Patent ID: 7835529

Claim:
A system for sound cancellation comprising: a source microphone for detecting sound propagating from a mobile sound source remote from the source microphone; a source localizing sensor for determining a current location of the sound source; at least two speakers configured to direct a canceling sound toward a mobile cancellation location that is spatially remote from the sound source and the speakers, a cancellation space localizing sensor for determining a current location of the mobile cancellation space; and a computational module in communication with the source microphone, the source localizing sensor, the speakers, and the cancellation space localizing sensor, the computational module including a memory storing a situational transfer function of individual transfer functions, each individual transfer function corresponding to at least a sound source location and a cancellation space location, the computational module configured to receive a signal from the microphone, to identify at least one current individual transfer function corresponding to the current location of the sound source and the current location of the cancellation location, and to control the speakers to transmit a cancellation sound signal based on the at least one current individual transfer function to the speakers, wherein the situational transfer function includes a situational transfer matrix function, W, W= 1/( d−c*e ) wherein c is a transfer function for sound propagation from the sound source to the source microphone, e is a transfer function for sound propagation from the speaker to the cancellation location, and d is a transfer function for sound propagation from the source microphone to the speaker, and the * operator denotes mathematical convolution.