Robust two microphone noise suppression system

A system for noise reduction, the system comprising:

• a plurality of omnidirectional microphones each receiving one or more acoustic signals;
• a first directional filter for producing a speech estimate signal from the received one or more acoustic signals;
• a second directional filter for producing a noise estimate signal from the received one or more acoustic signals;
• and
• at least one robust dual input spectral subtraction noise suppressor (RDINS) for producing a noise reduced speech signal from the produced speech estimate signal and the produced noise estimate signal.

An electronic device with noise reduction, comprising:

• a pair of omnidirectional microphones for receiving one or more acoustic signals;
• wherein the signal from the omnidirectional microphones are categorized as predominantly speech signal and predominantly noise signal;
• and
• at least one signal processor for processing the predominantly speech signal and the predominantly noise signal to produce noise suppressed speech signal comprising:
• at least one source filter to separate the one or more acoustic signals into speech and noise beams;
• at least one blind source separation (BSS) filter, wherein the blind source separation filter is operable to refine the speech and noise beams;
• at least one dual input spectral subtraction noise suppressor (DINS) to produce a speech signal that is substantially noise free by processing the refined speech beam and noise beam with one of the separated speech and noise beams from the at least one source filter.

A method for noise reduction, the method comprising:

• receiving one or more acoustic signals from a plurality of input channels;
• separating with a source filter the one or more acoustic signals received from the plurality of input channels into speech and noise beams, wherein the source filter comprises at least one hypercardioid directional filter to produce a speech beam from the received one or more acoustic signals;
• refining the speech and noise beams by employing at least one blind source separation (BSS) filter, wherein the blind source separation filter is operable to refine the speech and noise beams;
• and
• producing through at least one dual input spectral subtraction noise suppressor (DINS) a speech signal that is substantially noise free by processing the refined speech beam and noise beam with one of the separated speech and noise beams from the source filter.

A method for noise reduction, the method comprising:

• receiving one or more acoustic signals at a plurality of omnidirectional microphones;
• producing a speech estimate signal by use of a directional filter that produces a hypercardioid response from the one or more acoustic signals received at the plurality of omnidirectional microphones;
• producing a noise estimate signal from the hypercardioid response of the one or more acoustic signals received at the plurality of omnidirectional microphones;
• and
• producing a reduced noise speech signal from the speech estimate signal and the noise estimate signal by use of a robust dual input spectral subtraction noise suppressor (RDINS).