JPH02223049A - Video tape recorder - Google Patents

Abstract

PURPOSE:To eliminate the recording operation of a code signal at the time of dubbing by providing a first means which reads the code signal recorded on the control track of a video tape and a second means which transmits the read code signal outside. CONSTITUTION:The CTL track of the video tape for reproducing 2 is scanned by a CTL head 3 and supplied to a pulse shaping circuit 4 and a microprocessor 5. The code signal identified in the microprocessor is extracted, outputted to a code signal transmitting path 6 and supplied to a tape recorder for recording. Then, when the outputted code signal is received together with an information signal, these signals are recorded on the video tape at the same time. Thus, the information signal and the code signal of the video tape for reproducing are dubbed on the video tape for recording and the recording operation of the code signal on the video tape for recording is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video tape recorder that records a code signal on a control track for locating a recording start point on a video tape.

[Conventional technology]

Conventionally, in video tape records, when multiple programs are recorded on a video tape, in order to facilitate playback of a desired program or dubbing it with another video tape recorder, It is possible to cue the desired program.

In order to make this cue possible, a code signal is recorded on the videotape along with program information (speech), and this code signal represents the position and time on the videotape.

As such a code signal, for example,
As disclosed in Japanese Patent No. 34633 and US Pat. No. 4,167,028, time information is used to represent an absolute address on a video tape, and a control signal (hereinafter referred to as CT L (hereinafter referred to as CT L)) is used to control a video tape recorder.
It is known that the control track (hereinafter referred to as CTL track) of a videotape is recorded by modulating the signal (hereinafter referred to as No. 8). In this case, the code signal is made up of a predetermined number of bits and includes time information of hours, minutes, and seconds, and the pulse width (therefore, the duty ratio) of the CTL signal is varied depending on "l Z alQ+1" of the bits.

During playback, a CTL signal modulated with a code signal is also played back from the videotape along with an information signal, and the code signal is extracted from the CTL signal to display time information.

Therefore, by knowing the time information of the recording start position of the desired program, it becomes possible to locate the beginning of the desired program from the displayed time information.

However, according to such conventional technology, since a multi-bit complex code is used as a code signal, a complicated circuit must be used to generate and extract the code signal, and it is also necessary to use a complicated circuit to generate and extract the code signal. Since only the code signal with the information content representing the recording start position of the desired program is used for cueing, more code signals than necessary are recorded.

On the other hand, a video tape recorder is known in which a code signal can be recorded automatically or arbitrarily by a user's operation at the same time as recording of an information signal onto a video tape is started. According to this, the code signal can be recorded only at the recording start position of each program on the videotape. In this case as well, by changing the duty ratio of the CTL signal with the code signal, this code signal can be recorded on the CTL rack of the video tape.

In addition, the duty ratio of the CTL signal to be reproduced is detected,
Depending on the change, the recording start position of the program can be found.

According to this, the configuration of the code signal generation means can be simplified, and the code signal can be detected by a simple method of determining the duty ratio of the reproduced CTL signal.
This makes it possible to find the beginning of a program.

[Problem to be solved by the invention]

By the way, as mentioned above, even if a code signal is recorded on the CTL track of a videotape at each recording start position of a program,
When dubbing information signals from this videotape to another videotape, the videotape to which this information signal is dubbed (hereinafter referred to as recording videotape) In order to be able to find the beginning of a tape (called a playback videotape), a code signal must be recorded on the recording videotape along with information signals.

However, as mentioned above, in a video tape recorder in which a code signal is automatically recorded at the start of recording, the -H stop mode is set every time dubbing of one program is completed, and then the next program is started. When dubbing is performed to start dubbing, a code signal is recorded at the recording start position of each program, and there is no problem. When dubbing to recording videotape,
A code signal is recorded only for the first program to be recorded, and no code signal is recorded for the remaining programs. Even in such a video tape recorder, it is possible to record a code signal according to a user's command operation. Therefore, the recording start position of each program is found by monitoring the image during dubbing or after dubbing, and the code signal is recorded there. This is possible, but it would take a lot of effort and time.

Needless to say, in a video tape recorder that does not automatically record a code signal at the start of recording, an operation for recording the code signal is required even at the start of dubbing.

SUMMARY OF THE INVENTION An object of the present invention is to provide a video tape recorder that solves the above problems and eliminates the need for recording code signals during dubbing.

[Means to solve the problem]

In order to achieve the above object, the present invention provides means for reading a code signal from a videotape on which the code signal is recorded, and means for transmitting the read code signal to the outside.

In addition, the present invention further includes means for receiving a code signal from the outside and means for recording the received code signal on a videotape.

The code signal modulates the CTL signal to convert the video tape to CT.
L) recorded on the rack.

[Effect]

The code signal recorded on the video tape is reproduced together with the information signal from the video tape, determined to be a code signal, and output to the outside.

Furthermore, when the code signal thus output is received together with the information signal, these signals are simultaneously recorded on the videotape.

As a result, the information signal and code signal of the playback videotape are dubbed onto the recording videotape, making it unnecessary to perform an operation to stop recording the code signal on the recording videotape.

The code signal is recorded on the CTL rack of the videotape along with the CTL signal by changing the duty ratio of the CTL signal, and during dubbing, the code signal is extracted from the change in the duty ratio of the CTL signal played from the CTL track. Ru.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a video tape recorder according to the present invention, in which 1 is a video tape recorder, 2 is a video tape for playback, 3 is a CTL (control) head, 4 is a pulse shaping circuit, and 5 is a block diagram showing an embodiment of a video tape recorder according to the present invention. is a microprocessor, 6 is a code signal transmission path, 7 is a video tape recorder, 8 is a recording video tape, 9 is a CTL head, 10 is a CTL signal generation circuit, 11 is a microprocessor, and 12 is a vertical synchronization signal generation circuit. .

In the same figure, video tape recorders 1 and 7 are both video tape recorders according to the present invention, and video tape recorder 1 is used for playback, video tape recorder 7 is used for recording, and only the portion necessary for dubbing code signals is shown. It shows. These video tape recorders 1 and 7 have the same configuration. Therefore, the video tape recorder 1 is also provided with the illustrated portion of the video tape recorder 7, and the video tape recorder 7 is also provided with the illustrated portion of the video tape recorder 1. Needless to say, there are also sections.

A playback videotape 2 on which a video signal and a code signal are recorded is mounted on the playback videotape recorder 1, a recording videotape 8 is mounted on the recording videotape recorder 7, and the video of the playback videotape 2 is read. When dubbing a signal onto a recording video tape 8, a video signal transmission path 13 and an audio signal transmission path 14 are connected between these video tape recorders 1.7 as shown in FIG. A code signal transmission path 6 can be connected to the same.

Now, when the playback videotape recorder 1 is set to the playback mode and the recording videotape recorder 7 is set to the recording mode, the video signal and audio signal played back from the playback videotape 2 by the playback videotape recorder 1 are respectively It is supplied to the recording video tape recorder 7 through the video signal transmission line 13 and the audio signal transmission line 14, and the recording video tape 8 is supplied to the recording video tape recorder 7.
recorded in As a result, dubbing from the reproduction videotape 2 to the recording videotape 8 is performed.

On the other hand, the playback videotape 2 is provided with a CTL rack on which CTL signals are recorded.
TL) Code signals are recorded on the rack at positions corresponding to the recording start position of each program, and these code signals can be used to locate the beginning of each program. This code signal modulates the CTL signal by changing the duty ratio of the CTL signal, and is recorded on the CTL track together with the CTL signal.

Therefore, when the video tape recorders 1 and 7 are set to the above-mentioned modes and dubbing is started from the playback videotape 2 to the recording videotape 8, the CTL track of the playback videotape 2 is scanned by the CTL head 3. be done. As a result, the CTL signal is regenerated, and the waveform is shaped by the pulse shaping circuit 4. The CTL signal output from the pulse shaping circuit 4 is supplied on one hand to a servo system (not shown) and used for running control of the video tape 2 for reproduction, and on the other hand is supplied to the microprocessor 5. The microprocessor 5 detects the duty ratio of the supplied CTL signal, identifies the code signal from the change in the duty ratio, extracts the identified code signal, and sends it to the code signal transmission line 6 in a predetermined signal format. is output to.

This code signal is supplied to a recording video tape recorder 7 through a code signal transmission line 6. In this recording video tape recorder 7, when the microprocessor 11 receives a signal in the above signal format, it determines it to be a code signal and encodes it into a signal format that can modulate the CTL signal.

On the other hand, the vertical synchronization signal generation circuit 12 extracts a vertical synchronization signal from the video signal supplied from the reproduction video tape recorder 1 and supplies it to the CTL signal generation circuit 10. C.T.L.
In the signal generation circuit 10, a CTL signal with a predetermined duty ratio is generated from the supplied vertical synchronization signal, and when an encoded code signal is output from the microprocessor 11, the duty ratio of the CTL signal is changed by this code signal. be done. The CTL signal modulated by the code signal in this way is supplied to the CTL head 9,
CTL of recording videotape 8) is recorded on the rack.

In the above manner, the CTL is transferred from the playback videotape 2 to the recording videotape 8 together with the video signal and the audio signal.
The code signal recorded on the track is also dubbed at the same time. Therefore, during dubbing, there is no need to perform an operation for recording the code signal on the recording video tape 8.

Since the video tape recorders 1.7 have the same configuration, they can be used for either recording or playback, and the microprocessors 5.11 can have the same functions.

In addition, when both the video tape recorders I and 7 are used for recording, the video tape recorders I and 7 can be used to record the video tape by the user's operation.
TL) It goes without saying that a code signal for cueing can be recorded on the rack. In this case, the operation is similar to that described above for the video tape recorder 7, except that the microprocessor 11 is supplied with a code signal by the user's operation.

Furthermore, the signal formation of the code signal transmitted through the code signal transmission path 6 is arbitrary, and the code signal may be transmitted by being superimposed on the video signal or audio signal by frequency division multiplexing or time division multiplexing. You can do it like this.

Furthermore, the code signal is not limited to the recording start position of the program, but may also be a code signal representing each position on the videotape as described in the above-mentioned utility model publication and US patent specification. .

〔Effect of the invention〕

As described above, according to the present invention, it is possible to dub not only a video signal and an audio signal but also a code signal at the same time, and there is no need for a user's operation to record the code signal during dubbing.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a video tape recorder according to the present invention, and FIG. 2 is a system configuration diagram when the video tape recorder according to the present invention is used for dubbing. 1...... Video tape recorder for playback, 2
......Video tape for playback, 3...
... Control head, 5 ... Microprocessor, 6 ... River ... Code signal transmission line,
7... Recording videotape recorder, 8
...... Recording videotape, 9...
...Control head, 10...
Control signal generation circuit, 11...Microprocessor.

Claims (1)

[Claims] 1. In a video tape recorder for recording and reproducing desired information signals on a video tape, a first means for reading a code signal recorded on a control track of the video tape; A video tape recorder comprising: second means for transmitting the code signal to the outside. 2. The video tape according to claim 1, further comprising: third means for receiving a code signal from the outside; and fourth means for writing the received code signal into a control track of the videotape. Tape recorder. 3. The video tape recorder according to claim 1 or 2, wherein the code signal is recorded on the control track by modulating a control signal.