Patent ID: 8194872

Claim:
A noise reduction signal processing system comprising: multiple microphone signal inputs; time delay compensation logic coupled to the microphone signal inputs and comprising time delay compensated microphone signal outputs; adaptive self-calibration logic coupled to the time delay compensation logic, the adaptive self-calibration logic operable to match the phase of time delay compensated microphone signals provided on the time delay compensated microphone signal outputs; noise reference logic coupled to the adaptive self-calibration logic and comprising noise reference signal outputs; an adaptive beamformer coupled to the adaptive self-calibration logic and comprising a beamformed signal output, the adaptive beamformer generating a beamformed signal on the beamformed signal output using time-dependent adapted weights; and adaptive noise cancellation logic coupled to the noise reference signal outputs and operable to generate a noise estimate for removing noise from the beamformed signal by subtracting the noise estimate from the beamformed signal, to produce a complex-valued low noise output signal.