Patent ID: 8798993
Filing Date: 2014-08-05
Classification: G10L,H04R

Abstract:
1. A method for detecting speech using a first microphone adapted to produce a first signal (x), and a second microphone adapted to produce a second signal (x 2 ), the method comprising: providing a first microphone and a second microphone; applying gain to the second signal to produce a normalised second signal, which signal is normalised relative to the first signal; constructing one or more signal components from the first signal and the normalised second signal; constructing an adaptive differential microphone (ADM) having a constructed microphone response constructed from the one or more signal components which response has at least one directional null; producing one or more ADM outputs (y computing a ratio of a parameter of either one of the one or more signal components or the constructed microphone response to a parameter of an output of the ADM; comparing the ratio to an adaptive threshold value; detecting speech if the ratio is greater than or equal to the adaptive threshold value.