Patent ID: 8712075

Claim:
A GSC-based spatially pre-processed target-to-jammer ratio weighted filter, comprising: at least two microphones receiving audio signals, said audio signals being transformed into a plurality of frequency bands; a beamformer and a reference generator respectively generating a beamformed signal and a reference signal for each frequency band in said plurality of frequency bands; a power spectral density estimator (PSD estimator) calculating a power spectral density as a function of said beamformed signal and said reference signal, and obtaining a target-to-jammer ratio according to said power spectral density; and a noise estimator determining whether at least one target sound source exists according to said target-to-jammer ratio; if at least one target sound source exists, switching said noise estimator to eliminate noise from said beamformed signal and obtaining an output signal; wherein said noise estimator further comprises a threshold calculation module calculating a ratio of mixing said beamformed signal and a new Wiener solution for estimating noise.