Video signal reproducing apparatus for converting a video signal

Details Video signal reproducing apparatus for converting a video signal Video signal reproducing apparatus for converting a video signal

1980-06-16

1981-08-11

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 11, 358140, 360 9, 360 33, 360 76, 360 78, H04N 9491, H04N 502, G11B 543, G11B 2108

Patent

active

042837367

ABSTRACT:
In a video signal reproducing apparatus for converting a first video signal having a first field frequency to a second video signal having a second field frequency, there are provided a tape scanning device which is made movable in a direction perpendicular to the recording track on a tape, a system for controlling the speed of the scanning device, a system for shifting the scanning device in the aforesaid direction according to the difference between the first and second field frequencies, in order to skip or repeat selected fields so that the video signal is reproduced with the second field frequency. Also provided is a system for converting the number of lines contained in one field of the first video signal. In the above converting system there is included a memory, and the first video signal is written into the memory and read out therefrom so that a predetermined number of lines of the first video signal are discarded or repeated and the reproduced video signal has the required number of lines for each field of the second video signal.

REFERENCES:
patent: 3157738 (1964-11-01), Okamura
patent: 3283068 (1966-11-01), Urry et al.
patent: 3787616 (1974-01-01), Falk et al.
"Television Standards Converter Using Digital Techniques", The Radio and Electronic Engineer, vol. 43, No. 3, Mar. 1973, pp. 230-232.

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