Dropout compensating apparatus using a digital delay circuit

Details Dropout compensating apparatus using a digital delay circuit Dropout compensating apparatus using a digital delay circuit

1984-10-17

1987-08-11

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

360 381, H04N 576

Patent

active

046865837

ABSTRACT:
A dropout compensating apparatus used in a video signal recording/reproducing apparatus employs a digital delay circuit such as a digital memory. An input video signal is converted to a digital signal by an A/D converter. The digital signal is applied via a first switch to the digital delay circuit where it is delayed by a specified period. The delayed digital signal is converted to a delayed video signal by a D/A converter. The delayed video signal is applied to a second switch. A dropout detector produces a dropout detected signal when a dropout occurs in the input video signal. The first switch normally passes the digital signal from the A/D converter and is responsive to the dropout detected signal for passing the delayed digital signal from the digital delay circuit back to the digital delay circuit. The second switch normally passes the input video signal as it is and is also responsive to the dropout detected signal for passing the delayed video signal from the D/A converter.

REFERENCES:
patent: 4251831 (1981-02-01), Kamath
patent: 4315331 (1982-02-01), Lemoine et al.
patent: 4577236 (1986-03-01), Takanashi

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