Abstract
(57) (Summary) Speech is distinguished from noise by spectral comparison (114, 115) between the stored noise estimation value (113) and the input signal. Updates to the noise estimate (in the buffer (113)) are allowed under the control of the auxiliary detector (200) during periods of no speech. To improve performance in the presence of signals with strong harmonic components (eg signaling tones), the LPC prediction gain is a complementary response to the input (x (i)) and the input frequency spectrum. It is calculated from the residual (y (i)) obtained from the input after being filtered by the filter (115) having Then, when the gain exceeds the threshold value, the buffer update is suppressed.
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