Patent ID: 9368112
Filing Date: 2016-06-14
CPC Classification: G10L,H05K

Claim Text:
1. A method for detecting a voice activity in an input audio signal within a communication system, wherein the input audio signal is composed of frames, the method comprising: receiving the input audio signal; determining a noise characteristic of the input audio signal based on the received frames of the input audio signal; dividing each of the received frames of the input audio signal into one or more frequency sub-bands; obtaining a signal to noise ratio for each of the sub-bands; calculating a sub-band specific parameter (sbsp) of each sub-band based on the signal to noise ratio of the sub-band using an adaptive function, wherein at least one parameter of the adaptive function is selected depending on the noise characteristic of the input audio signal; deriving a modified segmental signal to noise ratio (mssnr) as a voice activity detection (VAD) parameter by adding the calculated sub-band specific parameter (sbsp) of each sub-band; comparing the derived VAD parameter with a threshold value to provide a voice activity detection decision (VADD) to an audio signal processing unit; and encoding the input audio signal by the audio signal processing unit within the communication network based on the VADD; wherein the modified signal to noise ratio (mssnr) is calculated by adding the sub-band specific parameter (sbsp) of each sub-band as follows: wherein N is the number of frequency sub-bands into which the input frame is divided, sbsp(i) is the sub-band specific parameter of the i wherein the sub-band specific parameter of the i wherein snr(i) is the signal to noise ratio of the i