KR100240347B1 - Tracking method of hi-fi vcr - Google Patents

Abstract

The present invention relates to a method for determining a tracking center of a high-fidelity VR that sequentially traces a video / audio track in a recording mode of a VR, and detecting an endpoint of an audio track detected between the traced video tracks. Wow; If the left end (A-) and the right end (A +) of the audio track are detected between the video tracks, starting tracking at the center point of the left end (A-) and the right end (A +) of the audio track; If the left end (A-) of the audio track is detected between video tracks, the middle point between the left end (V-) of the video track and the left end (A-) of the audio track and at the center point of the right end (V +) of the video track. Initiating tracking; If the right end (A +) of the audio track is detected between video tracks, tracking is performed at the midpoint between the right end (V +) of the video track and the right end (A +) of the audio track, and at the center point of the left end (V-) of the video track. Initiating.

That is, the present invention implements accurate tracking of high-fidelity VRs, thereby providing a more clear picture quality to the user.

Description

Hi-fi V's tracking method

TECHNICAL FIELD The present invention relates to a Hi-Fi video cassette recorder (hereinafter abbreviated as V-CAL), and more particularly to a tracking method of Hi-Fi V-Cal.

Hi-Fi is to record and play back the original sound faithfully, and V-Cal employs a rotating audio head system for this purpose.

In other words, Hi-Fi V-Cal is designed to provide consumers with high-quality stereo sound by reinforcing the low frequency band and low sound quality of fixed heads by rotating the head with respect to the tape that proceeds unlike the audio head of V-AL. It refers to a device.

In addition, in order to record such stereo sound, high-fidelity audio records an incoming audio signal in a deep portion of the video tape, and a video signal is recorded over the surface portion of the video tape using a conventional video head.

At this time, the video signal is recorded in a straight line inclined on the tape surface by winding the video tape on a rotating drum (actually, it is a helical pattern because the tape moves. This is called a helical scan). The head must be correctly traced on the recorded video track.

Matching the trajectory of the rotating head with the trajectory of the track recorded inclined is called tracking.

In the VHS VCD, since the video tracks are recorded without gaps in a width of about 20 to 58 micrometers, it is not easy for the head to trace without deviation on the video tracks. Therefore, at the time of reproduction, the positional relationship between the tape and the head is made the same as when recording by controlling the rotational phase of the video head by using the control signal recorded on the control track as a reference signal.

However, since the position where the video track is recorded by the rotating head and the position where the pulse signal is recorded by the fixed head are separated from each other during tracking of V-Cal, it is not so much a problem when playing back the self-recorded tape. When playing back a recorded tape, tracking often occurs.

In order to correct this case, the recent VRC includes a control process for automatically tracking the center position between the (-) edge and the (+) edge of the video track as the tracking center.

On the other hand, in the case of high-fidelity CD, as described above, since audio and video tracks are sequentially recorded, it is possible to track a center point of one track among the audio or video tracks as a tracking center.

However, in a typical high-fidelity VR, the position of the audio and video tracks is slightly out of position due to the positional deviation of the audio head and the video head. In this case, in conventional hi-fi VRCs, high-fi, i.e. audio, has been prioritized and tracked.

In this case, especially for video tapes recorded with other equipment, there is a large error between the Hi-Fi track and the video track, so it is difficult to track at the point where the video signal is not good, or at the point where the audio and video signal are both bad. Occurred.

That is, the conventional tracking method has a problem in that the user cannot provide a clear image quality of high-fidelity VR.

Accordingly, an object of the present invention is to provide a method for tracking high-fidelity VRs which selectively tracks according to an end point of an audio track detected between a video track to be traced. .

In order to achieve the above object, the present invention provides a method for determining a tracking center of a high-fidelity VAL that sequentially traces a video / audio track in a recording mode of a V-CAL. Detecting an endpoint; If left and right ends of the audio track are detected between the video tracks, starting tracking at the center point of the left and right ends of the audio track; If a left end of the audio track is detected between the video tracks, starting tracking between the left end of the video track and the left end of the audio track and at the center point of the right end of the video track; If a right end of the audio track is detected between the video tracks, initiating tracking at the midpoint between the right end of the video track and the right end of the audio track, and at the center of the left end of the video track. Provides a tracking method of VP.

1 is a functional block diagram of a hi-fi VRC for performing a tracking method according to the present invention;

2 is a flowchart of a process of performing a tracking method according to the present invention;

3 is a diagram illustrating an audio / video track pattern of a recorded video tape as an embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

10: key matrix 20: micom

30: Deck 40: OSD

50: signal processor 60: speaker

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is a schematic block diagram of a hi-fi VRC for performing a tracking method according to the present invention, the key input unit 10, the microcomputer 20, the deck 30, the signal processing unit 40, OSD 50 and speaker 60.

Here, the key input unit 10 includes a plurality of function keys (not shown) for selecting various functions (playback, recording, still, etc.) of the hi-fi VRC, and any arbitrary function corresponding to the user's key operation. The key signal is output to the microcomputer 20.

The deck 30 is provided with various components necessary for the mechanism of the hi-fi V'al, including the head drum, and the head drum is rotated in response to the playback command signal from the microcomputer 20, so that the head is rotated. Video and audio heads are mounted on the drum to read video and audio signals from the videotape.

The signal processor 50 separates the image signal read from the deck 30 into luminance and color signals, processes the image signal into a displayable signal, and outputs the signal to the OSD 40. In addition, the signal processor 50 provides a voice signal read from the deck 30 to the speaker 60.

On the other hand, the microcomputer 20 controls the components of the Hi-Fi V-Cal described above, and the audio / video head located in the deck 30 in the playback mode of the V-Cal is used to record the audio / video track when recording the videotape. Control to trace correctly.

That is, the microcomputer 20 senses the edge of the audio track detected between the video tracks of the video tape being traced, and calculates a tracking center corresponding to the audio track edge. Therefore, the microcomputer 20 controls the VR to perform the playback mode in the above-described tracking center.

Next, the process of performing the tracking method according to the present invention together with the above-described configuration unit will be described in detail with reference to the flowchart of FIG. 2.

First, when a key signal, eg, a playback key signal, is applied to the microcomputer 20 in the key matrix 10, the microcomputer 20 outputs a playback control signal for performing the playback mode to the deck 30 (step 100). .

When a playback signal is applied to the deck 30 and a consumer preference, i.e., a desired tracking level value, is input by the user's tracking adjustment, the microcomputer 20 records the audio / video head in the deck 30 on the videotape. Control to trace audio / video tracks.

At the same time, deck 30 provides the audio / video track edge values recorded on the videotape to micom 20 (step 102). FIG. 3 exemplarily shows a track pattern showing the edge of such an audio / video track.

Prior to the description, the track pattern of FIG. 3 has taken the case where the edge A- of the audio track is recorded between video tracks.

As can be seen from the track pattern of FIG. 3, it can be seen that in high-fidelity video and audio signals are sequentially recorded at predetermined time intervals.

That is, the unillustrated video / audio heads in deck 30 are alternately mounted on the side of the rotating head drum at regular intervals, so that the video / audio tracks are constant on the video tape as the head is traced to the video tape. It is recorded at intervals.

And, each track has a width of a certain interval (the width of each track corresponds to the width of each head), so that the video track is from (V-) to (V +), and the audio track is from (A-) to ( A +) has an edge value.

In addition, as can be seen from the operation description to be described later, since the edge (A-) of the audio track is recorded between the video tracks, the video / audio head in the deck 30 is controlled by the tracking method according to the present embodiment. Tracking starts at the center point S between the edge V- and the audio edge A- and the center point S between the video edge V +.

2, once the video / audio track edge value is provided to the microcomputer 20, the microcomputer 20 selectively hi-fi according to the audio track edge value detected between the video tracks set by the user preference input. Tracking of V-Cal is controlled (step 104).

That is, when both audio track edges A + and A- are detected between video tracks, the microcomputer 20 controls the deck 30 to start tracking at the center point between the audio tracks A + and A-. (Step 106).

In addition, if the audio track edge (A-) is detected between video tracks, the microcomputer 20, as described above, between the center of the video track edge (V-) and the audio track edge (A-) and the video edge (V +) Deck 30 is controlled to initiate tracking at the center point (step 108).

Finally, when the audio track edge (A +) is detected between the video tracks, the microcomputer 20 starts the tracking at the center point between the video track edge (V +) and the audio track edge (A +) and the center point between the video edge (V-). Control 30 (step 110).

As described above, the present invention implements accurate tracking of high-fidelity VRs, thereby providing the user with a clearer picture quality.

Claims (1)

As a tracking method of Hi-Fi V-Cal, which sequentially traces the video / audio tracks in V-Cal recording mode, Detecting an endpoint of the audio track detected between the tracked video tracks; Initiating tracking at the center point of the left end (H−) and the right end (H +) of the audio track if a left end (H−) and a right end (H +) of the audio track are detected between the video tracks; When the left end H- of the audio track is detected between the video tracks, the middle between the left end V- of the video track and the left end H- of the audio track and the right end of the video track Initiating tracking at the center point of V +); If the right end (H +) of the audio track is detected between the video tracks, the middle between the right end (V +) of the video track and the right end (H +) of the audio track and the left end (V−) of the video track. Initiating tracking at a center point of the high-five V'AL.

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