Idle channel noise reduction in a line card having a DSP equaliz

Details Idle channel noise reduction in a line card having a DSP equaliz Idle channel noise reduction in a line card having a DSP equaliz

1990-09-07

1995-07-25

Chin, Stephen

Pulse or digital communications

Receivers

Automatic gain control

4552341, 327551, H04C 2708

Patent

active

054369339

ABSTRACT:
Idle channel noise reduction is achieved in a line card having an analog gain/attenuator, a codec, and a digital signal processor including an equalizer and a digital gain/attenuator. A peak detector samples output from the codec each 8 kHz cycle. A level decision compares the sample to a stored peak value, and replaces the stored peak value with the sample if it is greater. A controller, at a second predetermined interval, increases analog gain in steps and increases digital attenuation in similar steps if the stored peak value is greater than the predetermined threshold. Otherwise, the controller increases analog attenuation in steps and increases digital gain in similar steps.

REFERENCES:
patent: 4191995 (1980-03-01), Farrow
patent: 4625240 (1986-11-01), Yablonski et al.
patent: 4864244 (1989-09-01), Sasaki
patent: 5029182 (1991-07-01), Cai et al.

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