JPH0766592B2 - Magnetic reproducing device - Google Patents

Description

The present invention relates to a magnetic reproducing apparatus for reproducing a magnetic tape on which video and audio signals received by a television receiver are recorded.

[Prior Art] In a conventional video tape recorder (hereinafter referred to as VTR), a method of using a control signal recorded in a control (hereinafter referred to as CTL) track as capable of selectively reproducing recorded video and audio signals. There is. This is CT
Among the reproduced signals of the L track, the positive pulse is used for controlling the rotary head or the capstan, and the negative pulse is used for purposes other than the above, for example, as the queuing signal.

FIG. 6 is a diagram showing a recording pattern of a video tape in a conventional VTR. In FIG. 6, (1) is a video tape, which includes a video track (2) and a CTL track (3). ), The video signal (4) is recorded, and the CTL track (3) is saturation-recorded by the CTL head (6) through the recording amplifier (5) as shown in FIG. 7B. . This CTL signal (7) is, as shown in FIG. 7 (B), the video signal (4) shown in FIG. 7 (A).
A vertical wave signal that rises in synchronism with a sync signal (not shown) obtained by dividing the vertical sync signal by 1/2 into a positive pulse corresponding to the rising edge as shown in FIG. Only is used for synchronous control of rotating heads or capstans. Here, with the rectangular wave signal for CTL, on the video tape (1) by (B), for example, the positive part of the rectangular wave is N
6th as the saturation magnetization pattern of the S pole in the negative part of the pole and the rectangular wave
The recording as shown in the figure is made.

From the above description, since only the positive pulse is used for control in the reproduction signal of FIG. 7C, the negative pulse can be used for another role. For example, by changing the duty of the rectangular wave signal (B), the generation timing of the negative pulse of the reproduction signal (C) can be moved to have information as a queuing signal. This allows conventional CTL
The CTL track can also be used as a queuing track without affecting the signal.

As this queuing signal, the number of VTR recording / stops,
That is, by recording the number of recording modes and the like, it becomes possible to selectively reproduce only a desired recording portion during reproduction.
Further, by reproducing the video tape once recorded and then re-recording the queue signal, it is possible to selectively reproduce only the desired recording portion.

[Problems to be Solved by the Invention] As described above, in the conventional VTR, only limited queuing signals such as the number of recording modes of the VTR can be automatically recorded. There was a problem that it was limited. Further, when re-recording the queue signal after reproduction, there is a problem in that the recording takes time and a complicated operation is required.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a magnetic reproducing apparatus capable of expanding the content of selective reproduction by using an identification signal.

[Means for Solving the Problem] A magnetic reproducing apparatus according to the present invention is characterized in that an identification signal of an audio signal to be reproduced is designated and a video signal of the designated portion is reproduced. To do.

[Operation] According to the present invention, the video signal corresponding to the specified identification signal portion can be automatically reproduced by using the reproduction-selected identification signal.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings.

First, a brief description will be given of voice multiplexing in television broadcasting.

FIG. 8 is a frequency allocation diagram of a voice-multiplexed baseband signal. As shown in FIG. 8, the L + R signal of the main channel signal and the L-R signal of the sub-channel signal are multiplexed and sent, and stereo broadcasting is performed. it can. In addition, a dual audio signal is sent to the sub-channel signal during dual audio. At this time, signals of 982.5 Hz for stereo and 922.5 Hz for dual voice are sent as control signals. In the case of monaural broadcasting, the subcarrier and control signal are not sent.

FIG. 1 is a block diagram showing the structure of a VTR recording system according to an embodiment of the present invention. In FIG. 1, (8) is an antenna, (9) is a television receiver, and (10) is a video signal recording process. Circuit, (11) voice signal recording processing circuit, (12) CTL
Control signal recording processing circuit for recording on track,
(1) is a magnetic tape, (13) and (14) are guide pins for running the tape, (15) is a rotating head cylinder, and (1
6) and (17) are video signal recording / reproducing heads, and (18) and (1
9) is the audio signal recording / reproducing head, and (6) is the control signal recording / reproducing head.

Next, the operation of the above configuration will be described.

The radio wave detected by the antenna (8) is separated and output as a video signal and an audio signal by the television receiver (9). Of these, video signals are video signal recording and processing circuits (10).
The audio signal is recorded on the magnetic tape (1) by the video signal recording / reproducing heads (16) and (17), and the audio signal is recorded via the audio signal recording / processing circuit (11).
It is recorded on the magnetic tape (1) by 8) and (19). Here, an example is shown in which the audio signal is deeply recorded on the magnetic tape (1) together with the video signal.

On the other hand, the television receiver (9) detects an audio multiplex control signal, the detection signal is input to the control signal recording processing circuit (12), and the control signal recording / reproducing head (6) is supplied as a control signal including an identification signal. Is recorded on the magnetic tape (1).

This will be described in detail with reference to FIGS. 2 and 3.

FIG. 2 is a block diagram showing a specific configuration of the control signal recording processing circuit (12). As is clear from the figure,
The control signal recording processing circuit (12) is composed of an identification signal generating circuit (20) and a recording circuit (21). The identification signal generating circuit (20) changes the duty (d) of the control signal as shown in FIG. 3 (E) according to the detection result of the voice multiplex control signal, and the magnetic field is passed through the recording circuit (21). It is recorded on the magnetic tape (1) by the head (6).

In FIG. 3, (D) is a video signal, (E) is a recording control signal, and (F) is a reproduction control signal.
Duty (d) of the recording control signal (E)
For example, three types of (T1), (T2), and (T3) can be made to correspond to monaural, stereo, and dual voice, respectively.

As described above, the identification signal can be automatically recorded on the magnetic tape (1) together with the video signal and the audio signal during recording.

FIG. 4 is a block diagram showing the structure of a VTR reproducing system according to an embodiment of the present invention. In FIG. 4, (22) is a tape cassette, (23) is a video signal reproducing processing circuit, and (24) is audio. Signal reproduction processing circuit, (25) identification signal reproduction circuit,
(26) is a sequence control circuit, (27) a cathode ray tube, (28) and (29) are speakers, (30) is a keyboard for designating a selective reproduction signal, (31) is a capstan motor, and (32) is Pinch rollers, (33) and (34) are guide pins, (35) is a winding motor, and (36) is a fast feed motor. Since other configurations are the same as those shown in FIG. 1, the same reference numerals are given and their description is omitted.

Next, the operation of the reproducing system having the above configuration will be described.

The signals reproduced by the video signal recording / reproducing heads (16), (17) and the audio signal recording / reproducing heads (18), (19) are respectively a video signal reproducing processing circuit (23) and an audio signal reproducing processing circuit (24). It is returned to the original signal and sent to the cathode ray tube (27) and speakers (28) and (29) to reproduce the image and sound. At this time, a signal to be selectively reproduced is designated and input to the sequence control circuit (26) via the keyboard (30).

On the other hand, the reproduction control signal from the control signal recording / reproducing head (6) is decoded by the identification signal reproducing circuit (25) into the identification signal, and the sequence control circuit (26) is obtained.
Send to. In the sequence control circuit (26), in response to the designation input from the keyboard (30),
The capstan motor (31), the winding motor (35), and the fast-forwarding motor (36) are controlled while watching the identification reproduction signal.

This kind of selective reproduction will be described with reference to FIG.

FIG. 5G shows the magnetic tape (1) on which the identification signals (A1), (A2) and (A3) are recorded. In the figure, (A1) is a monaural signal, (A2) is a stereo signal, and (A3) is a dual signal identification signal. Here, the magnetic tape (1) records, for example, a movie program as (A3). , (A1), (A2) are commercial programs, (A
If you want to select and play only 3), send the control signal for (A3) from the keyboard (30) to the sequence control circuit (2
Input in 6) and play as shown in Fig. 5 (H). In FIG. 5 (H), (P) is a reproduction state, (S)
Indicates skip states such as speed search and fast forward.

In addition, recent VTRs can record up to 8 hours on a single tape. For example, if only the stereo program of (A2) is played back among the recorded programs as shown in Fig. 5 (I). , As shown in FIG. 5 (J). Here, it is necessary to reproduce the control signal in both the reproduction state (P) and the skip state (S), but this can be easily realized because the magnetic head (6) is a fixed head.

In the above embodiment, the example in which the duty of the control signal is changed and the identification signal is recorded is shown. However, the identification signal may be encoded and recorded in the CTL track.

The selection reproduction signal can be specified by any combination of identification signals, and may be combined with a conventional recording mode or the like.

Further, in the above embodiment, the VT provided with the recording system having the structure shown in FIG. 1 and the reproducing system shown in FIG.
Although applied to R, the magnetic recording device having only the recording system as shown in FIG. 1 and the magnetic reproducing device having only the reproducing system as shown in FIG. 4 may be separately configured.

As described above, according to the present invention, when reproducing the magnetic tape recorded on the CTL track at the same time as the video signal by converting the audio multiplex control signal into the identification signal, it is possible to specify. Therefore, it is possible to perform various combinations of selective reproduction, and it is particularly effective in reproducing images and sounds of dual audio and stereo audio.

[Brief description of drawings]

FIG. 1 is a block diagram showing the structure of a VTR recording system according to an embodiment of the present invention, FIG. 2 is a block diagram showing a concrete structure of a control signal recording circuit, and FIG. 3 is a waveform diagram showing a recording / reproducing operation. FIG. 4 is a block diagram showing the structure of a VTR reproducing system according to an embodiment of the present invention, FIG. 5 is an explanatory diagram showing a selective reproducing operation, FIG. 6 is a recording pattern diagram of a conventional video tape, and FIG. Is a waveform diagram showing a recording / reproducing operation in a conventional VTR, and FIG. 8 is a frequency arrangement diagram of a voice multiplexed signal of a television signal. (1) ... magnetic tape, (6) ... control signal recording / reproducing head, (9) ... television receiver, (10) ... video signal recording processing circuit, (12) ... control signal recording processing circuit, (16), (17) ... video signal recording and reproducing head, (20) ... identification signal generating circuit, (23) ... video signal reproducing processing circuit, (25) ... identification signal reproducing circuit, (26) ...
… Sequence control circuit, (30) …… Keyboard. The same reference numerals in the drawings indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-50472 (JP, A) JP-A-57-60551 (JP, A) JP-A-57-186249 (JP, A) Actual development Sho-55- 108532 (JP, U)

Claims (1)

[Claims] 1. A television signal including an audio multiplex signal is separated into a video signal and an audio multiplex signal, the separated video signal is recorded in a video track, and a control signal of the audio multiplex signal is an identification signal corresponding to the video signal. In a magnetic reproducing apparatus for reproducing a magnetic tape recorded as a control track, the identification signal designating means for designating an identification signal to be reproduced and a video image for reproducing a video signal corresponding to the designated identification signal portion. A magnetic reproducing apparatus comprising: a signal reproducing unit.