Patent ID: 7680286
Filing Date: 2010-03-16
Classification: H04R,H04S

Abstract:
1. A sound field measurement device, comprising: a test sound source configured to generate a wide frequency range signal including an audio signal and a test signal; a plurality of speakers configured to reproduce the audio signal and the test signal included in the wide frequency range signal to output an audio sound and a test sound respectively; a plurality of microphones configured to detect the test sound when the test sound is outputted from one of said plurality of speakers; a measurement section configured to determine a number and positions of people present in a sound field, based on test sound detected by said plurality of microphones; and a directionality controller configured to change a directionality of said plurality of microphones toward a position of the one speaker, outputting the test sound, of the plurality of speakers, wherein the test sound source outputs at least a high frequency range signal included in a range from 1 kHz to 10 kHz where the presence or absence of people has a significant influence and a low frequency range signal included in a range from 80 Hz to 800 Hz where the presence or absence of people does not have a substantial influence in a time division manner or at least a wide frequency range signal which includes both the high frequency range signal and the low frequency range signal; and the measurement section includes: