Patent ID: 7302066

Claim:
A method for eliminating or reducing an unwanted signal from a recorded mixture of a desired signal and an unwanted signal given a recording of the unwanted signal without the desired signal, comprising: aligning the recorded mixture and the recording of the unwanted signal without the desired signal; computing a time-frequency representation of the recorded mixture to create a time-frequency recorded mixture; computing a time-frequency representation of the redefined recording of the unwanted signal to create a time-frequency redefined recording of the unwanted signal; determining a segment of time when only the redefined recording of the unwanted signal is present in the recorded mixture; computing a value α(ω), wherein α(ω) is a modulus of a Widrow-Hoff estimate; generating a time-frequency mask using the value α(ω), the time-frequency recorded mixture and the time-frequency redefined recording of the unwanted signal; applying the time-frequency mask on the recorded mixture to compute a time-frequency desired signal; and inverting the time-frequency desired signal to create a desired signal.