Patent ID: 7158643
Filing Date: 2007-01-02
Classification: H04S

Abstract:
1. A method of auto-calibrating a surround sound system, comprising the acts of: producing an electric calibration signal, said calibration signal being a temporal maximum length sequence (MLS) signal, supplying said calibration signal to an electro-acoustic converter for converting the calibration signal to an acoustic response, transmitting the acoustic response as a sound wave in a listening environment to an acousto-electric converter for converting the acoustic response received by the acousto-electric converter to an electric response signal, correlating the electric response signal with the MLS signal to determine an impulse response, determining from the impulse response an anechoic portion of the impulse response between a time of flight signal and a first reflected signal, using the anechoic portion of the impulse response to compute filter coefficients, and processing the filter coefficients together with a predetermined channel response of the electro-acoustic converter to produce a substantially whitened system response.