Video signal processing circuits in television receivers

Details Video signal processing circuits in television receivers Video signal processing circuits in television receivers

1986-01-06

1987-06-30

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358133, H04N 514

Patent

active

046774858

ABSTRACT:
A video signal processing circuit for producing a still image picture which can be reduced memory capacity. A digital video signal is divided into higher-significant bit and lower-significant bit which are stored in separate addresses of a memory device. The higher-significant bit data is written in the first address. The lower-significant bit data and an identification data signal are written in the following addresses when the present higher-significant bit data is the same as former higher-significant bit data written in the previous address. The lower-significant bit data and a higher-significant bit data of 1 bit are written in the following addresses when the present higher-significant bit data is different from the former higher-significant bit data of the previous address. When the data read from the memory device are the higher-significant bit data, they are compared with the previously read higher-significant bit data, and the lower-significant bit data is produced in a certain value and then the produced lower-significant bit data and the higher-significant bit data read from the memory device are combined to be outputted as a complete video signal. When the data read from the memory device is a lower-significant bit data, the latest higher-significant bit data stored in the previous address is combined with the read lower-significant bit data to be produced as a complete video signal.

REFERENCES:
patent: 3435134 (1969-03-01), Richards
patent: 3784737 (1974-01-01), Waehner
"Application of Picture Memories in Television Receivers" by Berkhoff et al. IEEE 1983.

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