Patent ID: 7054448

Claim:
An automatic sound field correcting device for applying signal processing onto audio signals of plural channels and outputting processed audio signals to corresponding plural speakers, comprising: a noise measuring unit for measuring environmental noise level; a signal level determining unit for determining a measurement signal level based on the environmental noise level; and a correcting unit for outputting a measurement signal having the determined measurement signal level to perform automatic sound field correction, wherein the environmental noise is sound in an acoustic space when the correcting unit does not output the measurement signal, wherein the signal level determining unit comprises: a calculating unit for calculating a necessary signal level necessary to obtain predetermined necessary S/N level under the measured environmental noise level; a measuring unit for measuring a microphone input level at a time when a signal output from the speaker is input to a microphone; and a setting unit for setting the microphone input level to the measurement signal level when the microphone input level is larger than the necessary signal level.