KR0137260B1 - Video tape recorder having function of editing audio signals - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a VTR having a function of editing an audio signal on a video tape. Means for controlling the speed of the capstan motor that determines the tape speed for recording the video signal and the audio signal on the tape, the video signal track and the second audio signal track, and recording the video signal on the video signal track of the videotape. A video signal recording means having a video head means for reproducing, a video signal reproducing means for reproducing a video signal recorded on a tape by the video signal recording means, separately recording on a first audio signal track of the video tape, or Voice signal recording with voice head means for recording a voice signal on a second voice signal track adjacent in parallel with the signal track However, the video signal recording means, the video signal reproducing means, the audio signal recording means, the audio in accordance with the audio signal reproducing means for reproducing the audio signal recorded on the tape by the audio signal recording means and the mode selection signal applied from the outside. And switching means for enabling or disabling the encoding playback means, respectively, wherein the switching means includes, when the audio editing mode selection key signal is applied, the video signal reproduction means for recording the audio signal while reproducing the video signal. The audio signal recording means can be enabled to selectively perform a video and audio playback mode, a video playback and audio recording mode, or a video and audio recording mode.

Description

Video tape recorder with audio signal editing

1 is a schematic diagram showing a track structure of a head and a tape of a conventional VTR;

2 is a schematic diagram showing a track structure of a head and a tape of a VTR according to the present invention;

3 is a block diagram showing a means for controlling the speed of a chuckston motor according to the present invention;

4 is a schematic diagram showing a step between the heads according to the present invention;

5 is a block diagram showing an embodiment of a VTR having a voice signal editing function according to the present invention.

※ Explanation of code for main part of drawing

50: video signal recording unit 60: video signal playback unit

70: audio signal recording unit 80: audio signal reproduction unit

SW1, SW2: switch

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video tape recorder (hereinafter referred to as a VTR), and more particularly to a VTR having an audio signal editing function capable of separately recording and reproducing an audio signal on a tape.

In general, dubbing of voices is often performed during the production of videotape or television dramas. When performing the audio dubbing operation, as well as in other cases, it is frequently necessary to edit only the audio signal separately from the video signal. When the sound line signal is a normal sound signal, since there is a separate track for the sound signal on the video tape, an editing function for arbitrarily recording and reproducing the sound signal is possible.

However, when using a Hi-Fi audio signal such as the S-VHS (Super-Video Home System) used in recent years, it is difficult to edit an audio signal unless a video signal recorder and an audio signal recorder are used separately. There was a problem with getting lost.

Accordingly, an object of the present invention is to provide a VTR having an audio signal editing function capable of recording and reproducing a hi-fi audio signal together with or separately from a video signal.

A feature of the present invention for achieving the above object is that in a video tape recorder for recording / reproducing video signals and audio signals, the first audio signal track is located separately from the video signal track, and the video signal track and the second audio signal. A video tape having a helical track structure in which signal tracks are located adjacent to and parallel to each other, and controlling the speed of a capstan motor for determining a tape speed for recording a video signal and an audio signal on the video signal track and the second audio signal track. Means, video signal recording means including a video head portion for recording a video signal on a video signal track of the video tape, video signal reproducing means for reproducing a video signal recorded on a tape by the video signal recording means, and the video tape A second audio signal separately recorded on the first audio signal track of the video signal or adjacent to the video signal track Audio signal recording means including a sound head portion for recording an audio signal on a track, audio signal reproducing means for reproducing an audio signal recorded on a tape by the audio signal recording means, and the image according to a mode selection signal applied from the outside; And switch means for enabling or disabling signal recording means, video signal reproducing means, audio signal recording means, and voice encoding and reproducing means, respectively, wherein the switch means is provided with a video editing mode selection key signal. A video tape having an audio signal editing function, characterized by enabling the video signal reproducing means and the audio signal recording means to record an audio signal on the second audio signal track while reproducing the video signal recorded on the track. It is in the recorder.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the recording / reproducing method of the conventional video signal and audio signal and the recording / reproducing method of the video signal and audio signal of the VTR according to the present invention will be compared.

FIG. 1A shows a drum on which a recording / reproducing head of a conventional VTR is mounted, and FIG. 1B shows a tape on which video and audio signals are recorded by the drum of FIG. 1A. The drum of FIG. 1A has a first head H1v and a second head H2v for recording / hashing an image signal, and a first erasing head (FE-H1v) for erasing an image signal recorded on a tape. ). FIG. 1B shows the data recording state of the tape by the recording / reproducing apparatus as shown in FIG. 1A. The track of the video signal consisting of the luminance signal Y and the color signal C is allocated in the middle, the track T _A of the audio signal is allocated in the upper portion, and the track T _CTL of the control signal is allocated in the lower portion. In such a conventional data recording / reproducing system, a head for accessing the track T _A of the audio signal is provided separately to separately record / reproduce the audio signal.

2A is a head drum of a VTR according to the present invention, which includes a first head H1v and a second head H2v for recording / reproducing a video signal, and a third head H3 _A for recording / reproducing an audio signal. 4 heads H4 _A , a first erasing head FE-H1v for canceling video signals, a second erasing head FE-H2 _A for canceling audio signals, and a third erasing head FE-H3v. . FIG. 2B shows a track of a tape on which video and audio signals are recorded / reproduced by the recording / reproducing apparatus as shown in FIG. 2A. As shown, in addition to the first audio signal track T _A allocated at the top, a second audio signal track in which the audio signal is recorded / reproduced is positioned alongside the track in which the video signal Y + C is recorded / reproduced. . In this manner, in order to record the video signal Y + C and the audio signal A, the tape speed must be doubled, and the video recording / playback head and the audio recording / playback head must be operated simultaneously as one head. In other words, the first head H1v and the third head H3 _A , and the second head H2v and the fourth head H4 _A are simultaneously operated in FIG. Video signals and audio signals are recorded and played back on the signal track. In addition, when reproducing the video signal and recording the audio signal at the same time, the second erasing head FE-H2 _A and the third erasing head FE-H3 _A are required in order to erase the audio signal first and then record it. do.

In addition, to double the tape speed, the speed of the capstan motor must be doubled. An apparatus for doing this is shown in FIG. The output frequency f _FG of the frequency generator (FG), which varies according to the speed of the capster motor 31, is applied to the first input terminal Q of the switch SW, and the FG output signal is a multiplier of 2/1 ( 32 is applied to the second input terminal b of the switch SW. The output stage c of the switch SW is connected to the capstan speed controller 33, and the capstan speed controller 33 compares the frequency input from the switch SW with the reference frequency REF, so that the input frequency is the reference frequency. The speed of the capstan motor 31 is controlled to be equal to REF.

In order to double the speed of the capstan motor in order to record / reproduce video and audio signals on the video tape of the present invention as shown in FIG. 2 (b), first, the high level may be high level (or low level). Control signal CTL is applied to the switch SW, and thus, the switch SW is switched to the second input terminal b so that the capstan speed control unit 33 receives the frequency-halved FG signal output from the multiplier 32. ). Then, the capstan speed controller 33 compares the input frequency with the reference frequency REF and doubles the speed of the capstan motor 31 so that the input frequency is equal to the reference frequency. When the speed of the capstan motor is doubled in this way, the width of the track passing by the head is doubled during the time of one field. Therefore, it is possible to simultaneously record / reproduce video signals and audio signals on a track twice as wide.

As described above, in order to simultaneously record / reproduce the video signal and the audio signal on the tape, there is a predetermined step between the heads operating simultaneously among the heads of FIG. 4 (a) shows the step between the first head (H1v) and the third head (H3 _A ), the fourth (b) is the second head (H2v) and the fourth head (H4 _A ) and the second erasing head The difference between (FE-H2 _A ) is shown. The step difference between the first head H2v and the third head H3 _A , and the second head H2v and the fourth head H4 _A is 58 μm, respectively, and the second head H2v and the second erasing head FE The step between -H2 _A ) is 58 (1-K) μm. Here, k is θ / 180, and θ corresponds to the angle where the second erasing head FE-H2 _A is earlier than the fourth head H4 _{A for} recording / reproducing voice signals.

5 is a block diagram showing a system for recording / reproducing video signals and audio signals in a VTR having an audio signal editing function according to the present invention. The apparatus of FIG. 5 is composed of a video signal recording unit 50, a video signal reproducing unit 60, an audio signal recording unit 70, and an audio signal reproducing unit 80. The tape speed is doubled as described above. An audio signal is edited by the capstan motor control means (not shown in the fifth). The approximate components of each part are as follows.

The image signal recording unit 50 includes a luminance / color signal separation unit 51 for separating the input image signal into a luminance signal Y and a color signal C, and a frequency modulator for frequency-modulating the separated luminance signal Y. 52, a low frequency converter 53 for converting the separated color signal C into a low frequency signal roll, and a mixing part for mixing luminance signals and color signals output from the frequency modulator 52 and the low frequency converter 53, respectively. 54, and a recording section 55 for recording the output signal of the mixing section 54 on the tape T. As shown in FIG.

The video signal reproducing unit 60 reads out and reproduces the video signal recorded on the tape T, and outputs the output signal of the reproducing amplifier 61 to the luminance signal Y and the color signal C. The luminance / color signal separation unit 62 for separating the signal; the frequency demodulation unit 63 for frequency demodulating the separated luminance signal Y; A high frequency converter 64 for converting and a mixing unit 65 for mixing the signals output from the frequency demodulator 63 and the high frequency converter 64, respectively.

The audio signal recording unit 70 includes a modulation unit 72 for frequency modulation or pulse code modulation of the input audio signal, and a recording unit 74 for recording the modulated signal on the tape T. FIG.

The audio signal reproducing unit 80 includes a reproducing amplifier 82 which reads out and reproduces the audio signal recorded on the tape T, and a demodulation unit 84 which demodulates the reproduced signal and outputs the audio signal.

Each of the operation units operates or deactivates by the enable or disable signal supplied from the first switch SW1 and the second switch SW2 to perform recording and reproduction of a general video / audio signal. You can perform voice signal editing. The operation of each part of the system according to the on or off state of the first switch SW1 and the second switch SW2 is as follows.

First, a description will be given when the apparatus of the present invention performs recording and reproducing operations.

When the recording mode selection signal is input from the outside, both the first switch SW1 and the second switch SW2 are turned OFF. That is, when the sliders of the two switches SW1 and SW2 connect the ground terminal and the output terminal, the video signal recording unit 50 and the audio signal recording unit 70 are enabled, and the video signal reproducing unit 60 The audio signal reproducing unit 80 is disabled. The system then enters a video and audio recording mode capable of simultaneously recording video and audio signals to the video signal track and the second audio signal track. When the reproduction mode selection signal is applied from the outside, both the first switch SW1 and the second switch SW2 are turned on. That is, each slider of the first switch SW1 and the second switch SW2 is connected to a 5V input terminal and an output terminal so that the video signal reproducing unit 60 and the audio signal reproducing unit 80 are enabled. 50 and the audio signal recording unit 70 are disabled. In other words, the video and audio playback modes for simultaneously playing back video and audio signals recorded on a tape are provided.

In order to perform the voice editing operation of the present invention, when the voice editing mode selection key signal is applied from the outside, the first switch SW1 is turned on and the second switch SW2 is turned off. Thus, the video signal reproducing unit 60 and the audio signal recording unit 70 are enabled, and the video signal recording unit 50 and the audio signal reproducing unit 80 are disabled. Then, the system enters the video playback / audio recording mode in which audio signals can be recorded on the tape while playing back video signals on the tape.

As described above, the VTR having the audio signal editing function according to the present invention is a VTR for recording / reproducing the video signal and the audio signal by spiral scanning on a tape, wherein the video and audio reproduction mode, Image playback, audio recording mode, or video and audio recording mode can be selectively performed. As a result, an audio signal editing function capable of recording / reproducing an audio signal simultaneously with or separately from the video signal is provided.

Claims (8)

In a video tape recorder for recording / reproducing video signals and audio signals, A video tape having a spiral track structure in which a first audio signal track is located separately from the video signal track, and the video signal track and the second audio signal track are adjacent and parallel to each other; Means for controlling a speed of a capstan motor for determining a tape speed for recording a video signal and an audio signal in the video signal track and the second audio signal track; Video signal recording means including a video head portion for recording a video signal on the video signal track of the video tape; Video signal reproducing means for reproducing the video signal recorded on the tape by the video signal recording means; Audio signal recording means including a sound head portion for separately recording on a first audio signal track of the video tape or recording a voice signal on a second audio signal track adjacent to the video signal track in parallel; Audio signal reproducing means for reproducing the audio signal recorded on the tape by the audio signal recording means; And And switching means for enabling or disabling the video signal recording means, the video signal reproducing means, the audio signal recording means, and the audio signal reproducing means, respectively, according to a mode selection signal applied from the outside. When the audio editing mode selection key signal is applied, the switch means records the video signal reproducing means and the audio signal to record the audio signal in the second audio signal track while reproducing the video signal recorded on the video signal track. A video tape recorder having a voice signal editing function, characterized by enabling means. The method of claim 1, wherein the means for controlling the speed of the capstan motor A multiplier for reducing the frequency generator (FG) frequency signal, which varies depending on the speed of the capstan motor, to half; A first input terminal for receiving the FG frequency signal and a second input terminal for receiving the FG frequency signal reduced by 1/2 at the multiplier; and a FG reduced to 1/2 when a voice signal editing key signal is applied A switch for selecting a second input terminal to select a frequency signal; And And a capstan speed controller configured to receive a signal input from the switch and a reference signal from the outside, and output a control signal for varying the speed of the capstan motor such that the frequency of the input signal is equal to the frequency of the reference signal. A video tape recorder having an audio signal editing function. The method of claim 1, wherein the image head unit A video tape recorder having an audio signal editing function, comprising: a first head for recording / reproducing a video signal, a second head, and a first erasing head for erasing a video signal. The method of claim 1 or 3, wherein the voice head portion A third head operating simultaneously with the first head to record / reproducing a voice signal, and a fourth head operating simultaneously with the second head to record / reproduce a voice signal, and simultaneously operating with the fourth head to erase the voice signal. A video tape recorder having a voice signal editing function, characterized in that it comprises a second erasing head and a third erasing head which is operated simultaneously with the third head to cancel the audio signal. The video tape recorder according to claim 4, wherein the first head and the third head have a step length of a predetermined length. 5. The video tape recorder according to claim 4, wherein the second head, the fourth head, and the second erasing head have a step length having a predetermined length therebetween. 7. The video tape recorder according to claim 6, wherein the step between the fourth head and the second erasing head is as follows. Step = 58 (1-K) [μm] Here, K = θ / 180, where θ is the second erase head is the fourth Angle ahead of the head. The method of claim 1, wherein the switch means A voltage having a predetermined magnitude is applied to the first input terminal, the second input terminal is grounded, the output terminal is connected to the enable terminal of the video signal recording means, and is connected to the enable terminal of the video signal reproduction means through an inverter. Connected first switch; And A voltage having a predetermined magnitude is applied to the first input terminal, the second input terminal is grounded, the output terminal is connected to the enable terminal of the audio signal recording means, and is connected to the enable terminal of the audio signal reproducing means via an inverter. A video tape recorder having a voice signal editing function comprising a second switch connected thereto.