ROBUST TWO MICROPHONE NOISE SUPPRESSION SYSTEM Russian patent published in 2013 - IPC H04B1/10 

FIELD: radio engineering, communication.

SUBSTANCE: separation process may include directional filtering, blind source separation and dual input spectral subtraction noise suppressor. The input channels may include two omnidirectional microphones whose output is processed using phase delay filtering to form speech and noise beam forms. Furthermore, the beam forms may be frequency corrected. The omnidirectional microphones generate one channel which is substantially only noise, and another channel which is a combination of noise and speech. A blind source separation algorithm augments the directional separation through statistical techniques. The noise signal and speech signal are then used to set process characteristics at a dual input noise spectral subtraction suppressor (DINS) to efficiently reduce or eliminate the noise component. In this way, noise is effectively removed from the composite signal to generate a good quality speech signal.

EFFECT: efficient suppression of noise sources irrespective of their time characteristics, location or movement.

37 cl, 8 dwg