Patent ID: 8953812
Filing Date: 2015-02-10
Classification: H04R

Abstract:
1. A method of improving signal quality in a voice communication system, the method comprising: a) receiving one or more buffers of sound samples from a first microphone and a second microphone, resulting in a first microphone signal and a second microphone signal; b) processing the first microphone signal and the second microphone signal to obtain a cardioid shape output signal; c) obtaining a first cardioid shape signal by subtracting a delayed second microphone signal from the first microphone signal, the delayed second microphone signal obtained from the second microphone; d) obtaining a second cardioid shape signal by subtracting the second microphone signal from a delayed first microphone signal, the delayed first microphone signal obtained from the first microphone; e) generating a first level output signal based on the first cardioid shape signal and adaptive weights output, the adaptive weights output being calculated based on the second cardioid shape signal; f) detecting at least one speech region and a non-speech region of the first level output signal; g) generating a second level output signal based on the second cardioid shape signal, and at least one of the speech regions and the non-speech regions of the first level output signal; and h) removing residuals of noise from the first level output signal based on the generated second level output signal.