CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a National Phase 371 Application of PCT Application No. PCT/US06/041206, filed Oct. 23, 2006, entitled “SYSTEM AND METHOD FOR ACCOMMODATION OF DIGITAL AND ANALOG CHANNEL NUMBER CONFLICTS”. 
     
    
     FIELD OF THE INVENTION 
       [0002]    The present invention relates generally to searching and negotiating digital and analog television channels. 
       BACKGROUND OF THE INVENTION 
       [0003]    This section is intended to introduce the reader to various aspects of art, which may be related to various aspects of the present invention that are described and/or claimed below. This discussion is believed to be helpful in providing the reader with background information to facilitate a better understanding of the various aspects of the present invention. Accordingly, it should be understood that these statements are to be read in this light, and not as admissions of prior art. 
         [0004]    Digital cable, a service offered by many cable distributors, utilizes digital technology to facilitate provision of a larger number of channels to users than would be available with analog channels alone. Using video compression and digital channels, cable distributors may increase the number and diversity of programs available on their existing cable networks without requiring network additions. 
         [0005]    Cable television channels may support multiple digital subchannels. For example, a single channel may be utilized to broadcast multiple compressed subchannels. Accordingly, as is the case with the ATSC (Advanced Television Systems Committee) 65 standard, digital channel numbers often use a two-part format. For example, a digital channel number may be “9-2,” which refers to the second subchannel of channel nine. However, the ANSI/SCTE (American National Standards Institute/Society of Cable Telecommunications Engineers) 65 standard differs from the ATSC 65 standard in its specification of virtual channel numbers. For example, the ANSI/SCTE 65 standard adds the possibility of a one-part virtual channel number. As appreciated by those of ordinary skill in the art, conflicts may arise between channels because of the use of potentially conflicting channel assignment strategies. A system and method that effectively resolves conflicts between channels is desirable. 
       SUMMARY OF THE INVENTION 
       [0006]    Certain aspects commensurate in scope with the disclosed embodiments are set forth below. It should be understood that these aspects are presented merely to provide the reader with a brief summary of certain forms the invention might take and that these aspects are not intended to limit the scope of the invention. Indeed, the invention may encompass a variety of aspects that may not be set forth below. 
         [0007]    There is provided a system and method for accommodation of digital and analog channel number conflicts. More specifically, in one embodiment, there is provided a method, comprising detecting an analog video signal with a channel number, detecting a digital video signal with the channel number, storing the analog video signal in a channel database with a first reference value, and storing the digital video signal in the channel database with a second reference value, the second reference value being different from the first reference value. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0008]    Advantages of the invention may become apparent upon reading the following detailed description and upon reference to the drawings in which: 
           [0009]      FIG. 1  is a block diagram of an electronic device in accordance with an exemplary embodiment of the present invention; 
           [0010]      FIG. 2  is a process flow diagram representing cable channel map processing in accordance with an exemplary embodiment of the present invention; 
           [0011]      FIG. 3  is a process flow diagram representing a procedure for accommodating potential channel number conflicts in accordance with an exemplary embodiment of the present invention; 
           [0012]      FIG. 4  is a process flow diagram representing another procedure for accommodating potential channel number conflicts in accordance with an exemplary embodiment of the present invention; 
           [0013]      FIG. 5  is a process flow diagram representing another procedure for accommodating potential channel number conflicts in accordance with an exemplary embodiment of the present invention; 
           [0014]      FIG. 6  is a process flow diagram representing another procedure for accommodating potential channel number conflicts in accordance with an exemplary embodiment of the present invention; 
           [0015]      FIG. 7  is a process flow diagram representing another procedure for accommodating potential channel number conflicts in accordance with an exemplary embodiment of the present invention; and 
           [0016]      FIG. 8  is a process flow diagram representing a procedure for selecting channels when both digital and analog channels with the same value are present in a channel map in accordance with an exemplary embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION 
       [0017]    One or more specific embodiments of the present invention will be described below. In an effort to provide a concise description of these embodiments, not all features of an actual implementation are described in the specification. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers&#39; specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure. 
         [0018]      FIG. 1  is a block diagram of an electronic device in accordance with an exemplary embodiment of the present invention. The electronic device (e.g., a television) is generally referred to by the reference number  100 . The electronic device  100  comprises a receptor (e.g., a cable inlet or an antenna), a tuner  104 , a processor  106 , a memory  108 , and a display  110 . The memory  108  may be adapted to hold machine-readable computer code that causes the processor  106  to perform an exemplary method in accordance with the present invention. 
         [0019]      FIG. 2  is a process flow diagram  200  representing cable channel map processing in accordance with an exemplary embodiment of the present invention. Specifically,  FIG. 2  illustrates a cable channel map  202  that may be processed in block  204  by a channel map processing unit and added to a channel map database  206  stored in random access memory (RAM), non-volatile memory (NVM) or the like. For example, mapping channels (e.g., video signals) and storing them in memory may include searching available channels and mapping those with a sufficiently clear signal. Further, block  208  represents selection of channels for display by a user. For example, this may include selecting certain channel numbers on a television panel or remote control for display of the associated content on a television screen. 
         [0020]    Many televisions are configured to perform a channel search operation to identify valid channels when the television is initially set up or when a program source is changed. Such a search operation generally detects channels that carry a valid program signal. If a signal is present during the search operation, the channel is added or mapped to the channel database stored in non-volatile memory. After the search operation is performed, channels identified as not having valid program signals are essentially ignored and not shown during typical operation of the television. Moreover, such channels with no valid signal are typically skipped when the user presses the “channel up” or “channel down” button on the television controls. 
         [0021]    A channel search operation may identify both analog and digital cable channels that are available to a television. In view of the possibility of a one-part virtual channel number for a digital channel, it is now recognized that the potential exists for a search operation to identify multiple valid program signals with the same channel number. In other words, a valid digital channel and a valid analog channel may have the same channel number. Indeed, it is theoretically possible for a broadcaster to choose a one-part channel number (virtual channel) for a digital channel such that the selected channel number conflicts with an existing analog channel number. Accordingly, embodiments of the present invention address such potential conflicts and employ procedures to avoid conflicts and/or provide access to all available channels. 
         [0022]      FIG. 3  is a block diagram representing a procedure for accommodating potential channel number conflicts in accordance with an exemplary embodiment of the present invention. The procedure may generally be referred to by reference numeral  300 . According to procedure  300 , in the event that analog and digital channel numbers are in conflict, only the last number detected is selected for commitment to a channel map (e.g., a database store in the memory  108 ). For example, if a digital channel is detected and then an analog channel is detected with the same number as the digital channel, the analog channel will overwrite the digital channel because the analog channel was detected last. If the digital channel were detected last, it would overwrite the analog channel. 
         [0023]    Specifically, procedure  300  includes detecting a channel, as represented by block  302 . This may consist of detecting a valid analog or digital channel (e.g., a channel with valid programming or with a signal that is sufficiently clear for viewing) in a sequence or group of available channels. If a valid channel is detected, the channel may be included in a database of channels, as represented by block  304 . After each channel is detected and/or included in the channel map, it is determined in block  306  whether the most recently detected channel is the last channel to be included. For example, it may be the last channel to be searched in a range of channels. If it is not the last channel, the procedure may continue at block  302 . If it is determined to be the last channel, the database of valid channels or channel map may be committed to memory in block  308 . 
         [0024]      FIG. 4  is a block diagram representing another procedure for accommodating potential channel number conflicts in accordance with an exemplary embodiment of the present invention. The procedure may generally be referred to by reference numeral  400 . According to procedure  400 , in the event that analog and digital channel numbers are in conflict, only the first number detected is selected for commitment to a channel map (e.g., a database store in the memory  108 ). For example, if a digital channel is detected and then an analog channel is detected with the same number as the digital channel, the digital channel will be retained for inclusion in the channel map and the analog channel will be essentially ignored because it was detected after the digital channel. If the digital channel were detected last, it would be ignored and the analog channel would be retained. 
         [0025]    Specifically, procedure  400  includes detecting a channel, as represented by block  402 . This may consist of detecting a valid analog or digital channel in a sequence or group of available channels. If a valid channel is detected, it is determined whether the channel number is already present in a database of channels, as represented by block  404 . If it is already present, the procedure  400  continues without storing the recently detected channel. If the detected channel is not already present in the database, it is included therein, as represented by block  406 . After each channel is detected and/or included in the channel map, it is determined in block  408  whether the most recently detected channel is the last channel to be included. For example, it may be the last channel to be searched in a range of channels. If it is not the last channel, the procedure may continue at block  402 . If it is determined to be the last channel, the database of valid channels or channel map may be committed to memory in block  410 . 
         [0026]      FIG. 5  is a block diagram representing another procedure for accommodating potential channel number conflicts in accordance with an exemplary embodiment of the present invention. The procedure may generally be referred to by reference numeral  500 . According to procedure  500 , in the event that analog and digital channel numbers are in conflict, only the digital number or only the analog number is selected for commitment to a channel map (e.g., a database store in the memory  108 ) based on a preference. For example, when digital channels are the preference, if both a digital channel and an analog channel are detected with the same number, the digital channel will be retained for inclusion in the channel map because it is preferred. The analog channel will either be ignored or overwritten by the digital channel. If analog channels are preferred, the opposite will occur. 
         [0027]    Specifically, procedure  500  includes detecting a channel, as represented by block  502 . This may consist of detecting a valid analog or digital channel in a sequence or group of available channels. If a valid channel is detected, it is determined whether the channel number is already present in a database of channels, as represented by block  504 . If the detected channel is not already present in the database, it is included therein, as represented by block  506 . If it is already present, the procedure  500  continues to a preference query represented by block  508 . In block  508  it is determined whether the detected channel is the preferred channel type (i.e., digital or analog). If the detected channel is the preferred type, it overwrites the existing channel, as illustrated by block  510 . Otherwise, the procedure continues without storing the recently detected channel. After each channel is detected and/or included in the channel map, it is determined in block  512  whether the most recently detected channel is the last channel to be included. For example, it may be the last channel to be searched in a range of channels. If it is not the last channel, the procedure may continue at block  502 . If it is determined to be the last channel, the database of valid channels or channel map may be committed to memory in block  514 . 
         [0028]      FIG. 6  is a block diagram representing another procedure for accommodating potential channel number conflicts in accordance with an exemplary embodiment of the present invention. The procedure may generally be referred to by reference numeral  600 . According to procedure  600 , in the event that analog and digital channel numbers are in conflict, the digital channel number (virtual channel) is converted to a physical channel number. For example, if both a digital channel and an analog channel are detected with the same number (i.e., the virtual digital channel number is the same as a detected analog channel number), the digital channel number will be converted to a physical channel number. Specifically, for example, a virtual channel (e.g., “9”) assigned to the digital channel may be converted to a two part physical channel number (e.g., “48-2”) based on the physical channel and subchannel for the digital channel. Thus, conflict between equivalent channel values may be avoided. Further, both the analog and digital channel numbers may be mapped and may remain available for selection by a user. 
         [0029]    Specifically, procedure  600  includes detecting a channel, as represented by block  602 . This may consist of detecting a valid analog or digital channel in a sequence or group of available channels. If a valid channel is detected, it is determined whether the channel number is already present in a database of channels, as represented by block  604 . If the detected channel is not already present in the database, it is included therein, as represented by block  606 . If it is already present in the database, the procedure  600  continues to a data type query represented by block  608 . In block  608  it is determined whether the detected channel is digital or analog. If the detected channel is digital, it is converted to the corresponding physical channel number and then stored in the database, as illustrated by block  610 . If the detected channel is analog (e.g., not digital), the procedure continues to block  612 , wherein the previously stored digital number is converted to the corresponding physical channel number and the detected analog channel is also stored in the database. After each channel is detected, converted, and/or included in the channel map, it is determined in block  614  whether the most recently detected channel is the last channel to be included. For example, it may be the last channel to be searched in a range of channels. If it is not the last channel, the procedure may continue at block  602 . If it is determined to be the last channel, the database of valid channels or channel map may be committed to memory in block  616 . 
         [0030]      FIG. 7  is a block diagram representing another procedure for accommodating potential channel number conflicts in accordance with an exemplary embodiment of the present invention. The procedure may generally be referred to by reference numeral  700 . According to procedure  700 , in the event that analog and digital channel numbers are in conflict, the digital channel number and the analog number are both retained and committed to a channel map. Specifically, procedure  700  includes detecting a channel, as represented by block  702 . If a valid channel is detected, it is determined whether the channel number of that channel type is already present in a database of channels, as represented by block  704 . If the detected channel of its type is not already present in the database, it is included therein, as represented by block  706 . Block  706  may include assigning the channel to a different reference value to distinguish channel types. If the detected channel (type and number) is already present in the database, the procedure  700  continues to block  708  to determine whether the most recently detected channel is the last channel to be included. If it is not the last channel, the procedure may continue at block  702 . If it is determined to be the last channel, the database of valid channels or channel map may be committed to memory in block  710 . Because both analog and digital numbers are retained, the channels may later be distinguished by manner of selection, as illustrated in  FIG. 8 . 
         [0031]      FIG. 8  is a block diagram representing a procedure for selecting channels when both digital and analog channels with the same value are present in a channel map in accordance with an exemplary embodiment of the present invention. The procedure may generally be referred to by reference numeral  800  and may compliment other procedures set forth above, such as procedure  600  and procedure  700 . Procedure  800  includes channel selection, as represented by block  802 . For example, procedure  800  may be implemented with electronic device  100  to view a specific broadcast on electronic device  100 . Once a channel number is entered in block  802 , it is determined in block  804  whether the channel is present in a channel database. If the channel is not present in the database, the procedure may be directed to the physical frequency corresponding to the entered channel, as represented by block  806 . If the channel number is present in the database, the procedure  800  may continue to an analog and digital query, as represented by block  808 . In block  808 , it is determined whether both analog and digital channels with the same channel number are present in the database. If both types of the entered channel are not present, the found channel may be tuned, as represented by block  810 . If both types of the entered channel are present, a preference channel type is determined in block  812 . If digital is preferred, the digital channel is tuned, as represented by block  814 . If analog is preferred, the analog channel is tuned, as represented by block  816 . 
         [0032]    Procedure  800  also includes features that facilitate access to the non-preferred channel type that is stored. For example, once the preferred channel is tuned (e.g., blocks  814  and  816 ), a user may access the non-preferred channel by channeling up or down (e.g., pressing an up or down button) using a remote control or control panel on the electronic device  100 . One embodiment of this procedure is incorporated in the procedure  800 , as illustrated. For example, once the preferred digital channel is tuned in block  814 , a channel up may be detected in block  818 . If a channel up is detected, the corresponding analog channel may be tuned, as illustrated in block  820 . Once the analog channel is tuned in block  820 , the digital channel may be tuned again in block  814  if a channel down is detected in block  822 . If a channel up is detected in block  822 , a higher channel may be tuned in block  824 . If a channel down is detected while tuned to the digital channel in block  814 , the next lower channel may be tuned, as illustrated by block  826 . Similarly, once the preferred analog channel is tuned in block  816 , a channel up may be detected in block  828 . If a channel up is detected, the corresponding digital channel may be tuned, as illustrated in block  830 . Once the digital channel is tuned in block  830 , the analog channel may be tuned again in block  816  if a channel down is detected in block  832 . If a channel up is detected in block  832 , a higher channel may be tuned in block  824 . If a channel down is detected while tuned to the analog channel in block  816 , the next lower channel may be tuned, as illustrated by block  826 . It should be noted that in other embodiments, the up and down channel conventions may be reversed. 
         [0033]    While the invention may be susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and will be described in detail herein. However, it should be understood that the invention is not intended to be limited to the particular forms disclosed. Rather, the invention is to cover all modifications, equivalents and alternatives falling within the spirit and scope of the invention as defined by the following appended claims.
There is provided a system and method for accommodation of digital and analog channel number conflicts. More specifically, in one embodiment, there is provided a method, comprising detecting an analog video signal with a channel number, detecting a digital video signal with the channel number, storing the analog video signal in a channel database with a first reference value, and storing the digital video signal in the channel database with a second reference value, the second reference value being different from the first reference value.