Patent ID: 8908881

Claim:
A sound signal processing device comprising: a dividing device that divides each of two signals that have temporal relation in their entirety or in part, into a plurality of frequency bands, one of the two signals being a mixed sound signal and the other of the two signals being a target sound signal, the mixed sound signal being a signal in the time domain of mixed sound including first sound and second sound, and the target sound signal being a signal in the time domain of sound including sound corresponding to at least the second sound; a level ratio calculating device that calculates a level ratio of the two signals for each frequency band of the plurality of frequency bands; a judging device that judges whether or not the level ratio calculated by the level ratio calculating device for each frequency band is within a pre-set range, where the pre-set range of level ratios for each frequency band corresponds to the first sound; an extracting device that extracts, from the mixed sound signal, a signal in each frequency band having the level ratio that is judged by the judging device to be in the pre-set range; an output signal generation device that converts the signal extracted by the extracting device to a signal in the time domain as an output signal; an output device that outputs the output signal in the time domain; a first input device that inputs a signal in the time domain of mixed sound including first sound outputted from a first output source and second sound outputted from at least one second output source, as the mixed sound signal; a second input device that inputs a signal in the time domain of the second sound outputted from the at least one second output source, as the target sound signal; and an adjusting device that provides an adjusted signal by delaying one of the mixed sound signal and the target sound signal on a time axis by an adjustment amount according to a time difference between a signal of the second sound in the mixed sound signal and a signal of the second sound in the target sound signal; wherein the dividing device divides the adjusted signal obtained by the adjusting device and an original signal from among the mixed sound signal or the target sound signal which is not adjusted by the adjusting device, into a plurality of frequency bands, respectively; and wherein the adjusting device provides the adjusted signal by using, as adjustment amounts, a number of delay times corresponding to the number of the second output sources, where each delay time is a time for adjusting the time difference generated according to a characteristic of a sound field space between each of the second output sources to a sound collecting device that collects the mixed sound, adjusting the mixed sound signal or the target sound signal on the time axis for each of the adjustment amounts, multiplying the mixed sound signal or the target sound signal adjusted by a coefficient set for each of the adjustment amounts to obtain adjusted signals, and adding the adjusted signals together.