VISS circuit for preventing image search malfunction occurring d

Details VISS circuit for preventing image search malfunction occurring d VISS circuit for preventing image search malfunction occurring d

1993-12-23

1996-05-21

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

327205, G11B 1518, G11B 1700, G11B 1902

Patent

active

055195490

ABSTRACT:
A VISS circuit for preventing image search malfunction occurrence due to variation in the speed of a video tape used in a video cassette recorder makes it possible to carry out a normal VISS operation by utilizing the pulse width of the Schmitt trigger pulse, which is varied in accordance with the change in speed of the video tape. The circuit includes a Schmitt trigger circuit capable of varying the width of the Schmitt trigger pulse in accordance with variation of upper and lower extreme voltage values of a control signal based on the speed signals after detecting the tape speed signals at the time of the recording and the control signals from the control head, the varied width of the Schmitt trigger pulse being supplied to a VISS operation circuit, and a control device for supplying a signal for varying the width of the Schmitt trigger pulse produced by the Schmitt trigger circuit in accordance with the tape speed. The width of the Schmitt trigger pulse is adjusted in accordance with the magnitude of a control pulse which is proportionate to the tape speed, so that VISS malfunction caused by residual signals and noises can be prevented.

REFERENCES:
patent: 5021896 (1991-06-01), Horino
patent: 5103350 (1992-04-01), Satake
patent: 5166834 (1992-11-01), Mester et al.
patent: 5383067 (1995-01-01), Choi

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