Electrical audio signal processing systems and devices – Noise or distortion suppression – Interpolation
Patent
1990-10-29
1992-12-01
Dwyer, James L.
Electrical audio signal processing systems and devices
Noise or distortion suppression
Interpolation
381106, 381100, H04B 1500, H03G 300, H03G 700
Patent
active
051685264
ABSTRACT:
Apparatus for reducing distortion in a peak limited audio siganl. The amount of low-frequency spectral energy in the input audio signal is determined for a peak limited signal and used to control low-frequencies in the output audio signal. Identical low-pass filters with cut-off frequencies of 2.2 kHz are used; one passing a peak limited signal, the other a non-peak limited signal. When no noticeable low-frequency spectral energy is present in the peak limited (clipped) signal, the peak level is controlled below 2.2 kHz, without distortion, by a VCA and above 2.2 kHz by a clipper. When low-frequency spectral energy is present, the VCA reduces gain on each low-frequency wave to prevent uncontrolled safety clipping.
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patent: 4363007 (1982-12-01), Haramoto et al.
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patent: 4630304 (1986-12-01), Borth et al.
patent: 4674122 (1987-06-01), Orban
McAulay and Malpass Title: A Real-Time Noise Suppression Filter for Speech Enhancement & Robust Channel Vocoding Date: Apr. 1980; Conference, ICASSP 80, Proceedings IEEE Inter. Conf.
AKG Acoustics, Inc.
Chiang Jack
Dwyer James L.
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