KR19990026151A - V Seed's Special Recording / Playback - Google Patents

Abstract

VCR's special recording / playback device is designed to prevent the leakage of information recorded on the tape, illegal duplication of the tape, and illegal viewing. Selected according to input of special playback key or special recording key by attaching separate AC head for special recording and playback at the front or rear of ± x from JVC standard 79.244mm from the initial position of video track where video signal is recorded The AC head drives the AC head to enable special recording and playback with a standard different from the existing JVC standard.

Description

V Seed's Special Recording / Playback

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video cassette recorder (VCR) and, more particularly, to a special recording device of a VCR.

Hereinafter, the recording method of the VCR according to the prior art will be described. 1 is a diagram showing the positions of video, audio, and control heads on each recording area and a tape of a general video tape.

In general, the video tape 1 has a control for recording a video track for recording a video signal, an audio track for recording an audio signal, and a control signal for reproducing the audio signal and the video signal, as shown in FIG. It is divided into tracks.

1, an audio head 2 for recording an audio signal on an audio track and reproducing the recorded audio signal, and a control head for recording a control signal on the control track and reproducing the control signal. (3) and video heads 4 and 4 'for recording a video signal on a video track and reproducing the recorded video signal, respectively.

Here, the capstan servo of the VCR for recording the audio signal and the video signal on the video tape 1 will be described.

The capstan servo is for controlling the speed of the tape so that the recording tracks of the video tape 1 do not overlap. Then, a control signal (CTL signal) of 30 Hz pulse is recorded on the control track of the video tape 1 through the control head 3 to use it as a reference signal when the video tape 1 is reproduced, and the CTL signal thus recorded is recorded. Is reproduced by the control head 3.

The recording of the CTL signal is applied to the AC heads (Audio / Control Heads) 2 and 3 by crossing the voltage values at the microcomputer (not shown) of the VCR, and the AC heads 2 and 3 receive the voltage pulses. The control track records magnetic N, S, N, and S arrays. During playback, the output voltage appears at a constant level depending on the frequency characteristics, circuit characteristics, and head characteristics of the video tape.

This reproduction CTL signal is used for phase control of a capstan motor (not shown). This means that the position of the CTL signal indicates the position of the recording signal at the time of reproduction. That is, since the distance between the position of the CTL signal and the video signal recording track is 79.244 mm, which is determined by the JVC standard, the video heads 4 and 4 'trace the track as in the case of recording based on the control signal. Will play the signal.

Looking at the operation of the reproduction servo, the head is accurately traced on the recorded video track, and the video track is recorded without gaps in a width of about 20-58 μm, so it is not easy for the head to accurately track the video track. Therefore, at the time of reproduction, the CTL signal recorded in the control track is reproduced and the rotational phase of the video heads 4 and 4 'is controlled using this as a reference signal so that the positional relationship between the video tape and the head is kept the same.

The video signal recorded on the video track is recorded 79.244 mm behind the control signal recorded on the control track, and the audio and control signals are located 79.244 mm ahead of the video signal. Accordingly, the speed of the capstan motor is controlled in accordance with the control signal read by the AC heads 2 and 3 during auto tracking, thereby accurately matching the positions of the control and the video heads 4 and 4 '. However, if the 79.244mm does not match, a completely different track is read, and the correct screen due to noise is not seen on the screen.

In the conventional VCR recording method, an audio head and a control head, that is, an AC head are provided one by one, and the position of the video head from the AC head is set to 79.244 mm according to the JVC standard. In the case of recording and reproducing, since no encryption is performed on the video tape itself, recording and reproducing are easily performed, and there is a problem of leaking information recorded on the video tape, illegal viewing of the video tape, and illegal copying.

Accordingly, an object of the present invention is to provide a special recording apparatus of a VCR which prevents leakage of information recorded on a tape and duplication of the tape.

1 is a diagram showing the positions of control heads and video / audio on each recording area of a general video tape and a tape;

2 is a view showing the positions of video, audio and control heads on each recording area of a video tape and a tape in a special recording apparatus of a VCR according to the present invention.

3 is a block diagram of a special recording apparatus of a VCR according to the present invention;

* Explanation of symbols for main parts of the drawings

10: first AC head 20: second AC head

30: switching unit 40: control unit

50: key input unit 60: recording / playback unit

According to an aspect of the present invention, there is provided a special / recording and reproducing apparatus for a VCR, comprising: a key input unit for providing a key input signal for special recording and special reproducing in a VCR recording and reproducing apparatus; ; A control unit providing a selection switching signal according to a key input signal provided from the key input unit; A switching unit for head-selecting switching according to a selection switching signal provided from the control unit; And another AC head attached to the front or rear of the AC head on the same line as the AC head is attached to perform special recording / reproducing operation of the audio signal and the control signal according to the selective switching of the switching unit. Is in.

Another feature of the present invention is that the other AC head is attached at a distance of 79.244 mm ± x from the initial position of the video track.

Hereinafter, an embodiment of a special recording apparatus of a VCR according to the present invention will be described with reference to the accompanying drawings.

Figure 2 is a view showing the position of each recording area of the video tape and the video, audio, control head on the tape in the special recording device of the VCR according to the present invention, Figure 3 is a block configuration of a special recording device of the VCR according to the present invention It is a diagram showing.

First, as shown in FIGS. 2 and 3, the present invention has the audio head 11 and the control head 12 arranged at an interval of 79.244 mm from the video heads 4 and 4 ′, respectively. The audio head 21 and the control head 22 are added and configured. That is, as shown in FIG. 2, another audio head 21 and control head 22 are further configured at a position longer or shorter than 79.244 mm (79.244 mm +/- x). Here x is generally the distance between the audio head 11 and control head 12 and the further configured audio head 21 and control head 22 located at 79.244 mm.

The audio heads 11 and 21 and the control heads 21 and 22 are selectively operated according to a user's key input signal. The configuration and operation of the driving device will be described with reference to FIG. 3. First, referring to FIG. 3, a configuration of a key input unit 50 for providing various key input signals, a controller 40 for outputting a switching control signal according to a key input signal provided from the key input unit 50, and , The switching unit 30 switched according to the switching control signal of the control unit 40, the first and second AC heads 10 and 20 selectively driven according to the switching of the switching unit 30, and the first and second units. And a recording / reproducing section 60 for recording and reproducing audio signals and control signals in accordance with the driving of the AC heads 10 and 20. Here, the key input unit 50 is a remote controller, and special playback and special recording keys for recording / reproducing are additionally attached so as to maintain security rather than general recording / playback. In addition, the first AC head 10 is a head specified in the general 79.244mm standard, the second AC head 20 is the first AC head 10 of the 79.244mm ± x for special playback and recording This is defined as the head located on the same line.

The operation of the special recording apparatus of the VCR according to the present invention having such a configuration will be described.

First, when the user wants to record contents for preventing illegal copying and illegal viewing of video tapes and preventing information leakage, the user inputs a special recording key of the key input unit 50. When the special recording key is input, the controller 40 provides the switching unit 30 with a switching signal for selecting the second AC head 20. The switching unit 30 blocks the operation of the first AC head 10 according to the switching signal of the controller 40, selects the second AC head 20, and selects the second audio head 21 and the second control head. (22) to drive. Therefore, as shown in FIG. 2, the audio signal and the control signal are recorded in the audio track and the video track from the portion where the second AC head 20 is located as the second AC head 20 is driven. That is, the audio signal and the control signal are recorded from the 79.244 mm ± x position. Here, the video signal is also recorded, which is recorded in the video track by the video heads 4 and 4 'as in the prior art.

When the recorded tape is played back, the tape that the user wants to watch is recorded according to the JVC standard (79.244mm) or specially recorded. In the case of the tape which has been specially reproduced by determining whether the tape has been used, the special playback key of the key input unit 50 is selected. When the special regeneration key is selected, the control unit 40 provides the switching unit 30 with the second AC head 20 selection switching signal to the switching unit 30. The switching unit 30 selects and drives the second AC head 20 according to the switching signal provided from the control unit 40. Therefore, the video / audio signal recorded on the video tape is read and reproduced according to the control signal as the second AC head 20 is driven. At this time, the second AC head 20 is positioned, as shown in Figure 2 to reproduce the video signal and the audio signal in accordance with the control signal recorded at a position of 79.244mm ± x.

After all, the present invention by attaching a separate AC head 20 for the special recording and playback on the front or back x distance in the same line at the position where the existing AC head 10 is mounted, according to the user's key input signal It is designed to make special recording and playback in different standard from JVC standard.

The special recording and reproducing apparatus of the VCR according to the present invention attaches a separate AC head 20 for special recording and playback at the front or the rear by x distance in the same line at the position where the existing AC head 10 is mounted. According to the key input signal of, it is possible to make special recording and playback with the standard different from the existing JVC standard. Therefore, it is possible to prevent the illegal copying and illegal viewing of the video tape to prevent the leakage of information.

Claims (4)

In the recording and playback apparatus of a VCR having an AC head, A key input unit for providing a key input signal for special recording and special playback; A control unit providing a selection switching signal according to a key input signal provided from the key input unit; A switching unit for head-selecting switching according to a selection switching signal provided from the control unit; And another AC head attached to the front or rear of the AC head on the same line as the AC head is attached to perform special recording / reproducing operation of the audio signal and the control signal according to the selective switching of the switching unit. Special recording / playback device of the VCR. 2. A special recording / playback apparatus for a VCR according to claim 1, wherein said another AC head is located at a distance of 79.244 mm ± x from a track on which a video signal is recorded. The apparatus of claim 2, wherein x is a distance from an AC head to the another AC head. The apparatus of claim 1, wherein the key input unit further comprises a special playback key for special playback and a special recording key for special recording as a remote controller.