Patent ID: 8249269

Claim:
A sound collecting device used for an acoustic system which outputs signals corresponding to respective channels to a plurality of loudspeakers present at a different place from a place where the sound collecting device is present, via a communication network, the signals including a sound produced by a speaker and collected by using microphones, and which reproduces, by using a plurality of loudspeakers, signals of the respective channels inputted from the different place via the communication network, the sound collecting device comprising: a plurality of reference microphones fixedly placed so as to correspond to the respective channels, the plurality of reference microphones collecting an arriving sound produced by the speaker, and outputting reference signals representing signals of the respective channels; a plurality of actual recording microphones placed so as to be movable, the plurality of actual recording microphones collecting the arriving sound produced by the speaker, and outputting the collected sound as actual recording signals; coefficient calculation means for calculating, for each reference signal, coefficients by which the actual recording signals outputted by the plurality of actual recording microphones are to be multiplied so that the sum of the levels of the actual recording signals coincides with each of the levels of the reference signals outputted by the plurality of reference microphones; and signal generation means for generating signals of the respective channels by multiplying each of the actual recording signals outputted by the plurality of actual recording microphones by each of the coefficients calculated for the respective reference signals by the coefficient calculation means.