Dual-Channel Speech Enhancement Using a Perceptual Filterbank for Hands-Free Communication - Digital Signal Processing for In-Vehicle Systems and Safety - page 180

Fig. 12.2 Schematic diagram of PANS based on TFGSC

Fig. 12.3 Frequency response of an ERB filterbank [ 10 ]

is a parameter to control the noise suppression, and the power ratio x

where a is

N

= Y . Since the SE samples only appear at center frequencies of the
filterbank, the function F itp is used to interpolate the power ratio samples x

defined by

in the
frequency domain. With the auditory filterbank and spectral modification, the
proposed structure has the improved perceptual quality of an enhanced speech
while minimizing the number of coefficients in the adaptive filter. Moreover, the
system also promises to have the robustness against the in-vehicle ambient noise.
This is based on the fact that the adaptive filter provides an SE estimate including
overall noise components.