Patent ID: 7058187

Claim:
An automatic sound field correcting system in an audio system for supplying a plurality of input audio signals to a plurality of sound generating means via a plurality of signal transmission lines, each of the plurality of signal transmission lines including an equalizer for adjusting a frequency characteristic of the audio signal, a channel-to-channel level adjusting means for adjusting a level of the audio signal, and a delaying means for adjusting a delay time of the audio signal, so that the input audio signals are supplied to said sound generating means via said equalizers, said channel-to-channel level adjusting means, and said delaying means, said correcting system comprising: a noise generating means for supplying a noise to respective signal transmission lines independently in correcting a sound field; detecting means for detecting reproduced sounds of the noise reproduced by said sound generating means; frequency characteristic correcting means for correcting frequency characteristics of the equalizers based on detection results of said detecting means; channel-to-channel level correcting means for correcting an adjusted amount of said plurality of channel-to-channel level adjusting means based on the detection results of said detecting means, wherein the channel-to-channel level correcting means corrects the adjusted amount of said plurality of channel-to-channel level adjusting means based on one data of sound collecting data, said one data of the sound collecting data having a minimum value with respect to at least one other data of the sound collecting data; and phase characteristic correcting means for calculating phase characteristics of the reproduced sounds reproduced by said sound generating means based on the detection results of said detecting means and also correcting delay times of said delaying means based on calculated phase characteristics, wherein a size of said sound generating means is determined by comparing gain data with a threshold.