Noise suppressor

摘要

Provided is a method, non-transitory computer program product and system for an improved noise suppression technique for speech enhancement. It operates on speech signals from a single source such as either the output from a single microphone or the reconstructed speech signal at the receiving end of a communication application. The system performs background noise monitoring of an in-coming speech signal and determines its level, and performs a time domain gain calculation. The noise suppressed output signal is the gain shaped original speech signal.

主权项

1. A method for improving the quality of a voice call over a communication link using a communication device, the communication device having a microphone for receiving a near-end voice signal and a near-end noise signal, the method comprising the steps of:
monitoring the noise signal to determine a noise level of a sample of the noise signal in a time domain; monitoring the voice signal to determine a signal level of said sample of the voice signal in said time domain; comparing said noise level to said signal level in said time domain to calculate a difference; assigning a noise confidence parameter, wherein said noise confidence parameter is low when said difference is high and said noise confidence parameter is high when said difference is low; calculating a gain factor, wherein said gain factor is close to 0 when said noise confidence parameter is above a first predetermined threshold and said gain factor is close to 1 when said noise confidence parameter is below a second predetermined threshold and said gain factor increases between 0 and 1 as said noise confidence parameter decreases between said first and second predetermined thresholds; and applying said gain factor to said voice signal to produce an enhanced speech signal; and outputting said enhanced speech signal.