JPS6037976B2 - Magnetic recording method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a so-called control track or control signal section on a tape, records a special control signal on the track or section, and uses the signal to locate the beginning of a recorded portion of the tape or record the tape. The present invention relates to a magnetic recording system in which a tape is created by duplicating a master tape so that the equalizer adjustment and bias adjustment of a reproduction device can be performed.

Normally, in a tape recorder, a so-called magnetic head is used as a magnetic transducer, in which the tape sliding surface has a magnetic gap, a magnetic path is formed by a magnetic material, that is, a core, and a wire is attached to the core. has been done.

However, in principle, when playing back, a magnetic head extracts the signal recorded on a tape as an electrical signal by differentiating it with respect to time. In this case, the output of the magnetic head has a differential waveform as shown in FIG. Applying this to the case of tape duplication, normally when creating a duplicate tape, the contents recorded on the master tape are played back at once by a playback head (signals recorded back and forth are also played back in the opposite direction). This worldly power is usually channeled into multiple recorders, creating many duplicate tapes at once. However, if the control signal shown as a in Figure 1 is recorded on the master tape, the playback output as shown in b in Figure 1 can be obtained by leading it to a copying recorder and recording it, as explained above. When the tape is further played back, the waveform shown in figure c is obtained by further differentiating the waveform shown in figure b, so this is amplified.
By removing one polarity of the signal using a diode or the like and shaping the waveform, a signal as shown in the figure e is generated. This is a signal that differs in the number of pulses from the signal d in FIG. 1, which is obtained by amplifying the signal b in FIG. 1 and performing waveform shaping. In other words, by copying from the master tape, the information of the control signal changes completely, and when controlling, for example, counting the number of pulses, the desired control cannot be performed, making it impractical. Ta. To solve this problem, '1) Do not record the control signal on the master tape, but immediately record the control signal on each duplicate tape.

'2} A pulse generating circuit such as a one-shot multivibrator is driven by the signal b in FIG. 1, and the output of the pulse generator is guided to a recording amplifier.

The following methods are possible, but method [1] lacks mass productivity and is not economical.

In addition, the method [2] is unreliable because it causes malfunctions due to crosstalk signals from adjacent tracks and noise due to instability of tape running. In view of these points, the present invention has been designed to facilitate mass production without using devices such as pulse generating circuits that are likely to malfunction.

That is, by focusing on the points that are differentiated when duplicating a tape, the signal is integrated in advance, and by recording this, integration and differentiation are performed, resulting in the original waveform being obtained. Below is the second example of the recording method.
This will be explained using figures.

First, the signal shown in FIG. 2a is passed through an integrator to obtain the signal shown in FIG. 2b. Record this on master tape. When duplicating a tape, the signal shown in figure b recorded on the master tape becomes the waveform shown in figure c when it is played back, which is then amplified and guided to a duplication recorder for recording. Signal waves as shown in Figure c will be recorded on the resulting duplicate tape. That is, the initial target signal is recorded. When this is reproduced, the waveform becomes as shown in the figure d, and by amplifying this, performing polarity selection, etc., and performing waveform shaping, a signal as shown in the figure e is obtained. This signal has exactly the same amount of information as the original waveform in terms of the number of pulses. Incidentally, a recording system according to the method of the present invention is shown in FIG.

In FIG. 3, the recording system for main signals such as audio is omitted, and only the control signals are shown. That is, 1
is a control signal generator, the output of which is integrated by an integrator 2 and input to a recorder 3 for creating a master tape.

With this recorder 3, a master tape 5 on which the signals shown in FIG. 2 are recorded by the head 4 is created. Next, the master tape 5 is played back by the head 7 of the playback device 6, and the signal has the waveform shown in FIG. be done.

Therefore, the signal recorded on this duplicate tape 10' becomes as shown in d of FIG. Of course, the same applies even if a plurality of duplicate tapes are created at one time.

As described above, when creating a master tape, the present invention integrates the control signal with an integrator and records it, thereby making it possible to create a duplicate tape from the master tape without performing any special signal conversion. It is possible to obtain a signal with the same amount of information from the tape as the master tape, and this not only prevents malfunctions when controlling with control signals, but also facilitates mass production and is highly industrializable. is a great thing.

[Brief explanation of the drawing]

A to e in FIG. 1 are signal waveform diagrams of the relevant parts in the general recording method that is the basis of the present invention, a to e in FIG. 2 are signal waveform diagrams of the relevant parts in an example of the present invention, and FIG. It is a record system diagram of the same group. 1...Control signal generator, 2...Integrator, 3...
・Master recorder, 5...master tape. Figure 3 Figure 1 Figure 2

Claims (1)

[Claims] 1. A control signal generator that generates a control signal recorded on a tape to control the running of the tape or a device for recording and reproducing the tape; an integrator that integrates the output of the control signal generator; It consists of a recorder for creating a master tape that records the output of the integrator on a master tape, and a recorder for duplication that reproduces the control signal recorded on the master tape and records it on a duplicate tape, and the control signal generation device The control signal from the device is integrated by the integrator and recorded on the master tape by a recorder for making a master tape, and the control signal recorded on the master tape is reproduced by a recorder for duplication to create a duplicate tape. A magnetic recording method characterized by recording.