Patent ID: 8031876
Filing Date: 2011-10-04
Classification: H04S

Abstract:
1. An audio system including a group of loudspeakers that form a sound field by delivering into a single space sound signals passed through respective ones of a plurality of sound signal channels, the audio system comprising: two characteristic-variable equalizers cascaded to each other to constitute a part of the sound signal channels; a sound field characteristics detecting part for supplying test signals through the sound signal channels and detecting sound pressure in the sound field and thereby obtaining a sound pressure signal; and a characteristics adjusting part for adjusting, based on the sound pressure signal, equalizing characteristics of the characteristic-variable equalizers individually and with respect to each of the sound signal channels, wherein the sound field characteristics detecting part generates a test signal having low frequencies within an audible frequency band, and then, a test signal having entire frequency band within the audible frequency band, wherein the characteristics adjusting part adjusts equalizing characteristics of the upstream side equalizer out of the two characteristic-variable equalizers for all of the sound signal channels when the test signal generated by the sound field characteristics detecting part is a low-frequency signal, and then, equalizing characteristics of the downstream side equalizer out of the two characteristic-variable equalizers for all of the sound signal channels when the test signal generated by the sound field characteristics detecting part is an entire range frequency signal.