices using sound waves. In some embodiments, a method of wirelessly transmitting power using sound waves is provided. The method includes: receiving, at a computer system, information identifying a location of a receiver device that requires charging, wherein the location is within a predetermined range of the computer system; transmitting a first set of sound waves, via one or more transducer elements of a first pocket-forming transmitter that is coupled with the computer system, that converge in three-dimensional space proximate to the predetermined location of the receiver device to form a pocket of energy at the location; while transmitting the first set of sound waves that converge in three-dimensional space proximate to the location of the receiver device to form the pocket of energy at the location: (i) receiving a second set of sound waves from a second pocket-forming transmitter, distinct from the first pocket-forming transmitter; and (ii) charging the computer system by converting energy from the second set of sound waves into usable power. Note that the various embodiments described above can be combined with any other embodiments described herein. The features and advantages described in the specification are not all inclusive and, in particular, many additional features and advantages will be apparent to one of ordinary skill in the art in view of the drawings, specification, and claims. Moreover, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. BRIEF DESCRIPTION OF THE DRAWINGS So that the present disclosure can be understood in greater detail, a more particular description may be had by reference to the features of various embodiments, some of which are illustrated in the appended drawings. The appended drawings, however, merely illustrate pertinent features of the present disclosure and are therefore not to be considered limiting, for the description may admit to other effective features. FIG. 1 is a block diagram showing components of a wireless power transmission system, in accordance with some embodiments. FIG. 2A is a block diagram showing components of a transmitter used in some wireless power transmission systems, in accordance with some embodiments. FIG. 2B is a block diagram showing multiple transmitters controlled by a single microcontroller, in accordance with some embodiments. FIG. 2C is a block diagram of a flat panel transducer array that may be used in a transmitter, in accordance with some embodiments. FIGS. 2D-2F show arrangements of transducer arrays that may be used in a transmitter, in accordance with some embodiments. FIG. 3A is a block diagram showing components of a receiver used in some wireless power transmission systems, in accordance with some embodiments. FIG. 3B is a block diagram of an electronic device including at least one embedded receiver and at least one auxiliary power supply for improving the life of the electronic device's main power supply, in accordance with some embodiments. FIG. 4A is a flow diagram of an example routine that may be utilized by a microcontroller of a transmitter to authenticate devices requiring wireless power transmission, in accordance with some embodiments. FIG. 4B is a flow diagram of an example routine that may be utilized by a microcontroller of a transmitter to deliver power to devices that have been previously authenticated, in accordance with some embodiments. FIG. 4C is a flow diagram of an example routine that may be utilized by a microcontroller of a transmitter (e.g., a transmitter that is associated with a base station, such as that described below in reference to FIG. 10) to deliver power to a receiver, in accordance with some embodiments. FIG. 5A is an illustration including an electronic device associated with a user, in the form of a Bluetooth headset worn by the user, including at least one embedded receiver for receiving wireless power transmissions from a transmitter, in accordance with some embodiments. FIG. 5B is an illustration including an electronic device, in the form of a wearable computing device such as a wristwatch, including at least one embedded receiver, for receiving wireless power transmissions from a transmitter, in accordance with some embodiments. FIG. 5C is a flow diagram of an algorithm that may be used to manage power loads on an electronic device, in accordance with some embodiments. FIG. 6A is an illustration showing a wireless power transmission system used for charging one or more peripheral devices via a transmitter associated with a laptop computer, in accordance with some embodiments. FIG. 6B is an exploded view of a laptop screen, showing components including an embedded wireless power transmitter, in accordance with some embodiments. FIG. 6C is an exploded view of a laptop screen, showing components including an embedded wireless power transmitter and an embedded wireless power receiver, in accordance with some embodiments. FIG. 6D is an illustration showing a wireless power transmission system in which a laptop computer may receive and transmit sound waves in a substantially simultaneous fashion, in accordance with some embodiments. FIG. 6E is a flow diagram of a wireless power transmission process that may be implemented for charging one or more peripheral devices using a laptop computer, in accordance with some embodiments. FIGS. 7A-7B are illustrations of game controllers that are coupled with wireless power receivers, in accordance with some embodiments. FIGS. 7C-7G illustrate various wireless power transmission systems in which power is wirelessly delivered to electronic devices using sound waves, in accordance with some embodiments. FIG. 7H illustrates an improved rollable electronic paper display used to explain certain advantages of wireless power transmission systems, in accordance with some embodiments. FIGS. 8A-8G illustrate various articles (e.g., heating blanket, heating sock, heating glove, warming jacket, shirt, cap, and cooling shirt) with embedded wireless power receivers, in accordance with some embodiments. FIGS. 9A-9B are illustrations of medical devices with wireless power receivers coupled thereto, in accordance with some embodiments. FIGS. 9C-9E are illustrations of wireless power transmission systems for wirelessly delivering power to medical devices, in accordance with some embodiments. FIG. 10 is an illustration of a house configured with a number of wireless power transmitters and receivers, in accordance with some embodiments. FIG. 11A illustrates a law enforcement officer wearing a uniform with an integrated wireless power receiver, in accordance with some embodiments. FIGS. 11B-11D illustrate wireless power transmitters integrated with various types of mobile law enforcement equipment (e.g., a police squad car and a SWAT team vehicle) for use in conjunction with law enforcement operations, in accordance with some embodiments. FIGS. 12A-12D illustrate tracking systems that upload to a cloud-based service for use in conjunction with wireless power transmission systems, in accordance with some embodiments. In accordance with common practice, the various features illustrated in the drawings may not be drawn to scale. Accordingly, the dimensions of the various features may be arbitrarily expanded or reduced for clarity. In addition, some of the drawings may not depict all of the components of a given system, method or device. Finally, like reference numerals may be used to denote like features throughout the specification and figures. DETAILED DESCRIPTION Numerous details are described herein in order to provide a thorough understanding of the example embodiments illustrated in the accompanying drawings. However, some embodiments may be practiced without many of the specific details, and the scope of the claims is only limited by those features and aspects specifically recited in the claims. Furthermore, well-known processes, components, and materials have not been described in exhaustive detail so as not to unnecessarily obscure pertinent aspects of the embodiments described herein. In some embodiments, one or more transmitters generate power waves to form pockets of energy at target locations and adjust power wave generation based on sensed data to provide safe, reliable, and efficient wirelessly-delivered power to receivers (and devices associated therewith). In some embodiments, the power waves are sound waves that are transmitted in frequencies between 10 kHz and 50 kHz. In some embodiments, a controlled “pocket of energy” (e.g., a region in which available power is high due to constructive interference of power waves) and/or null spaces (e.g., a region in which available power is low or nonexistent due to destructive interference of power waves) may be formed by convergence of the power waves transmitted into a transmission field of the one or more transmitters. In some embodiments, pockets of energy form at one or more locations in a two- or three-dimensional field due to patterns of constructive interference caused by convergences of transmitted power waves. Energy from the transmitted power waves may be harvested by receivers (i.e., received and converted into usable power) at the one or more locations. In some embodiments, adaptive pocket-forming is performed, e.g., by adjusting power wave transmission to achieve a target power level for at least some of the power waves transmitted by the one or more transmitters. For example, a system for adaptive pocket-forming includes a sensor. In some embodiments, when the sensor detects an object, such as a sensitive object (e.g., a person, an animal, equipment sensitive to the power waves, and the like) within a predetermined distance (e.g., a distance within a range of 1-5 feet) of a pocket of energy, of one or more of the power waves, or of a transmitter, then a respective transmitter of the one or more transmitters adjusts one or more characteristics of transmitted power waves. Non-limiting examples of the one or more characteristics include: frequency, amplitude, trajectory, phase, and other characteristics used by one or more antennas of the one or more transmitters to transmit the power waves. As one example, in response to receiving information indicating that transmission of power waves by a respective transmitter of the one or more transmitters should be adjusted (e.g., a sensor senses a sensitive object within a predetermined distance of a respective target location), the adaptive pocket-forming process adjusts the one or more characteristics accordingly. In some embodiments, adjusting the one or more characteristics includes reducing a currently generated power level at a location by adjusting one or more transmitted power waves that converge at the target location. In some embodiments, reducing a currently generated power level includes transmitting a power wave that causes destructive interference with at least one other transmitted power wave. For example, a power wave is transmitted with a first phase that is shifted relative to a second phase of at least one other power wave to destructively interfere with the at least one other power wave in order to diminish or eliminate the currently generated power level at the target location. In some embodiments, adjusting the one or more characteristics includes increasing a power level for some of the transmitted power waves to ensure that the receiver receives adequate energy sufficient to quickly charge a power-storing component of an electronic device that is associated with the receiver. In some embodiments, an object is “tagged” (e.g., an identifier of the object is stored in memory in association with a flag) to indicate that the detected object is a sensitive object. In response to detection of a particular object within a predetermined distance of a target location, a determination is made as to whether the particular object is a sensitive object. In some embodiments, this determination includes performing a lookup in the memory to check whether the particular object has been previously tagged and is therefore known as a sensitive object. In response to determining that the particular object is a sensitive object, the one or more characteristics used to transmit the power waves are adjusted accordingly. In some embodiments, sensing a sensitive object includes using a series of sensor readings from one or more sensors to determine motion of an object within a transmission field of the one or more transmitters. In some embodiments, sensor output from one or more sensors is used to detect motion of the object approaching within a predetermined distance of a pocket of energy or of power waves used to form the pocket of energy. In response to a determination that a sensitive object is approaching (e.g., moving toward and/or within a predefined distance of a pocket of energy), the currently generated power level at the location of the pocket of energy is reduced. In some embodiments, the one or more sensors include sensors that are internal to the one or more transmitters, the receiver, and/or sensors that are external to the one or more transmitters and the receiver and may include thermal imaging, optical, radar, and other types of sensors capable to detecting objects within a transmission field. Although some embodiments herein include the use of sound-wave-based (or RF-based wave) transmission technologies as a primary example, it should be appreciated that the wireless charging techniques that might be employed are not be limited to such technologies and transmission techniques. Rather, it should be appreciated that additional or alternative wireless charging techniques may be utilized, including any suitable technology and technique for wirelessly transmitting energy so that a receiver is capable of converting the transmitted energy to electrical power. Such technologies or techniques may transmit various forms of wirelessly transmitted energy including the following non-limiting examples: microwave, laser light, infrared, or other forms of electromagnetic energy. FIG. 1 illustrates components of an example wireless power transmission environment 100, in accordance with some embodiments. Wireless power transmission environment 100 includes, e.g., transmitters 102 (e.g., transmitters 102a, 102b . . . 102n) and a receiver 120. In some embodiments, the wireless power transmission environment 100 includes a number of receivers 120, each of which is associated with a respective electronic device 122. An example transmitter 102 (e.g., transmitter 102a) includes, e.g., one or more processor(s) 104, a memory 106, one or more antenna arrays 110, one or more communications components 112, and/or one or more transmitter sensors 114. In some embodiments, these components are, interconnected via a communications bus 108. References to these components of transmitters 102 cover embodiments in which one or more than one of each of these components (and combinations thereof) are included. In some embodiments, memory 106 stores one or more programs (e.g., sets of instructions) and/or data structures, collectively referred to as “modules” herein. In some embodiments, memory 106, or the non-transitory computer readable storage medium of memory 106 stores the following programs, modules, and data structures, or a subset or superset thereof: information received from receiver 120 (e.g., generated by receiver sensor 128 and then transmitted to the transmitter 102a); information received from transmitter sensor 114; an adaptive pocket-forming module that adjusts one or more power waves transmitted by one or more transmitters 102; and/or a beacon transmitting module that transmits a communication signal 118 for detecting a receiver 120 (e.g., within a transmission field of the one or more transmitters 102). The above-identified modules (e.g., data structures and/or programs including sets of instructions) need not be implemented as separate software programs, procedures, or modules, and thus various subsets of these modules may be combined or otherwise re-arranged in various embodiments. In some embodiments, memory 106 stores a subset of the modules identified above. In some embodiments, an external mapping memory 132 that is communicatively connected to communications component 112 stores one or more modules identified above. Furthermore, the memory 106 and/or external mapping memory 132 may store additional modules not described above. In some embodiments, the modules stored in memory 106, or a non-transitory computer readable storage medium of memory 106, provide instructions for implementing respective operations in the methods described below. In some embodiments, some or all of these modules may be implemented with specialized hardware circuits that subsume part or all of the module functionality. One or more of the above-identified elements may be executed by one or more of processor(s) 104. In some embodiments, one or more of the modules described with regard to memory 106 is implemented on memory 104 of a server (not shown) that is communicatively coupled to one or more transmitters 102 and/or by a memory of electronic device 122 and/or receiver 120. In some embodiments, a single processor 104 (e.g., processor 104 of transmitter 102a) executes software modules for controlling multiple transmitters 102 (e.g., transmitters 102b . . . 102n). In some embodiments, a single transmitter 102 (e.g., transmitter 102a) includes multiple processors 104, such as one or more transmitter processors (configured to, e.g., control transmission of signals 116 by antenna array 110), one or more communications component processors (configured to, e.g., control communications transmitted by communications component 112 and/or receive communications via communications component 112) and/or one or more sensor processors (configured to, e.g., control operation of transmitter sensor 114 and/or receive output from transmitter sensor 114). Receiver 120 (e.g., a receiver of electronic device 122) receives power signals 116 and/or communications 118 transmitted by transmitters 102. In some embodiments, receiver 120 includes one or more antennas 124 (e.g., antenna array including multiple antenna elements), power converter 126, receiver sensor 128 and/or other components or circuitry. References to these components of receiver 120 cover embodiments in which one or more than one of each of these components (and combinations thereof) are included. Receiver 120 converts energy from received signals 116 (e.g., power waves) into electrical energy to power and/or charge electronic device 122. For example, receiver 120 uses power converter 126 to convert captured energy from power waves 116 to alternating current (AC) electricity or direct current (DC) electricity usable to power and/or charge electronic device 122. Non-limiting examples of power converter 126 include rectifiers, rectifying circuits, voltage conditioners, among suitable circuitry and devices. In some embodiments, receiver 120 receives one or more power waves 116 directly from transmitter 102. In some embodiments, receiver 120 harvests power waves from one or more pockets of energy created by one or more power waves 116 transmitted by transmitter 102. In some embodiments, after the power waves 116 are received and/or energy is harvested from a pocket of energy, circuitry (e.g., integrated circuits, amplifiers, rectifiers, and/or voltage conditioner) of the receiver 120 converts the energy of the power waves (e.g., radio frequency electromagnetic radiation) to usable power (i.e., electricity), which powers electronic device 122 and/or is stored to battery 130 of electronic device 122. In some embodiments, a rectifying circuit of the receiver 120 translates the electrical energy from AC to DC for use by electronic device 122. In some embodiments, a voltage conditioning circuit increases or decreases the voltage of the electrical energy as required by the electronic device 122. In some embodiments, an electrical relay conveys electrical energy from the receiver 120 to the electronic device 122. In some embodiments, receiver 120 is a component of an electronic device 122. In some embodiments, a receiver 120 is coupled (e.g., detachably coupled) to an electronic device 122. In some embodiments, electronic device 122 is a peripheral device of receiver 120. In some embodiments, electronic device 122 obtains power from multiple transmitters 102 and/or using multiple receivers 120. In some embodiments, the wireless power transmission environment 100 includes a plurality of electronic devices 122, each having at least one respective receiver 120 that is used to harvest power waves from the transmitters 102 into usable power for charging the electronic devices 122. In some embodiments, the one or more transmitters 102 adjust one or more characteristics (e.g., phase, gain, direction, and/or frequency) of power waves 116. For example, a transmitter 102 (e.g., transmitter 102a) selects a subset of one or more antenna elements of antenna array 110 to initiate transmission of power waves 116, cease transmission of power waves 116, and/or adjust one or more characteristics used to transmit power waves 116. In some implementations, the one or more transmitters 102 adjust power waves 116 such that trajectories of power waves 116 converge at a predetermined location within a transmission field (e.g., a location or region in space), resulting in controlled constructive or destructive interference patterns. In some embodiments, respective antenna arrays 110 of the one or more transmitters 102 may include a set of one or more antennas configured to transmit the power waves 116 into respective transmission fields of the one or more transmitters 102. Integrated circuits (not shown) of the respective transmitter 102, such as a controller circuit and/or waveform generator, may control the behavior of the antennas. For example, based on the information received from the receiver via the communications signal 118, a controller circuit may determine a set of one or more characteristics or waveform characteristics (e.g., amplitude, frequency, trajectory, phase, among other characteristics) used for transmitting the power waves 116 that would effectively provide power to the receiver 120 and electronic device 122. The controller circuit may also identify a subset of antennas from the antenna arrays 110 that would be effective in transmitting the power waves 116. As another example, a waveform generator circuit of the respective transmitter 102 coupled to the processor 104 may convert energy and generate the power waves 116 having the waveform characteristics identified by the controller, and then provide the power waves to the antenna arrays 110 for transmission. In some instances, constructive interference of power waves occurs when two or more power waves 116 are in phase with each other and converge into a combined wave such that an amplitude of the combined wave is greater than amplitude of a single one of the power waves. For example, the positive and negative peaks of sinusoidal waveforms arriving at a location from multiple antennas “add together” to create larger positive and negative peaks. In some embodiments, a pocket of energy is formed at a location in a transmission field where constructive interference of power waves occurs. In some instances, destructive interference of power waves occurs when two or more power waves are out of phase and converge into a combined wave such that the amplitude of the combined wave is less than the amplitude of a single one of the power waves. For example, the power waves “cancel each other out,” thereby diminishing the amount of energy concentrated at a location in the transmission field. In some embodiments, destructive interference is used to generate a negligible amount of energy or “null” at a location within the transmission field where the power waves converge. In some embodiments, the one or more transmitters 102 transmit power waves 116 that create two or more discrete transmission fields (e.g., overlapping and/or non-overlapping discrete transmission fields). In some embodiments, a first transmission field is managed by a first processor 104 of a first transmitter (e.g. transmitter 102a) and a second transmission field is managed by a second processor 104 of a second transmitter (e.g., transmitter 102b). In some embodiments, the two or more discrete transmission fields (e.g., overlapping and/or non-overlapping) are managed by the transmitter processors 104 as a single transmission field. In some embodiments, communications component 112 transmits communication signals 118 via a wired and/or wireless communication connection to receiver 120. In some embodiments, communications component 112 generates communications signals 118 used for triangulation of receiver 120. In some embodiments, communication signals 118 are used to convey information between transmitter 102 and receiver 120 for adjusting one or more characteristics used to transmit the power waves 116. In some embodiments, communications signals 118 include information related to status, efficiency, user data, power consumption, billing, geo-location, and other types of information. In some embodiments, receiver 120 includes a transmitter (not shown), or is a part of a transceiver, that transmits communications signals 118 to communications component 112 of transmitter 102. In some embodiments, communications component 112 (e.g., communications component 112 of transmitter 102a) includes a communications component antenna for communicating with receiver 120 and/or other transmitters 102 (e.g., transmitters 102b through 102n). In some embodiments, these communications signals 118 represent a distinct channel of signals transmitted by transmitter 102, independent from a channel of signals used for transmission of the power waves 116. In some embodiments, the receiver 120 includes a receiver-side communications component (not shown) configured to communicate various types of data with one or more of the transmitters 102, through a respective communications signal 118 generated by the receiver-side communications component. The data may include location indicators for the receiver 120 and/or electronic device 122, a power status of the device 122, status information for the receiver 120, status information for the electronic device 122, status information about the power waves 116, and/or status information for pockets of energy. In other words, the receiver 120 may provide data to the transmitter 101, via the communications signal 118, regarding the current operation of the system 100, including: information identifying a present location of the receiver 120 or the device 122, an amount of energy received by the receiver 120, and an amount of power received and/or used by the electronic device 122, among other possible data points containing other types of information. In some embodiments, the data contained within communications signals 118 is used by electronic device 122, receiver 120, and/or transmitters 102 for determining adjustments of the one or more characteristics used by the antenna array 110 to transmit the power waves 106. Using a communications signal 118, the transmitter 102 communicates data that is used, e.g., to identify receivers 120 within a transmission field, identify electronic devices 122, determine safe and effective waveform characteristics for power waves, and/or hone the placement of pockets of energy. In some embodiments, receiver 120 uses a communications signal 118 to communicate data for, e.g., alerting transmitters 102 that the receiver 120 has entered or is about to enter a transmission field, provide information about electronic device 122, provide user information that corresponds to electronic device 122, indicate the effectiveness of received power waves 116, and/or provide updated characteristics or transmission parameters that the one or more transmitters 102 use to adjust transmission of the power waves 116. As an example, the communications component 112 of the transmitter 102 communicates (e.g., transmits and/or receives) one or more types of data (including, e.g., authentication data and/or transmission parameters) including various information such as a beacon message, a transmitter identifier, a device identifier for an electronic device 122, a user identifier, a charge level for electronic device 122, a location of receiver 120 in a transmission field, and/or a location of electronic device 122 in a transmission field. In some embodiments, transmitter sensor 114 and/or receiver sensor 128 detect and/or identify conditions of electronic device 122, receiver 120, transmitter 102, and/or a transmission field. In some embodiments, data generated by transmitter sensor 114 and/or receiver sensor 128 is used by transmitter 102 to determine appropriate adjustments to the one or more characteristics used to transmit the power waves 106. Data from transmitter sensor 114 and/or receiver sensor 128 received by transmitter 102 includes, e.g., raw sensor data and/or sensor data processed by a processor 104, such as a sensor processor. Processed sensor data includes, e.g., determinations based upon sensor data output. In some embodiments, sensor data received from sensors that are external to the receiver 120 and the transmitters 102 is also used (such as thermal imaging data, information from optical sensors, and others). In some embodiments, receiver sensor 128 is a gyroscope that provides raw data such as orientation data (e.g., tri-axial orientation data), and processing this raw data may include determining a location of receiver 120 and/or or a location of receiver antenna 124 using the orientation data. In some embodiments, receiver sensor 128 includes one or more infrared sensors (e.g., that output thermal imaging information), and processing this infrared sensor data includes identifying a person (e.g., indicating presence of the person and/or indicating an identification of the person) or other sensitive object based upon the thermal imaging information. In some embodiments, receiver sensor 128 includes a gyroscope and/or an accelerometer that indicates an orientation of receiver 120 and/or electronic device 122. As one example, transmitters 102 receive orientation information from receiver sensor 128 and the transmitters 102 (or a component thereof, such as the processor 104) use the received orientation information to determine whether electronic device 122 is flat on a table, in motion, and/or in use (e.g., next to a user's head). In some embodiments, receiver sensor 128 is a sensor of electronic device 122 (e.g., an electronic device 122 that is remote from receiver 120). In some embodiments, receiver 120 and/or electronic device 122 includes a communication system for transmitting signals (e.g., sensor signals output by receiver sensor 128) to transmitter 102. Non-limiting examples of transmitter sensor 114 and/or receiver sensor 128 include, e.g., infrared, pyroelectric, ultrasonic, laser, optical, Doppler, gyro, accelerometer, microwave, millimeter, RF standing-wave sensors, resonant LC sensors, capacitive sensors, and/or inductive sensors. In some embodiments, technologies for transmitter sensor 114 and/or receiver sensor 128 include binary sensors that acquire stereoscopic sensor data, such as the location of a human or other sensitive object. In some embodiments, transmitter sensor 114 and/or receiver sensor 128 is configured for human recognition (e.g., capable of distinguishing between a person and other objects, such as furniture). Examples of sensor data output by human recognition-enabled sensors include: body temperature data, infrared range-finder data, motion data, activity recognition data, silhouette detection and recognition data, gesture data, heart rate data, portable devices data, and wearable device data (e.g., biometric readings and output, accelerometer data). In some embodiments, transmitters 102 adjust one or more characteristics used to transmit the power waves 116 to ensure compliance with electromagnetic field (EMF) exposure protection standards for human subjects. Maximum exposure limits are defined by US and European standards in terms of power density limits and electric field limits (as well as magnetic field limits). These include, for example, limits established by the Federal Communications Commission (FCC) for maximum permissible exposure (MPE), and limits established by European regulators for radiation exposure. Limits established by the FCC for MPE are codified at 47 CFR §1.1310. For electromagnetic field (EMF) frequencies in the microwave range, power density can be used to express an intensity of exposure. Power density is defined as power per unit area. For example, power density can be commonly expressed in terms of watts per square meter (W/m2), milliwatts per square centimeter (mW/cm2), or microwatts per square centimeter (μW/cm2). In some embodiments, output from transmitter sensor 114 and/or receiver sensor 128 is used by transmitter 102 to detect whether a person or other sensitive object enters a power transmission region (e.g., a location within a predetermined distance of a transmitter 102, power waves generated by transmitter 102, and/or a pocket of energy). In some embodiments, in response to detecting that a person or other sensitive object has entered the power transmission region, the transmitter 102 adjusts one or more power waves 116 (e.g., by ceasing power wave transmission, reducing power wave transmission, and/or adjusting the one or more characteristics of the power waves). In some embodiments, in response to detecting that a person or other sensitive object has entered the power transmission region, the transmitter 102 activates an alarm (e.g., by transmitting a signal to a loudspeaker that is a component of transmitter 102 or to an alarm device that is remote from transmitter 102). In some embodiments, in response to detecting that a person or other sensitive object has entered a power transmission region, the transmitter 102 transmits a digital message to a system log or administrative computing device. In some embodiments, antenna array 110 includes multiple antenna elements (e.g., configurable “tiles”) collectively forming an antenna array. Antenna array 110 generates, e.g., RF power waves, ultrasonic power waves, infrared power waves, and/or magnetic resonance power waves. In some embodiments, the antennas of an antenna array 110 (e.g., of a single transmitter, such as transmitter 102a, and/or of multiple transmitters, such as transmitters 102a, 102b, . . . , 102n) transmit two or more power waves that intersect at a defined location (e.g., a location corresponding to a detected location of a receiver 120), thereby forming a pocket of energy at the defined location. In some embodiments, transmitter 102 assigns a first task to a first subset of antenna elements of antenna array 110, a second task to a second subset of antenna elements of antenna array 110, and so on, such that the constituent antennas of antenna array 110 perform different tasks (e.g., determining locations of previously undetected receivers 120 and/or transmitting power waves 116 to one or more receivers 120). As one example, in an antenna array 110 with ten antennas, nine antennas transmit power waves 116 that form a pocket of energy and the tenth antenna operates in conjunction with communications component 112 to identify new receivers in the transmission field. In another example, an antenna array 110 having ten antenna elements is split into two groups of five antenna elements, each of which transmits power waves 116 to two different receivers 120 in the transmission field. Turning now to FIG. 2A, a block diagram is shown that includes certain components of a transmitter used in some wireless power transmission systems, in accordance with some embodiments. As shown in FIG. 2A, in some embodiments, a respective transmitter 200 (e.g., one of the transmitters 102 shown in FIG. 1 and described above) may include a housing 202 with at least two or more transducer elements 204, at least one sound wave integrated circuit (SWIC) 206, at least one microcontroller 208 (e.g., one or the processors 104, FIG. 1), and one or more communications components 112 (also shown in FIG. 1). In some embodiments, housing 202 is made of any suitable material which may allow for signal or wave transmission and/or reception, for example plastic or hard rubber. In some embodiments, the at least two transducer elements 204 may include suitable transducer types for operating in frequency bands such as 10 KHz to 50 KHz, or other suitable frequency bands for ultrasound waves. In some embodiments, the at least two transducer elements 204 are arranged in suitable combinations to transmit sound waves required to activate a receiver (e.g., receiver 120, FIG. 1), so that the receiver is able to harness energy from the sound waves for powering an electronic device associated with the receiver (e.g., electronic device 122, FIG. 1). Non-limiting examples of transducers include, for example, piezoelectric devices, piezo transducers of ceramic or other suitable materials, among others. In some embodiments, the transducer elements 204 are arranged in a pattern (e.g., as described below in reference to FIG. 2C). In some embodiments, shape and orientation of transducer elements 204 varies to match desired features of a respective transmitter 102, e.g., orientation of transducer elements 204 may be flat in X, Y, and Z axes, or may be otherwise oriented in three-dimensional space. In some embodiments, respective transducer elements 204 of a respective transmitter 102 may operate in independent frequencies, allowing a multichannel operation of transmitting sound waves and producing pockets of energy at desired locations within a transmission field of the transmitter. In some embodiments, the at least one SWIC 206 includes a proprietary chip for adjusting phases and/or relative magnitudes of sound wave signals which may serve as inputs for the at least two transducer elements 204 for transmitting sound waves that converge constructively to generate pockets of energy at desired locations with a transmission field of the transmitter 102. In some embodiments, these sound wave signals are produced using a power source 212 (e.g., an external or internal power source) and a local oscillator chip (not shown) using a suitable piezoelectric material. In some embodiments, the power source may include a battery of a device in which a transmitter 102 is embedded (e.g., a battery of laptop 602 which may have an embedded transmitter 102, FIG. 6A). In some embodiments, microcontroller 208 determines optimal times and locations for forming pockets of energy by processor at least in part by processing information sent by a receiver 120 to the communications component 112. In some embodiments, communications component 112 utilizes standard wireless communication protocols to communicate with the receiver, which may include Bluetooth, Wi-Fi or ZigBee communication protocols. In some embodiments, communications component 112 may be used to receive other information from the receiver such as an identifier for the device or user, battery level of an electronic device associated with the receiver, and/or location information about the electronic device. Non-limiting examples of communications components 112 include Bluetooth transceivers, radar, infrared cameras or sound devices for sonic triangulation for determining the device's position. In some embodiments, the transducer elements 204 are arranged in many different arrays, as shown in FIGS. 2C-2F, and explained in more detail below. FIG. 2B is a block diagram showing multiple transmitters controlled by a single microcontroller, in accordance with some embodiments. In some embodiments, a base station 240 may be utilized to help coordinate transmissions of sound waves by a plurality of transmitters 102a through 102n (additional details regarding transmitters 102 are provided above in reference to FIG. 2A). In some embodiments, the base station 240 may include one or more micro-controller 241, a power source 243, and a housing. In some embodiments, the base station 240 may include connections to each of the transmitters 102. Such connections may include a variety of types of connections, such as coaxial cable, phone cable, LAN cable, wireless connection via Wi-Fi or BLUETOOTH among others. In some embodiments, a respective connection between a transmitter 102 and the base station 240 may be used to link a respective SWIC 206 with the microcontroller 241 and the power source 243, to facilitate controlled transmission of sound waves for wirelessly delivering power to receivers and devices connected therewith. In some embodiments, the microcontroller 241 may control a variety of features of a respective SWIC 206, including timing for transmitting sound waves, direction of transmitted sound waves, bounce angles for transmitted sound waves, power intensity for transmitted sound waves, and the like, to allow for controlled creation of pockets of energy that form based on constructive interference of sound waves transmitted by the various transmitters 102. In some embodiments, the microcontroller 241 may control multiple transmitters 102 in near simultaneous fashion in order to facilitate creation of multiple pockets of energy. In some embodiments, the microcontroller 241 may also use manage and control communications between respective transmitters and between respective transmitters by controlling respective communication components 112. In this way, the base station 240 is configured to control various features of a single or multiple transmitters. In some embodiments, base station 240 is coupled with a power source 243, which in turn may be used to provide power to transmitters 102. In some embodiments, power source 243 includes an AC or DC power supply. Voltage, power, and current intensity provided by power source 243 may vary based in dependency with the required sound waves to be transmitted. Use of the power to create sound waves may be managed by microcontroller 241 and carried out by SWIC 206, which may utilize a plurality of methods and components to produce sound wave signals in a wide variety of frequencies, wavelengths, intensities, and other features. As an example, oscillators and piezoelectric crystals may be used to create and change sound frequencies in different transducer elements 204. In some embodiments, a variety of filters may be used for smoothing signals as well as amplifiers for increasing power to be transmitted. In some embodiments, having the base station 240 manage operations of one or many transmitters 102 allows a single point of control for transmitters located in various rooms or locations within a physical building (e.g., a user's house, as discussed below in reference to FIG. 10). In some embodiments, each respective transmitter 102 transmits sound waves at different or at the same frequencies, power intensities, amplitudes, etc. FIG. 2C is a block diagram of a flat panel transducer array 300 that may be used in a transmitter (e.g., a transmitter 102, such as those discussed above in reference to FIGS. 1, 2A, and 2B), in accordance with some embodiments. In some embodiments, the flat panel transducer array 300 includes N number of transducer elements 204, where gain requirements for transmitting sound waves are distributed across the N number of transducer elements 204. In some embodiments, the transducer elements 204 are distributed in an equally spaced grid (e.g., an 8×8 grid with a total of 64 transducer elements 204 or a 16×16 grid with a total of 256 transducer elements 204). The number of transducer elements 204 in a particular transducer array may vary in relation with desired range and power transmission capabilities for a respective transmitter 102 (i.e., the more transducer elements 204, the wider range and higher power transmission capability available for the respective transmitter 102). In some embodiments, the transducer array 300 may have a circular pattern or polygon arrangement of transducer elements 204. In some embodiments, the array 300 may also be divided into sets of transducer elements, and each set may then be distributed across multiple surfaces (multi-faceted). In some embodiments, a transducer array may operate as a single array, a pair array, a quad array, or any other suitable arrangement (as described below in reference to FIGS. 2D-2F), which may be designed to create a transmitter with desired sound wave transmission capabilities. FIGS. 2D-2F show arrangements of example transducer arrays 400a that may be used in a respective transmitter 102, in accordance with some embodiments. In particular, FIG. 2D shows a single array 402 where all transducer elements 204 may operate at 50 KHz. In some embodiments, the single array 402 may be used for transmitting sound waves to a single receiver for charging or powering a single electronic device. FIG. 2E shows an example pair array 404, including a top half 406 of transducer elements 204, and a bottom half 408 of transducer elements 204. In some embodiments, portions of the example pair array 404 may operate at different frequencies (e.g., each transducer element within the top half 406 may operate at 10 kHz and each transducer element in the bottom half 408 may operate at a frequency of 20 kHz). In some embodiments, transducer elements in each half of the example pair array 404 may vary in size (e.g., those in the top half are slightly smaller than those in the bottom half). FIG. 2F shows an example quad array 410 where one or more transducer elements 204 may be virtually divided to avoid power losses during wireless power transmission. In some embodiments, a respective transducer element 204c may be virtually divided into two transducer elements, transducer element 204c1 and transducer element 204c2. Transducer element 204c1 may be used for transmitting at a frequency of 50 kHz and transducer element 204c2 may be used for transmitting at a frequency of 10 kHz. In some embodiments, the quad array 410 arrangement of transducer elements may be used in situations where multiple receivers 120 operating at different frequency bands require power. FIG. 3A is a block diagram showing components of a receiver (e.g., receiver 120, FIG. 1) used in some wireless power transmission systems, in accordance with some embodiments. In some embodiments, receiver 120 includes a housing 302 with at least one sensor element 128 (also shown in FIG. 1), at least one rectifier 306, at least one power converter 308, and an optional communications component 310. In some embodiments, housing 302 is made of any suitable material which may allow for signal or wave transmission and/or reception, e.g., plastic or hard rubber. In some embodiments, housing 302 may be light, resistant to heat, water, corrosion resistant, durable, and adaptable to different types of environments (e.g., resistant to climate changes). In some embodiments, housing 302 may be part of an external hardware component that is added to different electronic equipment, e.g., in the form of a case, or may be embedded within electronic equipment. In some embodiments, housing 302 provides isolation for components of the receiver 120 to protect it from external factors, such as water and sweat (e.g., for embodiments in which a receiver is embedded in an article of clothing, such as those discussed below). In some embodiments, sensor element 128 may include suitable sensor types for operating in frequency bands similar to the bands described for transmitter 102 with reference to FIGS. 1 and 2A-2F. In some embodiments, sensor element 128 is any device capable of receiving sound waves or any combination of sounds or signals from a respective transmitter 102. Suitable sensor elements 128 include various types of microphones. In some embodiments, the sensor element 128 is a sound transducer (i.e., a sound sensor) that produces an electrical analog output signal which is proportional to an acoustic sound wave acting upon its flexible diaphragm. In some embodiments, this electrical analog output signal is an electrical image representing characteristics of a waveform representing the acoustic sound wave. In some embodiments, the output signal from a microphone produces an analog signal either in the form of a voltage or current which is proportional to the actual sound wave. Non-limiting examples of types of microphones available as sound transducers include dynamic, electret condenser, ribbon, and piezo-electric crystal types. In some embodiments, the sensor element 128 is a dynamic moving-coil microphone sound transducer that is configured to optimize wireless power reception from sound waves transmitted by a transmitter 102. In some embodiments, multiple different types of sensor elements 128 are included in a single receiver 120. Using multiple sensor elements 128 may be beneficial for a respective receiver 120 that is coupled with an electronic device that does not have a preferred orientation during usage or whose orientation may vary continuously through time, e.g., a smartphone or portable gaming system. In some embodiments, flexible, piezo transducers, distributed in specific
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