Patent ID: 7489784

Claim:
An automatic sound field correcting device which executes a signal processing to an audio signal on a signal transmission path to output a processed audio signal to a correspondent speaker, comprising: a frequency characteristics correcting unit which corrects a frequency characteristic of an audio signal on the signal transmission path; a measurement signal supplying unit which supplies a measurement signal to the signal transmission path; a measurement sound output unit which outputs a measurement sound corresponding to the measurement signal from the speaker to a sound space; a detecting unit which outputs the measurement signal sound outputted from the speaker as a detecting signal; and a correction amount determining unit which determines a correction amount used for a correction of the frequency characteristic by the frequency characteristics correcting unit and supplies the correction amount to the frequency characteristics correcting unit, wherein the correction amount determining unit determines the correction amount based on the detecting signal at a first correction of the frequency characteristic, and determines the correction amount based on the detecting signal or an output signal of the frequency characteristics correcting unit at and after a second correction of the frequency characteristic.