Patent ID: 7171009

Claim:
A sound field correcting method in an audio system which includes a plurality of variable gain type frequency discriminating means for discriminating input audio signals into a plurality of frequencies, and delaying means for adjusting delay times of the audio signals that are frequency-discriminated by the variable gain type frequency discriminating means, whereby the audio signals are supplied to sound generating means via the variable gain type frequency discriminating means and the delaying means, said method comprising: a first step of supplying a noise to the sound generating means via the variable gain type frequency discriminating means and the delaying means, and then detecting a first reproduced sound generated by the sound generating means; a second step of analyzing frequency characteristics of the first reproduced sound based on a first detection result detected by said first step in answer to the variable gain type frequency discriminating means; a third step of supplying the noise to the sound generating means via the plurality of variable gain type frequency discriminating means and the delaying means, and then detecting a second reproduced sound generated by the sound generating means; a fourth step of analyzing frequency characteristics of the second reproduced sound based on a second detection result detected by said third step and an analysis result obtained by said second step, wherein the frequency characteristics are analyzed using a value obtained by multiplying the first detection result by the second detection result; and a fifth step of adjusting frequency characteristics of the variable gain type frequency discriminating means based on the frequency characteristics obtained by said second step and the frequency characteristics obtained by said fourth step.