This paper proposes a method of extracting the desired signal from a
noisy signal. This method solves the problem of segregating two acoustic
sources by using constraints related to the four regularities proposed
by Bregman and by making two improvements to our previously proposed
method. One is to incorporate a method of estimating the fundamental
frequency using the Comb filtering on the filterbank. The other is to
reconsider the constraints on the separation block, which constrain the
instantaneous amplitude, input phase, and fundamental frequency of the
desired signal. Simulations performed to segregate a vowel from a noisy
vowel and to compare the results of using all or only some constraints
showed that our improved method can segregate real speech precisely
using all the constraints related to the four regularities and that the
absence some constraints reduces the accuracy.
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