Patent ID: 8483396

Claim:
A method for sound processing of a stereophonic signal inside a motor vehicle, the stereophonic signal being composed of a left electric sound signal and a right electric sound signal, further comprising the steps of: delivering the left electric sound signal and the right electric sound signal by front left and right transducers; applying all-pass filters to the left or right electric sound signal, each all-pass filter having a cutoff frequency (fc) substantially equal to a middle frequency (f 1 , f 2 ) of a frequency band for which the left and right electric sound signals received are in phase opposition; recording a left channel signal emitted by the left transducer by a microphone at the location of a passenger's head; determining a left phase response (φL) of the received left channel signal indicating the variation in the phase of the received left channel signal as a function of a frequency of the received left channel signal; recording a right channel signal emitted by the right transducer by the microphone at the location of the passenger's head; determining a right phase response (φR) of the received right channel signal indicating the variation in the phase of the received right channel signal as a function of a frequency of the received right channel signal, calculating a phase difference (φL−φR) between the left and right channel signals received by the microphone; and modifying the phases of the left electric sound signal and the right electric sound signal so as to minimize the phase oppositions between the left channel signal received from the left transducer and the right channel signal received from the right transducer at the location of the passenger's head.