Electrical audio signal processing systems and devices – Noise or distortion suppression – Spectral adjustment
Patent
1997-06-16
1999-05-25
Chang, Vivian
Electrical audio signal processing systems and devices
Noise or distortion suppression
Spectral adjustment
704226, H04B 1500
Patent
active
059076240
ABSTRACT:
A noise canceler of the present invention switches its noise canceling characteristic on detecting narrow band noise, and thereby executes noise cancellation adequately despite narrow band noise. Further, the noise canceler selects an output signal having a particular noise canceling characteristic, depending on whether or not a speech signal contained in an input acoustic signal is voiced. In addition, the noise canceler adaptively changes, for an acoustic signal containing voiced sound, a window function which regulates the depth of a valley of an attenuation characteristic meant for the acoustic signal. Therefore, the noise canceler improves an output signal with respect to the auditory sense and sound quality without regard to narrow band noise.
REFERENCES:
patent: 5727072 (1998-03-01), Raman
patent: 5757937 (1998-05-01), Itoh et al.
patent: 5793863 (1998-08-01), Hashimoto
Masanori Akita et al., "A Method of Revising Spectral Envelopes Under the Noisy Environment for Speech Processing", Technical Report of IEICE, pp. 1-8, Nov. 1995.
Chang Vivian
Frank Robert J.
OKI Electric Industry Co., Ltd.
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