Patent ID: 8352274

Claim:
A sound determination device, comprising: a frequency analysis unit configured to receive a mixed sound including a to-be-extracted sound and a noise, and to obtain a frequency signal of the mixed sound at each of a plurality of time slices of the mixed sound over a predetermined duration; and a to-be-extracted sound determination unit configured to determine, when the number of the frequency signals of the plurality of time slices is equal to or larger than a first threshold value and when a phase distance between the frequency signals of the plurality of time slices is equal to or smaller than a second threshold value, each of the frequency signals with the phase distance as a frequency signal of the to-be-extracted sound, wherein the phase distance is a distance between phases of the frequency signals of the plurality of time slices when a phase of a frequency signal at a time t is ψ(t) (radian) and the phase is represented by ψ′(t)=mod 2π(ψ(t)−2πft) (where f is an analysis-target frequency).