JPH0546023B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to dubbing of magnetic tape, in which a program reproduced from a master tape is repeatedly and continuously recorded on a long unrecorded magnetic tape, and when this recording is completed, a long unrecorded magnetic tape is recorded. While winding the magnetic tape, it is cut in program units according to the cue signal being played back, and each cut recorded magnetic tape is loaded into the cassette case, thereby ensuring that the video signals repeatedly played back from the master tape are uniform and uniform. An object of the present invention is to provide a magnetic tape dubbing device capable of obtaining a high-quality dubbed magnetic tape.

Conventionally, when manufacturing a large number of soft tapes by dubbing audio and video signals (hereinafter simply referred to as "video signals") reproduced from a master tape onto cassette-type magnetic tapes such as VHS format, As shown in Figure 1, an unrecorded magnetic tape (hereinafter referred to as "raw tape") with a length of several thousand meters
After steps A and B of creating a plurality of cassette tapes in which magnetic tape of a desired length is wound, a step C of dubbing the video signal of the master tape is performed on each cassette tape, and the recording on each cassette tape is started and In order to inspect the recording condition near the end of recording, a rear cassette tape inspection process D, a rewinding process E, and a front cassette tape inspection process F are performed, followed by a labeling and case placement process G and a finishing process H. was. If the recording time of the program recorded on each cassette tape matches that of a commercially available unrecorded cassette tape, you can use this commercially available cassette tape, but if they do not match, there will be excess magnetic tape. This would be uneconomical, and in order to avoid surplus, cassette tapes were made using magnetic tapes that matched the recording time of the program. Therefore, when the number of cassette tapes on which the same program is recorded is small, the efficiency is low. Furthermore, individual cassette tapes have variations such as warping of the casing and bending of the shaft of the guide roller, and these variations affect the recording quality, so a large amount of man-hours are required to check the quality after recording. It is necessary to inspect the recording state of the cassette tape near the start and end points of recording. Another disadvantage is that since recording is performed using a cassette tape, a cassette tape rewinding step E is required in order to locate the beginning of recording. Furthermore, there is a risk of damaging the housing when loading and unloading the cassette tape into the recording device, and automating cassette tape recording requires a lot of work in terms of loading and unloading the cassette, transport equipment, storage space for the cassette tape, etc. Furthermore, if the program to be recorded on the cassette tape is short, the ratio of the time for loading and unloading to the recording time becomes large, resulting in poor efficiency.
Another drawback is that since the master tape is repeatedly played back, the master tape must be provided with a track on which control signals are recorded in order to control the playback position.

The present invention eliminates the above-mentioned drawbacks, and one embodiment thereof will be described with reference to FIG. 2 and the following figures.

FIG. 2 shows a process diagram of one embodiment of a duplication process using the magnetic tape dubbing apparatus according to the present invention.
In the figure, a long raw tape wound with several thousand meters of unrecorded magnetic tape records one or more programs reproduced from a master tape repeatedly and continuously without being interrupted. (Process). After the long recorded tape has been recorded, the recording condition near the end of recording is inspected in step J to see if the gap in the recording head has not become clogged during recording, and then the recording tape is inspected from one end of the tape where recording has been completed. The tape is wound up and cut into program units (step K), and recorded cassette tapes are assembled from the cut recorded tapes (step L). A portion of the plurality of recorded cassette tapes produced in this way is extracted and their recording condition is inspected (process M), and in the next process G, a label and program name are printed on each recorded cassette tape. A sticker is attached, the product is placed in a case, and the product goes through finishing process H before being shipped.

Continuous dubbing, which is the main part of the method of the present invention shown in FIG. 2, is performed by the apparatus shown in FIG.

FIG. 3 shows a block system diagram of one embodiment of the device of the present invention. In the figure, 1 is a reference signal generator,
Based on a constant frequency signal generated by a built-in oscillator, a vertical synchronization signal and a horizontal synchronization signal of the NTSC color system are generated and supplied to the playback devices 2 and 3, as well as a vertical synchronization signal, a horizontal synchronization signal, and a color burst signal. A black burst signal containing no image signal is generated and supplied to the switch circuit 4 and the frame pulse generation circuit 5. The playback devices 2 and 3 are controlled by a playback control signal from a control device 6 to be installed later, and either one plays back the master tape in synchronization with the vertical synchronization signal and horizontal synchronization signal from the reference signal generator 1. . The video signals reproduced by the reproduction devices 2 and 3 are supplied to a switch circuit 4 and a frame pulse generation circuit 5, respectively. The frame pulse generation circuit 5 divides the vertical synchronization signal of the black burst signal by 1/2 to obtain a pulse width of approximately 1 μs or more.
The control device 6 generates a first frame pulse of several μs.
At the same time, the frequency of the vertical synchronization signal of the video signal from the playback device 2 or 3 is divided by half to generate a second frame pulse with a pulse width of approximately 1 μs to several μs, and the generated second frame pulse is supplied to the control device 6. .

The control device 6 constantly counts the first frame pulse generated from the black burst signal, and also counts the second frame pulse when the reproduction devices 2 and 3 are in the reproduction mode, and counts the first or second frame pulse.
By comparing the count value of frame pulses with the value pre-recorded in the memory built into the control device 6, a playback control signal is generated to control playback start, stop, rewind, etc. of each of the playback devices 2 and 3. Also, a switch control signal for controlling switching of the switch circuit 4 is supplied to the switch circuit 4 to start and stop recording of the recording devices 7, 8, and 9 and to record the recorded tape. A recording control signal for controlling the recording of a queue signal, which is an inter-program detection signal for instructing the cutting position, is supplied to the recording devices 7, 8, and 9. Further, the switch circuit 4 takes out the signal instructed by the switch control signal from among the video signals, black and burst signals supplied from the playback devices 2 and 3, and sends it to the distributor 10.
supply to. The distributor 10 supplies the signal from the switch circuit 4 to the recording devices 7, 8, and 9, respectively. Each of the recording devices 7, 8, and 9 has a built-in cue signal generator, and records the video signal, black burst signal, and cue signal from the playback devices 2, 3 on the raw tape set in each of them.

Next, one embodiment of the dubbing order of the magnetic tape by the apparatus shown in FIG. 3 will be described. The control device 6 generates a switch control signal for selecting a black burst signal, and also generates a recording control signal indicating the start of recording, and controls the magnetic field shown in FIG. 4 set in each of the recording devices 7, 8, and 9. The black burst signal is recorded on the video signal recording portion of the tape 11. As a result, the portion 11a on the magnetic tape 11
A black burst signal is recorded. When the count value of the first frame pulse reaches a set value, the control device 6 starts playing the playback device 2, controls the switch circuit 4 to select the video signal from the playback device 2, and controls the video signal on the portion 11b on the magnetic tape 11. Playback device 2
More video signals are recorded. When the control device 6 detects that the playback of the master tape of the playback device 2 will soon end based on the count value of the second frame pulse based on the video signal of the playback device 2, the control device 6 causes the playback device 3 to start playing, and the playback device Controls the switch circuit 4 to select the video signal from the playback device 3 at the same time as the playback of the master tape No. 2 is completed;
After that, the master tape of the reproducing device 2 is rewound. As a result, the video signal from the reproducing device 3 is recorded on the portion 11c on the magnetic tape 11 consecutively with the video signal from the reproducing device 2.

When the control device 6 detects from the count value of the second frame pulse that the playback of the master tape in the playback device 3 has ended and the first dubbing of the program has ended, the switch circuit 4 selects the black burst signal. Then, the master tape of the playback device 3 is rewound. The control device 6 generates a queue signal to the recording devices 7, 8, and 9 when a predetermined number of first frame pulses arrive after the counting of the second frame pulses is interrupted;
This cue signal is superimposed on the black burst signal and recorded on the raw tape 11. The cue signal, which is the inter-program detection signal, has a repetition frequency of 10 to 20 Hz, and is a pulse having a level that saturates the magnetic tape during the high level period. The control device 6 stops the generation of the cue signal after the recording devices 7, 8, and 9 generate the cue signal for a predetermined period of time, and further outputs a black burst signal while a predetermined number of first frame pulses are received. After that, control is performed to record the video signal from the playback device 2 again, and the above control is repeated thereafter. A black burst signal is recorded on a portion 11d on the magnetic tape 11 shown in FIG.
In part 11e, a cue signal is recorded superimposed on the black burst signal, and in part 1
In 1f, a video signal from the reproduction device 2, which is the second dubbing of the program, is recorded.

The long recorded tape recorded in this way by the apparatus shown in the third figure is wound up from one end where recording has been completed without being rewound. During this winding, the long pre-recorded tape is brought into contact with only the video signal recording area (or slightly raised above the tape), excluding the audio signal and control signal recording area.
Then, only the recorded portion of the video signal is reproduced by a magnetic head having a cutoff frequency _H expressed by the following equation.

2f _cue・N≦f _H …(1) f _H <f _V …(2) Here, _cue is the repetition frequency of the cue signal,
N is the double speed of the tape running speed during winding compared to the tape running speed during recording, and _V is the lowest frequency of the video signal (not including the audio signal). For this reason, only the cue signal is reproduced by this magnetic head, and when several pulses of this cue signal are reproduced in succession, for example, a certain point on a pre-recorded tape will be at the position that the magnetic head passes after being reproduced. The provided cutter operates to cut the recorded tape. The broken line in FIG. 4 indicates the tape cutting position, and the broken line indicates the part 11 where the cue signal is recorded.
The distance a to one end of e is less than several centimeters.
As shown in FIG. 5, a leader tape 12 is adhered to the left side of this tape cut part and is assembled into a cassette housing (not shown), but the recorded tape 11 of this cassette is played back by a playback device (not shown). The reproducible portion is to the right of the dashed line in FIG. 5, and the queue signal recording portion 11e is never reproduced.

In the above embodiment, the video signals of the playback devices 2 and 3 are consecutively set as one program, but for example, the video signal of the playback device 2 and the video signal of the playback device 3 may be separate programs. Further, the number of playback devices may be one or three or more, the number of recording devices may be one, two, or four or more, and the second frame pulse is transmitted to the playback devices 2 and 3.
Reproduction may be performed using a different control signal, and the present invention is not limited to the above embodiment. Here, if there is only one playback device 3 (for example, only playback device 2), the control device 6 stops the recording devices 7, 8, and 9 when the playback device 2 finishes playing, and the playback device 2 finishes rewinding. After that, the recording devices 7, 8, and 9 are started to record.
After recording the black burst signal, recording the black burst signal superimposed with the cue signal, and recording the black burst signal, the reproducing device 2 starts reproducing and records this video signal.

The tape cutting position shown in FIG. 4 is for the VHS system, but in other systems, this cutting position may be within the portion 11d on the right side of the portion 11e.

As described above, the magnetic tape dubbing device according to the present invention repeatedly and continuously records a program reproduced from a master tape onto a long unrecorded magnetic tape, and after recording is completed on a long recorded magnetic tape. A magnetic tape dubbing device that winds up a magnetic tape, cuts it in program units according to a reproduced cue signal, and loads each cut recorded magnetic tape into a cassette case, which receives a vertical synchronization signal, a horizontal synchronization signal, a reference signal generator that outputs black burst signals, a playback device that outputs playback signals obtained by playing back the master tape in synchronization with the vertical synchronization signal, the horizontal synchronization signal, and the playback control signal, respectively; and the black burst signal. a frame pulse generation circuit that generates and outputs a first frame pulse based on the vertical synchronization signal of the reproduction signal and a second frame pulse based on the vertical synchronization signal of the reproduction signal; and a frame pulse generation circuit that sequentially switches and outputs the reproduction signal and the black burst signal using a switch control signal. a switch circuit that sequentially records the reproduction signal and the black burst signal on the long unrecorded magnetic tape in synchronization with a recording control signal, and the black burst signal recorded on the long recorded magnetic tape; a recording device that superimposes and records the cue signal on a signal; and a recording device that generates the switch control signal, and generates the playback signal obtained by comparing a predetermined setting value with a count value obtained by counting each of the first and second frame pulses. a control device that generates a control signal and performs recording start/stop control of the black burst signal, recording start/stop control of the playback signal, and generation control of the queue signal; The cutoff frequency f _H of the magnetic head that reproduces the cue signal is 2f _cue・N≦f _H <f _V (where f _cue is the repetition frequency of the cue signal,
N is the magnetic tape running speed at the time of recording compared to the magnetic tape running speed at the time of winding, _fV is the lowest frequency of the video signal), so a control track is installed on the master tape to control the playback position of the master tape. The magnetic tape recorded in this way can be cut by detecting the beginning and end of each video signal, and the video signal of the master tape can be recorded on each of the magnetic tapes recorded in this way. In addition, the recorded state of each cut magnetic tape is uniform without being affected by variations in the cassette housing, etc., and furthermore, it can be applied to a dubbing method for obtaining a long unrecorded magnetic tape. Since it is equipped with a recording device that records the playback device signal and black burst signal from the playback device, and also records the cue signal superimposed on the black burst signal, there is no difference between each program continuously recorded on a long pre-recorded magnetic tape. Since only the black burst signal is recorded and there are no signalless sections between each program, even if this recorded magnetic tape is played back, the image signal and the black burst signal (vertical and horizontal synchronization signals) are not recorded. , a color burst signal that does not include an image signal) is played back, so if you play a magnetic tape that has no-signal bands between each program, as in the case of conventional tapes, this signal will be generated due to the playback of these no-signal bands. This makes it possible to completely eliminate the so-called snow noise, which can provide high marketability that cannot be obtained with private dubbing.Furthermore, the queue signal is continuous in the magnetic head of the recording device. The recorded magnetic tape is cut near the position where it will be played back, the recorded magnetic tape is wound up and cut in units of programs, and each cut recorded magnetic tape is loaded into a cassette case to assemble the recorded cassette tape. The cue signal is placed in a position where it will not be played back after the cassette is installed, thereby avoiding the negative effects of the cue signal.Furthermore, the program played from the master tape is repeatedly and continuously recorded on a long unrecorded magnetic tape. Compared to a dubbing device that loads a pre-recorded magnetic tape into a cassette casing each time a program is dubbed, this system eliminates the need to load a cassette cassette each time a program is dubbed, allowing long-term unattended operation. There are other effects.

[Brief explanation of the drawing]

Fig. 1 is a process diagram of an example of a conventional magnetic tape duplication method, Fig. 2 is a process diagram of an embodiment of a duplication process using the present invention, and Fig. 3 is a block diagram of an embodiment of the apparatus of the present invention. The system diagram, FIGS. 4 and 5 are diagrams schematically showing recording signals on a magnetic tape recorded by the apparatus shown in FIG. 3. 1... Reference signal generator, 2, 3... Reproduction device,
4... Switch circuit, 5... Frame pulse generation circuit, 6... Control device, 7, 8, 9... Recording device, 10... Distributor, 11... Magnetic tape, 12
...Leader tape.

Claims (1)

[Claims] 1. A program reproduced from a master tape is repeatedly and continuously recorded on a long unrecorded magnetic tape, and the program is played back while winding the long recorded magnetic tape after the recording is completed. A magnetic tape dubbing device that cuts programs in accordance with a queue signal and loads each cut recorded magnetic tape into a cassette housing, and has standards for outputting a vertical synchronization signal, a horizontal synchronization signal, and a black burst signal, respectively. a signal generator; a playback device that outputs playback signals obtained by playing back the master tape in synchronization with the vertical synchronization signal, the horizontal synchronization signal, and the playback control signal, respectively; a first frame pulse based on the black burst signal; a frame pulse generation circuit that generates and outputs second frame pulses based on the vertical synchronization signal of the reproduction signal; a switch circuit that sequentially switches and outputs the reproduction signal and the black burst signal using a switch control signal; and a recording control signal. The reproduction signal and the black burst signal are synchronously recorded in sequence on the long unrecorded magnetic tape, and the cue signal is superimposed and recorded on the black burst signal recorded on the long recorded magnetic tape. a recording device; generating the switch control signal; generating the reproduction control signal obtained by comparing a predetermined setting value with a count value obtained by counting each of the first and second frame pulses; Start recording burst signal
a control device that generates the recording control signal that performs recording stop control, recording start/recording stop control of the playback signal, and generation control of the queue signal, and the cutoff frequency f _H of the magnetic head that reproduces the queue signal is , 2f _cue・N≦f _H <f _V (however, f _cue is the repetition frequency of the cue signal,
A dubbing device for a magnetic tape, characterized in that N is twice the running speed of the magnetic tape at the time of recording compared to the running speed of the magnetic tape at the time of winding, and _fV is the lowest frequency of the video signal.