Apparatus and method for peak-limiting audio frequency signals

Details Apparatus and method for peak-limiting audio frequency signals Apparatus and method for peak-limiting audio frequency signals

1978-10-27

1980-06-17

Moffitt, James W.

179 1P, 328162, 328169, H04B 1500

Patent

active

042085489

ABSTRACT:
A peak-limiting apparatus and method particularly useful in systems employing high frequency pre-emphasis to compensate for steep high frequency rolloff in a receiver, or the like. The apparatus and method is useful in standard AM broadcasting to maximize loudness without noticeable distortion. The distortion caused by a clipper is determined by subtracting a clipper's output from its input. This distortion is compared in a plurality of critical bands with the input to provide a gain control feedback signal for a variable gain stage. The psychoacoustic phenomenon of "masking" is used to estimate maximum (non-audible) clipping.

REFERENCES:
patent: 2506770 (1950-05-01), Braden
patent: 3068418 (1962-12-01), Hajian
patent: 3651339 (1972-03-01), Herrmann et al.
patent: 3916293 (1975-10-01), Omori et al.
patent: 3991370 (1976-11-01), Pate
patent: 4016497 (1977-04-01), Miedema
patent: 4103243 (1978-07-01), Orban

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