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

H - Electricity

04

B

179/2

H04B 1/64 (2006.01)

Patent

CA 1104061

66340.913 APPARATUS AND METHOD FOR PEAK-LIMITING AUDIO FREQUENCY SIGNALS Abstract of the Disclosure: 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 psycho- acoustic phenomenon of "masking" is used to estimate maximum (non-audible) clipping. 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.

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