Video signal time base compression apparatus

Details Video signal time base compression apparatus Video signal time base compression apparatus

1991-06-28

1993-01-05

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358160, H04N 701

Patent

active

051776090

ABSTRACT:
A video signal processing apparatus is provided which can be used when a transmitted video signal is displayed on a screen or a CRT having an aspect ratio (e.g. 9:16) different from an aspect ration (e.g. 4:3) of the transmitted video signal. When the video signal is time-base-compressed and displayed on the screen or CRT, a memory is used to store the digitally converted video signal. The video signal is written into the memory every two scan periods and is read out of the memory every two scan periods, thereby executing a double-speed scan conversion and also enabling time-base-compression to be performed. Accordingly, an optimum display state of video signals of various aspect ratios can be obtained by a small number of memory elements.

REFERENCES:
patent: 4605962 (1986-08-01), Christopher et al.
patent: 4719509 (1988-01-01), Sakamoto
patent: 4901148 (1990-02-01), Nakagama et al.
patent: 4953025 (1990-08-01), Saitoh et al.
J-C Guillon, "Multi-feature, Multi-format 16/9 TV Set," Conference and Exhibition on Television Techniques, 12-14, vol. 2, pp. 55-62, Jun. 1990.

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