SOUND EMISSION AND COLLECTION DEVICE

摘要

A sound emitting and collecting apparatus that can precisely detect the talker direction based on a collected sound signal even when a sound is emitted from a loudspeaker is provided. Microphone units MU1 to MU8 collect a sound in sound collecting areas MA1 to MA8 formed so as to have rotational symmetry with the placement position of loudspeakers SP1 and SP2 as the center and generates composite signals SA1 to SA8 (hereinafter, SAk). Logarithm calculation sections L1 to L8 calculate logarithm values P k of power level of the composite signals SAk. An amplification section 11 calculates a power level average value AV from the logarithm values P k of power levels and a subtraction section subtracts the power level average value AV from the logarithm values P k of power level to generate differential signal levels D k . A maximum value detection section 12 compares differential signal levels D k and detects the maximum value. A control section 20 detects the direction of the sound collecting area corresponding to the differential signal level D kM indicating the maximum value as the talker direction.