Patent ID: 7580530
Filing Date: 2009-08-25
Classification: H04R,H04S

Abstract:
1. An audio characteristic correction system for an audio surround system including an array speaker that reflects sound off a wall surface or a sound reflection board to create virtual surround sound, for correcting for audio characteristics of the wall surface or the sound reflection board, the audio characteristic correction system comprising: a sound pickup device for picking up sound from the array speaker that has been reflected off the wall surface or the sound reflection board; a character correction device for correcting, based on the sound picked up by the sound pickup device, at least one of frequency-gain characteristics or frequency-phase characteristics, of an audio signal input to the array speaker such that the sound reflected off the wall surface or the sound reflection board has desired audio characteristics at a desired listening position; and a characteristic correction control device that changes the directivity of the array speaker while the sound pickup device is picking up sound so that the sound pickup device picks up sound reflected off of different areas of the wall surface or the sound reflection board, wherein the array sneaker includes a delay circuit and a plurality of directional speakers arranged in an array, wherein the characteristic correction control device sends a plurality of prescribed directivity control coefficients to the delay circuit, wherein the delay circuit changes delay times applied to the audio signal supplied to the directional sneakers based on the directivity control coefficients to emit a plurality number of sounds each having a different focal position so that the plurality number of sounds reflect off of different areas of the wall surface or the sound reflection board, wherein the characteristic correction control device receives and stores measurement results based on the sounds picked up by the sound pickup device regarding characteristics of the plurality number of sounds in relation to the directivity control coefficients, and wherein the characteristic correction control device selects one of the plurality of directivity control coefficients based on the stored measurement results to control the directivity of the speakers.