JPS63167403A - Dubbing device for video tape - Google Patents

Abstract

PURPOSE:To perform the dubbing of a control signal, by providing a dubbing circuit for the control signal in which a control signal reproducing amplifier circuit in a master deck part is connected to a control signal recording amplifier circuit in an editor deck part. CONSTITUTION:The dubbing of a video signal and an audio signal is performed by connecting the video output part 11 of the master deck part 10 to the video input part 21 of the editor deck part 20, or connecting the audio output part 12 to the audio input part 22, respectively. Meanwhile, the dubbing of the control signal is performed in such way that the control signal is reproduced from the master tape of the deck part 10 with a control head 13, and also, a signal processing is applied on the control signal by the reproducing amplifier circuit 2, and the output of the circuit 2 is supplied to the recording amplifier circuit 3 in the deck part 20 via an interface 4 provided at need. And recording is performed from the circuit 3 via a control head 23. In such a way, it is possible to perform the dubbing of the control signal reproduced at the deck part 10 on the raw tape of the deck part 20.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a videotape dubbing device having a control signal dubbing function.

[Prior art and its problems]

FIG. 4 shows a tape pattern of a video tape used in a home video tape recorder typified by the VHS standard.

The video tape (40) shown in the figure has a video track (41) on which a video signal is recorded by a helical scan method in the center portion in the width direction, and an audio signal and a control signal are recorded on both ends of this video track (41). It has an audio track (42) and a control track (43), respectively.

By the way, the control track (43) has <1> based on the vertical synchronization signal separated from the video signal during recording.
A control pulse every /30 seconds is recorded, and during reproduction, the control pulse is reproduced and used as a reference signal for the servo system. For this reason, conventional dubbing devices output only video and audio signals from the mask deck section (playback side), record the video signals and audio signals at the editor deck section (recording side), and record the reproduced video signals. From the signal, the editor deck section generated its own control signal and recorded it on raw tape.

As described above, since conventional dubbing devices do not have a control signal dubbing function, information other than the original control signal, such as unique information for automatic cueing, is multiplexed and recorded on the control track (43). In this case, there is a problem that this information cannot be dubbed. Therefore, when dubbing such a videotape, it is necessary to separately record new cue information (signal) after dubbing the video signal and audio signal, which requires a large amount of time for dubbing. There was also the problem that dubbing mistakes were easy to occur.

[Means for solving problems]

The present invention aims to provide a new videotape dubbing device that solves the problems existing in the prior art described above, and is achieved by the following dubbing device (1).

That is, the dubbing device (1) according to the present invention has an output section of a control signal reproducing amplification circuit (hereinafter referred to as a reproducing amplifying circuit) (2) in a master deck section (10) and a control signal recording amplification circuit in an editor deck section (20). A control signal dubbing circuit (hereinafter referred to as the dubbing circuit) (5) connected to the human power section of the circuit (hereinafter referred to as the recording amplifier circuit) (3) directly or via an interface (4).
).

[For production]

Next, the operation of the present invention will be explained.

The dubbing device (1) according to the present invention performs dubbing of video signals and audio signals using a master deck ffi (
10) Video output section and editor deck IIE (20)
).

The video input section of the master deck section (1o) and the audio input section of the editor deck section (2o) are connected to the video input section of the master deck section (1o).

On the other hand, dubbing of the control signal is performed by the dubbing circuit (5
). That is, the control head reproduces a control signal from the master tape of the master deck section (10), and the control signal is subjected to signal processing such as amplification by the reproduction amplifier circuit (2), and further the output of the circuit (2) is The signal is supplied to the recording amplifier circuit (3) in the editor deck section (20) via an interface (4) provided as necessary, and after signal processing such as predetermined amplification is performed in this circuit (3), it is applied to the control head. and record it. Therefore, the master deck part (10
) can be dubbed to the raw tape of the editor deck section (20).

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings.

Fig. 1 is a block circuit diagram of the main parts of a dubbing device according to the present invention, Fig. 2 is a time diagram of signals in each part in Fig. 1, and Fig. 3 is an example of an interface used in the dubbing device. FIG.

First, referring to FIG. 1, a dubbing device (1
) configuration will be explained.

This dubbing apparatus (1) includes a pair of video decks consisting of a master deck section (10) and an editor deck ffi (20). The master deck section (10) has at least a master tape playback function, and includes a video output section (11) and an audio output section (12). On the other hand, the editor deck section (20) has at least a recording function for raw tape, and has a video input section (21) and an audio input section (20).
2). The video output section (11) and video input section (21) are connected by a connection cord (7), and the audio output section (12) and audio input section (22) are connected by a connection cord (6).

The master deck unit (10) also includes a regenerative amplifier circuit (2) that performs signal processing such as amplification and waveform conversion on the reproduced signal (Sl) obtained from the control head (13) and outputs a predetermined control pulse (S2). ), and on the other hand,
The editor deck section (20) is equipped with a recording amplification circuit (3) that performs signal processing such as amplification on input control pulses and applies them to the control head (23).

The output section of the reproduction amplification circuit (2) and the input section of the recording amplification circuit (3) are connected via an interface (4) to form a dubbing circuit (5). This interface (4) performs signal conversion on the control pulse (S2) when the standards of the two deck sections (10) and (20) are different. Therefore, it is not necessary if the output of the main amplifier circuit (2) can be directly used as an input to the recording amplifier circuit (3).

Next, the function of the dubbing circuit (5) will be explained.

Now, put the master tape on the master deck part (10), and
Assume that a raw tape is loaded into the editor deck section (20) and dubbing is performed from the master tape to the raw tape. In this case, first, the control head (13) of the master deck section (10) sends a reproduction signal (S) shown in FIG.
l) is obtained. In the regenerative amplifier circuit (2), the regenerative signal (Sl)
The signal processing is performed to generate and output the control pulse (S2) shown in FIG. Control pulse (S2)
is supplied to the interface (4), and after the pulse voltage is changed, for example, is supplied to the recording amplification circuit (3). A control pulse (S3) output from this interface (4) is shown in FIG. 2(C). Note that the functions of the illustrated interface (4) can be realized by the circuit configuration shown in FIG. In the figure, (31) is the input part of the interface (4), (32) is the output part of the interface (4), and (33) is the input part of the interface (4).
), (34), and (35) are resistors, (36) is an inverter, and (37) is a transistor. This interface (4) performs signal conversion of control pulses, and can be configured into any circuit, and may be of the form % type with optional additional circuits such as a phase compensation circuit added as necessary.And the recording amplifier circuit (3) ) is supplied to the control head (23) and dubbed onto the raw tape. In other words, the control signal is not generated based on the video signal on the editor deck section (20) side, but the control signal played from the master tape on the master deck section (10) side is directly generated on the editor deck section (20) side. It will be recorded on raw tape.

The control pulse shown in FIG. 2 has information such as an index code and address code added to the original control signal by changing the duty ratio of the pulse, and is used for automatic cueing, etc.

Furthermore, when this dubbing device (1) is used, video tapes with confidential content can be easily created. In other words, if a unique control signal is recorded on the control track, a conventional video deck will be protected against copying and cannot be reproduced and recorded, but dubbing will only be possible with this device (1).

Although the embodiments have been described in detail above, the present invention is not limited to these embodiments.

For example, although the case where the control signal is multiplexed by changing the duty ratio of the control pulse is shown, the case where information is multiplexed in any other format is also included. Further, the reproduction amplification circuit and the recording amplification circuit only need to have a function as a head amplifier for the control head, and their circuit configurations are arbitrary.

Furthermore, each deck portion may be an integrated dubbing device, or independent decks may be connected to each other to provide a dubbing function.

Other changes may be made in the detailed structure, quantity, etc., without departing from the gist of the present invention.

〔Effect of the invention〕

As described above, the dubbing device according to the present invention includes a dubbing circuit in which the output section of the control signal reproduction amplification circuit in the master deck section and the input section of the recording amplification circuit in the editor deck section are connected directly or via an interface. get an effect like

■It is now possible to dub the control signal at the same time as the video signal and audio signal, and even if other information is multiplexed on the control signal, all dubbing can be done quickly and easily with -1 dubbing. , misdubbing is also eliminated.

■Since it can be used as is by simply adding an interface to a conventional video deck or dubbing device, it is excellent at low cost and easy to manufacture.

[Brief explanation of the drawing]

Fig. 1.2 A block circuit diagram of the main parts of the dubbing device according to the present invention. Fig. 2: A time chart diagram of signals in each part in Fig. 1. Fig. 3: An example of an interface used in the dubbing device. Electrical circuit diagram, Figure 4: Diagram showing the tape pattern of videotape. In the drawings, (1): dubbing device (2): control signal reproduction amplification circuit, (3): control signal recording amplification circuit, (4): interface (10): master deck section (20): editor deck section patent Applicant: Japan TMI Co., Ltd. Representative Patent Attorney 1) Shigeru Figure 1 Figure 2

Claims (1)

[Claims] In a videotape dubbing device in which a master deck section and an editor deck section are connected, the output section of the control signal reproducing amplification circuit in the master deck section and the input section of the control signal recording amplification circuit in the editor deck section are connected directly or through an interface. A dubbing device for videotape, characterized in that a dubbing circuit for control signals is connected to the dubbing circuit.