Video tape control time code reading

Details Video tape control time code reading Video tape control time code reading

1978-11-15

1980-12-02

Moffitt, James W.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 722, G11B 1552

Patent

active

042374995

ABSTRACT:
A video magnetic tape control time code reading method and apparatus enables a control time code comprising binary coded times and frame numbers to be read, independently of the direction and speed of transport of the video tape, to ascertain whether the control time code corresponds to a recorded video signal having a frame frequency of 30 or 25 frames per second. Use is made of the fact that in a 30 frame per second control time code the frame numbers always alternate regularly between odd and even, whereas in a 25 frame per second control time code the two successive frame numbers at every transition from one second to the next are either both odd or both even.

REFERENCES:
patent: 3681524 (1972-08-01), Nicholls
patent: 3739086 (1973-06-01), Heather
patent: 4037260 (1977-07-01), Busby, Jr. et al.
patent: 4044389 (1977-08-01), Oldershaw et al.
patent: 4134130 (1979-01-01), Tachi
patent: 4167759 (1979-09-01), Tachi

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