Servo circuit for rotary heads of a video tape recorder

Details Servo circuit for rotary heads of a video tape recorder Servo circuit for rotary heads of a video tape recorder

1979-08-06

1981-05-19

Cardillo, Jr., Raymond F.

Dynamic magnetic information storage or retrieval

Manual input recording

360 21, 360 70, H04N 5785

Patent

active

042688736

ABSTRACT:
A servo circuit is disclosed for a video tape recorder of helical scan type having two rotary heads, in which recording/reproduction is capable of being performed at different tape feed rates, and a recording track for the video signal is formed partially superimposed on the previously-formed recording track, thus forming a recording track narrower than the heads when the tape feed rate is low. A control pulse which is in phase with the vertical synchronizing signal extracted from the video signal to be recorded is recorded in the control track, and the rotational phase of the rotary heads is controlled by use of the control pulse read at the time of reproduction. The servo circuit causes a shift in the phase of the control pulses and a change in the phase of the control pulses before recording when the tape feed rate is low.

REFERENCES:
patent: 4007484 (1977-02-01), Amaki
patent: 4040101 (1977-08-01), Zoellner et al.
patent: 4131912 (1978-12-01), Hirai
patent: 4180833 (1979-12-01), Nishikawa et al.
patent: 4184181 (1980-01-01), Misatovic

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