18. A computing device, comprising: a case; a processor positioned within the case; a memory coupled to the processor, the memory storing a reference signal template; and a force sensitive sensor positioned on the case and coupled to the processor, wherein the processor is configured with processor-executable instructions to perform operations comprising: receiving an electrical signal from the force sensitive sensor; comparing the received electrical signal to each of a plurality of reference signal templates; calculating cross-correlation values of the received electrical signal and each of the plurality of reference signal templates; determining a best match reference signal template for the received electrical signal based on the cross-correlation values; identifying a functionality associated with the best match reference signal template; and implementing the identified functionality on the computing device.
18. A computing device, comprising: a case; a processor positioned within the case; a memory coupled to the processor, the memory storing a reference signal template; and a force sensitive sensor positioned on the case and coupled to the processor, wherein the processor is configured with processor-executable instructions to perform operations comprising: receiving an electrical signal from the force sensitive sensor; comparing the received electrical signal to each of a plurality of reference signal templates; calculating cross-correlation values of the received electrical signal and each of the plurality of reference signal templates; determining a best match reference signal template for the received electrical signal based on the cross-correlation values; identifying a functionality associated with the best match reference signal template; and implementing the identified functionality on the computing device. 29. The computing device of claim 18 , wherein the processor is configured with processor-executable instructions to perform operations further comprising: receiving a user identified functionality to be associated with a user input gesture; prompting the user to perform the user input gesture; receiving electrical signals from the force sensitive sensor; processing the received electrical signals from the force sensitive sensor in order to generate a user-generated reference signal template; and storing the user-generated reference signal template in the memory in conjunction with the received user identified functionality.