Electrical audio signal processing systems and devices – Noise or distortion suppression – Spectral adjustment
Patent
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 .
McLaughlin Michael J.
Ramabadran Tenkasi V.
Isen Forester W.
Lukasik Susan L.
Motorola Inc.
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