Automatic sound gain control device and a sound recording/reprod

Details Automatic sound gain control device and a sound recording/reprod Automatic sound gain control device and a sound recording/reprod

1992-04-30

1995-04-04

Voeltz, Emanuel T.

Boots, shoes, and leggings

381102, 381106, 381107, 381122, 327331, H03G 500, H03G 700

Patent

active

054043158

ABSTRACT:
A sound gain control device for automatically controlling a gain by which an output signal from a sound CODEC is multiplied is provided. Sound signals from a sound input device are processed by a non-linear conversion circuit so that the sound signals with small amplitudes are enlarged by extending the amplitudes and the time axis thereof, thereby to average the incidence probabilities of amplitudes. Then, a proper amplitude for a gain control is calculated based on the averaged signals by an amplitude calculating circuit, and a gain corresponding to the calculated amplitude is determined by a gain determining circuit and sent as a amplitude coefficient to a multiplier to which the sound signals from the sound input device are input through a sound CODEC.

REFERENCES:
patent: 4631749 (1986-12-01), Rapaich
patent: 4805217 (1989-02-01), Morihiro et al.
patent: 4862270 (1989-08-01), Nishio
patent: 5165017 (1992-11-01), Eddington et al.
patent: 5210806 (1993-05-01), Kihara et al.

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