JPS58171725A - Dubbing method of magnetic tape - Google Patents

Abstract

PURPOSE:To simplify the working process to automatize the dubbing method, by recording continuously an inter-program part detecting signal on a magnetic tape and detecting this signal from the recorded magnetic tape to cut it. CONSTITUTION:When a CPU6 detects the end of the first dubbing of a program on a basis of the counted value of the second frame pulses, the CPU6 performs such control that a switch 4 takes out selectively a black burst signal, and thereafter, a master tape of a reproducing device 3 is rewound. When a prescribed number of the first frame pulses come after the counting of the second frame pulses is interrupted, the CPU6 superposes cue signals of recording devices 7-9 to the black burst signal and records them onto an original tape 11. After cue signals are generated for a prescribed time, the CPU6 stops the generation of these signals, and the black burst signal is recorded while a prescribed number of the first frame pulses come, and thereafter, the video signal from a reproducing device 2 is recorded again.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic tape dubbing method, in which a program-to-program detection signal is inserted between programs to record continuously on a magnetic tape, and the recorded magnetic tape is The present invention aims to provide a magnetic tape dubbing method in which each magnetic tape is of uniformly high quality by detecting a detection signal and cutting the tape, and the work process is simplified and automated.

Conventionally, audio signals and video signals (hereinafter simply referred to as "video signals") reproduced from a master tape are, for example, VH8
When manufacturing a large number of soft tapes by copying (dubbing) them onto cassette-type magnetic tapes such as those using the same method, as shown in Figure 1, an unrecorded magnetic tape (hereinafter referred to as "raw tape") with a length of several thousand meters is used. After steps A and B of making a plurality of cassette tapes each having a desired length of magnetic tape wound thereon, a step O is performed in which a video signal is dubbed onto the master tape for each cassette tape, and the recording starts and ends on each cassette tape. In order to inspect the recording status near the end of recording,
The rear cassette tape inspection process 91, the rewinding process E1, the front cassette tape inspection process R, and then the V-pel pasting and case insertion process G1, and the finishing process H were performed.

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 it does not match, the magnetic tape will be left over. This would be uneconomical, and in order to avoid surplus, cassette tapes were made using magnetic tape to match the recording time of the program. Therefore, when the number of cassette tapes on which the same program is recorded is small, the efficiency becomes poor. In addition, individual cassette tapes have variations such as warping of the casing and bending of the shaft of the guide roller, and since these variations affect the recording quality, 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. Furthermore, since recording is performed using a cassette tape, there is a drawback that a cassette tape rewinding step E is required to locate the beginning of recording. In addition, there is a risk of damaging the cassette tape when loading and unloading it into a recording device.Furthermore, automating cassette tape recording requires the loading and unloading mechanism, transport equipment, storage space for the cassette tape, etc. In addition, when the program to be recorded on a cassette tape is short, the ratio of the time for loading and unloading to the recording time becomes large, resulting in poor efficiency.

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 the magnetic tape dubbing method according to the present invention. In the figure, a long raw tape with several thousand meters of unrecorded magnetic tape wound around it is played back from a master tape without being cut in the middle, or multiple programs are repeatedly recorded in succession. (engineering). After the recording has been completed, the recording state of the recording head near the end of the recording is inspected in step J to see if the gap in the recording head has become clogged during the recording, and then the end of the long edge tape where the recording has been completed is inspected. The tape is wound up and cut into program units (step K), and a low recording cassette tape is assembled from the cut edge tapes (step L).

A portion of the plurality of low-recording cassette tapes manufactured in this way is extracted and its recording state is inspected (Step M).
In the next step G, each low-recording cassette tape is pasted with a label and a sticker with the program name printed on it, placed in a case, and then shipped after a finishing step H.

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 a dubbing device used in the present invention. In the figure, 1 is a reference signal generator, which generates, for example, an NTSO color one-sided vertical synchronization signal and horizontal synchronization signal based on a constant frequency signal generated by a built-in oscillator, and supplies the generated signals to the playback device 2.3. At the same time, a black burst signal consisting of a vertical synchronization signal, a horizontal synchronization signal, and a color burst signal and 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 side control signal from a central processing unit C (hereinafter referred to as a CPU) 6, which will be described later. Playback in synchronization with the horizontal sync signal. The video signals reproduced by the reproduction device 2.3 are supplied to the switch N path 4 and the frame pulse generation circuit 5, respectively.

The frame pulse generation circuit 5 divides the vertical synchronization signal of the black burst signal by 172 and supplies a first frame pulse with a pulse width of about 1μ8 to several μm to the generation circuit 0PUI, and also separately generates a first frame pulse from the reproduction device 2 or 3. The vertical synchronization signal of the video signal is divided by 1/2 and the pulse width is approximately 1μS to several μθ
generates a second frame pulse and supplies it to apty@.

0PUII constantly counts the first frame pulse generated from the black burst signal, and when the reproduction devices 2 and 3 are in the reproduction mode, counts the second frame pulse L7, the first or second frame pulse. By comparing the pulse count value with the value stored in advance in the built-in memory of the CPU @, the reproduction of each of the reproduction devices 2 and 3 is started;
A playback control signal that controls stop, rewind, etc. is generated and supplied to the playback device 2, and a switch control signal that controls switching of the switch circuit 4 is supplied to the switch circuit 4, which will be described later. , s, start and stop recording of s,
A recording control signal for controlling the recording of a cue signal, which is an inter-program detection signal for instructing the cutting position of the recorded tape, is supplied to the recording device 7.8.9. Further, the switch circuit 4 extracts the signal instructed by the switch control signal from among the supplied video signal and black burst signal from the reproduction device 2.3, and supplies it to the distributor 10. The distributor 10 supplies the signal from the switch circuit 4 to each of the recording devices y, a, and s. The recording devices y, a, and s each have a built-in cue signal generator, and record the video signal, black burst signal, and cue signal from the playback device 2#3 on the raw tape set in each recording device.

Next, an example of the dubbing order of the magnetic tape by the apparatus shown in FIG. 3 will be described. The CPU @ generates a switch control signal to select the black burst signal, and also generates a recording control signal to indicate the start of recording, and controls the recording device? , 8
．． The black burst signal is recorded on the video signal recording portion of the magnetic tape 11 shown in FIG.

As a result, a black burst signal is recorded on the portion 11L on the magnetic tape 11. cpυ6 starts playing the playback device 2 when the count of the first frame pulse reaches a set value, controls the switch circuit 4 to select the video signal from the playback device 2, and plays it back onto the portion 111) on the magnetic tape 11. The video signal from device 2 is recorded. When 0PUli detects that the playback of the master tape of the playback device 2 will soon end from the count value of the second frame pulse based on the video signal of the playback device 2, it causes the playback device 3 to start playing, and then starts the playback of the playback device 2. At the same time as the playback of the master tape is completed, the switch circuit 4 controls to select the video signal from the playback device 3, and then causes the playback device 2 to rewind the master tape. As a result, the portion 110 on the magnetic tape 11
Then, Eirin I δ from playback device 2 and playback device 3 are played continuously.
More video signals are distributed.

0PUII indicates that the playback of the master tape of the playback device 3 is completed based on the count value of the second frame pulse, and the program 1 is started.
When it is detected that the second dubbing has been completed, the switch circuit 4 controls to select and extract the black burst signal, and then causes the reproducing device 3 to rewind the master tape. 0? U@ generates a cue signal in the recording devices y, s, and s when a predetermined number of first frame pulses arrive after counting of the second frame pulse is interrupted, and this cue 4
No. 6 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 79 H2 and is a pulse having a level that saturates the magnetic tape during the high level period. 0PUli is recording device y, a, s
After generating the cue signal for a predetermined period of time, it stops generating the cue signal, and further records a black burst signal while a predetermined number of first frame pulses are received, and the playback device 2 again outputs the cue signal. Control is performed to record more video signals, and the above control is repeated thereafter.

The portion 11 (IK) on the magnetic tape 11 shown in FIG. The video signal from the playback device 2, which is the second dubbing, 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 winding, the long recorded tape is brought into contact with (or slightly lifted from) the video signal recording area, excluding the audio signal and control signal recording area, so that only this video signal recording area is exposed. play,
The signal is reproduced by a magnetic head having a cutoff frequency fH expressed by the following equation.

2f, N≦fH・・・(1) cue fH<fv°°°゛°“(2) Here,” cue is the repetition frequency of the cue signal, and N is the winding relative to the tape running speed during recording. fv, which is twice the tape running speed at the time of recording, is the lowest wave number of the video signal (not including the audio signal). Therefore, this magnetic head only reproduces the cue signal, and when several pulses of this cue signal are reproduced in succession, for example, a certain point on the recorded edge tape is the position that the magnetic head passes after being reproduced. A cutter provided at the edge is operated to cut the edge tape. A broken line I in FIG. 4 indicates this tape cutting position, and the distance a from the broken line to one end of the portion 11 where the cue signal is recorded is less than several α. As shown in FIG. 5, a leader tape 12 is adhered to the left side of this tape cut part and assembled into a cassette case (not shown). ), the reproducible portion is to the right of the dashed line (■) in FIG. 5, and the cue signal recording portion 11el is not reproduced.

Note that in the above embodiment, the video signals of the playback devices 2 and 3 are continuously set as one program, but for example, the video signals of the playback device 2 and the video signals of the playback device 3 may each be different 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 device 2.
．． It may be generated using the control signal from 3.
It is not limited to the above embodiments. Further, although the tape cutting position in FIG. 4 is for the VH8 system, in other systems, this cutting position may be within the portion 11 (1) on the right side of the portion 11θ.

As described above, the magnetic tape dubbing method according to the present invention inserts a program-distinguishable inter-program detection signal between the beginning and end of each program repeatedly supplied from a playback device, thereby dubbing a long, unused program. Recording is performed continuously on a magnetic tape, and while winding the recorded magnetic tape from the rear end, a signal for detecting between programs is played back, and the magnetic tape is cut near the detection point of the signal for detecting between programs. In order to obtain a magnetic tape on which a program has been recorded, the unrecorded magnetic tape has no scratches or dust on it before the program signal recording process, so the program signal does not drop out and is of high quality. The recorded state of each cut magnetic tape is uniform, unaffected by variations in the cassette case, etc., and there is no need for a rewinding process, and the cut magnetic tape only needs to be sampled for inspection. It is suitable for device production as it allows automation throughout the entire process, and it also has features such as the casing that houses each cut magnetic tape will not be damaged and its appearance will not deteriorate. It is something.

[Brief explanation of the drawing]

Fig. 1 is a process diagram of an example of a conventional magnetic tape dubbing method, Fig. 2 is a process diagram of an embodiment of the method of the present invention, and Fig. 3 is a process diagram of an embodiment of a dubbing device used in the method of the present invention. The block system diagrams of 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... OP U % 7 s " s '... Recording device, 10... Distributor, 11... Magnetic tape, 1
2.Leader tape, process...Continuous dubbing process, J
... Rear reel inspection process, K... Winding and cutting process. Patent applicant: Victor Japan Co., Ltd.

Claims (1)

[Claims] An inter-program detection signal that can be distinguished from the program is inserted between the beginning and end of each program repeatedly supplied from a reproducing device, and the recorded program is continuously recorded on a long unrecorded magnetic tape. While winding the magnetic tape from the rear end, the inter-program detection signal is reproduced, and the magnetic tape is cut near the detection point of the inter-program detection signal to obtain a magnetic tape on which the - program is recorded. A magnetic tape dubbing method characterized by: