Tracking and picture quality in a VTR

Details Tracking and picture quality in a VTR Tracking and picture quality in a VTR

1992-01-22

1995-01-24

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358335, H04N 576

Patent

active

053846427

ABSTRACT:
A circuit for automatically compensating tracking and picture quality includes a microcomputer for controlling the overall system by performing a built-in program according to a key input, a servo circuit for performing servo function under the control of the microcomputer, a video processor for processing video signals during recording and playing, an audio processor for processing audio signals during recording and playing, and outputting the maximum value of an audio envelope to the microcomputer, a first picture compensator for changing a specific frequency characteristic gain of the video signal in the video processor under the control of the microcomputer, a second picture compensator for attenuating specific bandwidth noise of the video signal of the video processor under the control of the microcomputer, an envelope detector for detecting the video envelope signal from the video processor, and a drop-out compensating pulse buffer for buffering a drop-out compensating pulse from the video processor. The tracking is automatically controlled to be carried out at optimum position, thereby maintaining optimum picture and audio qualities.

REFERENCES:
patent: 4559567 (1985-12-01), Maruichi
patent: 4623994 (1986-11-01), Nabeshima et al.
patent: 4710832 (1987-12-01), Itoh
patent: 4729041 (1988-02-01), Kuroda
patent: 4734793 (1988-03-01), Kaneko et al.
patent: 4835758 (1989-05-01), Fujishima
patent: 4890169 (1989-12-01), Kobayashi et al.
patent: 4931888 (1990-06-01), Taguchi et al.

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