Patent ID: 7286946

Claim:
A transfer characteristics measuring device for measuring transfer characteristics of each of n objects of measurement out of m objects of measurement, where n is less than or equal to m, using input signals being input to the m objects of measurement and output signals from the objects of measurement in an acoustic reproduction environment for m channels having mutually differentiated respective spatial positions, the device comprising: object of measurement selecting means for selecting an object of measurement out of the n objects of measurement according to levels of the input signals of the m channels being supplied to the m objects of measurement; and transfer characteristics computing and determining means for: computing the transfer characteristics of the object of measurement selected by the object of measurement selecting means according to an input signal being supplied to the object of measurement and an output signal of the object of measurement corresponding to the input signal, and determining adoption of the transfer characteristics of the object of measurement, excluding the object of measurement from the m objects of measurement, wherein: the transfer characteristics computing and determining means includes: orthogonal transformation means for performing an orthogonal transformation on the input signals supplied to the object of measurement selected by the object of measurement selecting means and on the output signals of the object of measurement corresponding to the input signals; power spectrum computing means for computing power spectrums of the input signals and power spectrums of the output signals, using spectrums of the input signals and spectrums of the output signals obtained by the orthogonal transformation means; cross spectrum computing means for multiplying a frequency component of the spectrum of each input signal by a frequency component of the spectrum of the corresponding output signal obtained by the orthogonal transformation means to computationally determine cross spectrums; spectrum average computing means for computing an average value of the power spectrums of the input signals, an average value of the power spectrums of the output signals, and an average value of the cross spectrums; transfer characteristics computing means for computing transfer characteristics of the object of measurement from the average values of the power spectrums and the average value of the cross spectrums; coherence computing means for computing a value of the coherence from the average value of the power spectrums of the input signals, the average value of the power spectrums of the output signals and the average value of the cross spectrums; and transfer characteristics determining means for determining adoption of the transfer characteristics of the object of measurement according to the coherence value and for excluding the object of measurement from the plurality of objects of measurement.