Particular signal cancel method, particular signal cancel device, adaptive filter coefficient update method, adaptive filter coefficient update device, and computer program

摘要

By using the adaptive filter, the reference input signal is processed so as to identify a pseudo-signal of a particular signal to be deleted. The pseudo-signal is subtracted from the mixture containing a target signal inputted from a microphone, the particular signal to be deleted, and a noise so as to obtain an error signal. A stationary noise is estimated to obtain a stationary noise estimated value. A non-stationary noise is estimated to obtain a non-stationary noise estimated value. The stationary noise estimated value is mixed with the non-stationary estimated value to obtain a mixed noise estimated value. An update amount is calculated according to a correlation value between the error signal and the reference input signal, and the mixed noise estimated value. According to the update amount, a coefficient of the adaptive filter is updated.

主权项

1. A particular signal erase method, comprising:
(a) a process of processing a reference input signal with an adaptive filter and obtaining a pseudo signal of a particular signal that should be erased; (b) a process of subtracting the above pseudo signal from a mixture containing an inputted target signal, the particular signal that should be erased, and a stationary noise as well as a non-stationary noise, and obtaining an error signal; (c) a process of estimating a stationary noise from said error signal and obtaining a stationary noise estimated value; (d) a process of estimating a non-stationary noise from said error signal and obtaining a non-stationary noise estimated value; (e) a process of mixing said stationary noise estimated value and said non-stationary noise estimated value and obtaining a mixed noise estimated value; and (f) a process of obtaining a correlation value between said error signal and said reference input signal, and calculating an update amount for adaptive filter coefficients based on said correlation value and said mixed noise estimate value such that said correlation value is multiplied by a value between 0 and 1 based on said mixed noise estimated value.