In this paper we discuss what filter-bank structure is advantageous to separate time-varying harmonic sounds having random amplitude/pitch fluctuations from background noise. The answer is to employ the constant-BW(-bandwidth)/constant-Q-type comb filter which is derived from the Wiener filter analysis to a time-varying harmonics model. It is shown that the frequency response is well fitted to the filter-bank structure built in our auditory system.
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