Abstract
A voice activity detector for detecting the presence of speech in an input signal comprises: (a) a store (113) for storing noise component data representing an estimate of the noise component of an input signal; (b) spectral similarity recognition means (102-105109-111113-115117) for recognizing the special similarity of the input signal and the estimated noise component represented by the noise component data to produce an output decision signal; (c) store updating means for updating the stored estimate; (d) an auxiliary detector (200) provided to control the store updating means so that updating occurs only when speech is indicated by the auxiliary detector to be absent from the input signal; (e) prediction gain parameter calculation means (102-106109400401) operable to calculate a prediction gain parameter for the input signal; and (f) modifying means (206403404405406) arranged to suppress updating in the event that the prediction gain exceeds a prediction gain threshold value.
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