Noise suppression apparatus and method

Details Noise suppression apparatus and method Noise suppression apparatus and method

1995-09-29

1997-11-11

Isen, Forester W.

Electrical audio signal processing systems and devices

Noise or distortion suppression

Spectral adjustment

H04B 1500

Patent

active

056872437

ABSTRACT:
A signal that includes noise (301) is sampled to provide a plurality of digital information samples (303). A predetermined number of the digital information samples are grouped as a set (305). Noise suppression is performed on the signal using the following steps. One or more digital representations of silence is attached to the set, forming an extended set (401). A Fourier transform is performed on the extended set, yielding a set of frequency domain coefficients (403), at least some of which are scaled (405). An inverse Fourier transform is performed on the set of scaled frequency domain coefficients to provide a set of time domain samples (407), which are partially overlapped in time and added with a previously formed set of time domain samples (409 and 411), which result is provided with the non-overlapping time domain samples as a noise suppressed version of the signal (413).

REFERENCES:
patent: 4811404 (1989-03-01), Vilmur et al.
Leland B. Jackson, Digital Filters and Signal Processing, 1989, pp. 138-167 .

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