Patent ID: 9736287
Date: 2017-08-15
CPC Classifications: H04B,H04M,H04R,H04W

Claim:
1. A method of switching between noise reduction modes in multi-microphone mobile devices, the method comprising: receiving a first sound signal at a first sound receiver; receiving a second sound signal at a second sound receiver; determining a first power value associated with the first sound signal comprising a power spectral density associated with the first sound signal; determining a second power value associated with the second sound signal comprising a power spectral density associated with the second sound signal; dividing the first sound signal into first discrete time frames; comparing the first power value to the second power value; and switching between a single-microphone noise reduction mode and a dual-microphone noise reduction mode based on the comparison; wherein the switching between the single-microphone noise reduction mode and the dual-microphone noise reduction mode is further based on a comparison of a number of consecutive first discrete time frames during which voice activity is not detected to a selected value, and wherein the power spectral density for each first and second sound signal is computed by a present frame's spectrum and a last frame's power spectral density.