The effect of modified filter distribution on an adaptive, sub-band speech enhancement method

An adaptive noise cancellation scheme for speech processing is described, in which adaptive filters operate in frequency-limited sub-bands. Previously the filters had been distributed in a linear fashion in the frequency domain. This work investigates the effects of spacing the filters more in sympathy with the signal power and spectral characteristics. It is found that improvements in signal-to-noise ratio of processed noisy speech signals may be obtained in certain cases when the sub-bands are spaced according to a published cochlear function.