JPH03198213A - Vtr reproducing and tracking circuit - Google Patents

Abstract

PURPOSE:To simultaneously obtain the optimum tracking positions of a video signal and HiFi sound signal by providing respectively independent tracking circuits for the video signal and the sound signal. CONSTITUTION:A video tracking circuit 17 and a video head angle adjusting circuit 18 are added to the conventional digital tracking mechanism. The digital tracking circuit 8 first matches the sound tracking position with the optimum position by an HiFi sound envelope signal 13 and tape position information 10. A VTR reproduced video tracking circuit 17 calculates the optimum angle of a video head by the video envelope signal 14 and controls the video tracking to the optimum position via the angle adjusting circuit 18 and, therefore, the simultaneous execution of the optimum tracking positions of the sound signal and the video signal is possible.

Description

[Detailed description of the invention] [Fields of use during separation from work] This invention is based on the 11th VTRK.

[Conventional technology]

FIG. 3 is an explanation of the configuration of a conventional digital tracking system in a VTR7.

In the figure: lIμVTR tapes 1 and 21 are tape feed motors, 31 is a rotating drum to which a video head 5) and a HiFi audio head 16) are fixed.

191rI'1 An envelope conversion circuit that converts HiFi audio playback=qa51 and video playback 1g No. 1361 into HiFi audio envelope signal 031 and video envelope signal 04, respectively, (8) envelope tt moat,
a digital tracking circuit that calculates tracking information t121 from Q41 and tape position information +IO1;
171i tape feed motor (21 control motors @
ll ([81 circuits.

Let me briefly explain the operation. The digital tracking circuit (8) is a HiFi audio envelope member U31. Optimal tracking position l from video envelope signal circle and tape position information 110+! Calculate i, motor control circuit ()
) Tracking is performed through .

[Problem to be solved by the invention]

Since the conventional VTR playback tracking circuit was configured as described above, the angle of the video head on the rotating drum was fixed, so the tracking of HiFi audio %bright elephant was 1k.
1 system, and there was a problem that it was not possible to obtain both t and transmission values at the same time.

This invention was made to solve the above-mentioned problems, and provides the best tracking for video and HiFi audio! The purpose is to obtain i simultaneously.

[Next means to solve the problem]

The VTR playback tracking circuit according to the present invention uses the angle A node mechanism of the video head conventionally used for noise erase speed search during playback, and provides independent tracking circuits for HiFi audio and video. be.

[Effect]

The VTR playback tracking circuit in this invention includes:
The optimal angle of the video head is calculated from the video envelope No. 1g, and video tracking is controlled to the optimal position via the angle a4 node 1oJ path.

〔Example〕

An embodiment of the invention will be described below with reference to the drawings. 1st
In the figure, (11 is a VTR tape, (2) is a tape feed motor, 131 is a video head, 61 and 1 (1Fi
rotating drum (9) on which the audio head (6) is fixed;
The HiFi audio playback signal a0 and the 1-celestial image 4° playback signal 0 are respectively converted into the HiFi audio envelope signal u31. Envelope transformation rotation for converting into a phantom envelope signal 1141, tsl is envelope t131°a
te, a digital tracking circuit that calculates tracking information t121 from 4 and tape position information +101;
1 is a motor control subcircuit for the tape feed motor, and I is an image tracking circuit that performs tracking via an image head angle adjustment circuit.

I will explain about Hisa Vc# work. First, the HiFi audio tracking is adjusted to the optimal position using a conventional digital tracking mechanism. Thereafter, the angle of the video head (between the top and bottom of the video head (6) shown in FIG. 2) is changed and fixed at the point where the video envelope deviation is maximum.

〔Effect of the invention〕

As described above, according to the present invention, since the tracking of HiFi audio and video is made independent, there is an effect that both f&over tracking can be obtained at the same time.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the configuration of a VTR playback tracking circuit according to an embodiment of the present invention, FIG. 8 is an explanatory diagram of the configuration of the video tracking circuit of FIG. 1, and FIG. FIG. In the figure: l is the VTR tape, +1+ is the motor, 1
31 is a rotating drum, 141 is a control pulse playback head, 151 is a video head, (6) is a HiFi audio head% + 71 td motor control side sub circuit + 81d digital tracking circuit, (91 is an envelope conversion circuit, aη
1J81 shows a video tracking circuit, and 1J81 shows a video head angle adjustment circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A VTR playback tracking circuit characterized by having a mechanism that can simultaneously obtain the optimum tracking position of a video signal and a HiFi audio signal during playback of a VTR.