Keyed AGC circuit for video data transmitting device

Details Keyed AGC circuit for video data transmitting device Keyed AGC circuit for video data transmitting device

1980-12-15

1983-04-19

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 552

Patent

active

043807771

ABSTRACT:
A keyed AGC circuit for use in a video data transmitting device such as a facsimile system which operates stably in the presence of external noise. A processing circuit is provided for carrying out digital processing determining whether the synchronizing signal level at an output terminal of the AGC circuit is higher or lower than a pre-set reference level. A multi-stage digital attenuator is controlled in response to outputs of the processing circuit to set the attenuation level. Control of the multi-stage digital attenuator can start with either the most significant bit position of the attenuator prior to video data transmission or with a least significant bit position of the attenuator in a synchronization period after video data transmission has been started.

REFERENCES:
patent: 3909522 (1975-09-01), Hofmann

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