Patent ID: 7386109
Filing Date: 2008-06-10
Classification: H04R

Abstract:
1. A communication apparatus comprising: a speaker, at least one pair of microphones having directivity and arranged on a straight line straddling a center axis of the speaker arranged around the center axis of said speaker radially at equal angles and at equal distances from the speaker, an amplifying means for independently amplifying sound picked up by the microphones and able to adjust gain, a level detecting means for calculating an absolute value of a difference of signals of a pair of microphones, among output signals of the amplifying means, and holding a peak value of the calculated absolute values, a test signal generating means outputting a pink noise signal to the speaker, and a level judging/gain controlling means adjusting the gain of the amplifying means so that the difference of signals of the pair of microphones detected by the level detecting means becomes within a predetermined sensitivity difference adjustment error when the microphones detect the speaker outputting a sound in accordance with the pink noise.