1. A method for capturing user input on a computing device, comprising: receiving an electrical signal from a force sensitive sensor positioned on a case of the computing device; 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.
7. The method of claim 1 , wherein comparing the received electrical signal with a reference signal template, and determining whether the received electrical signal matches the reference signal template comprises: converting at least a portion of the received electrical signal into a frequency domain signal portion; calculating cross-correlation values of the frequency domain portion and each of a plurality of reference templates; determining a best correlation value; and determining whether the correlation value is above a threshold value.