JPH056756B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a measuring signal recording tape suitable for use when adjusting a magnetic recording/reproducing device (hereinafter referred to as VTR) after assembly and manufacture.

BACKGROUND TECHNOLOGY AND PROBLEMS After the assembly of a VTR is completed, each part of the VTR must be adjusted. This is then actually attached to a VTR, that is, a machine to be adjusted, to put the VTR into operation, and adjustment work is performed while displaying a reproduced image on a monitor.

This adjustment work is performed at multiple locations, and therefore multiple types of adjustments are performed. That is, as shown in FIG.
When placed on top and being transferred sequentially in the direction of the arrow at predetermined time intervals, the first adjustment step is A adjustment, the second adjustment step is B adjustment, and the third adjustment step is C adjustment. Adjustments are made, but conventionally each of these adjustment steps uses its own recording tape (magnetic tape) on which signals suitable for each adjustment are recorded.
At the beginning and end of each adjustment step, the recording tape must be attached and detached, which is troublesome and time consuming.

In this case, it may be possible to automate each adjustment, but when automating the entire adjustment process in this way, it is also necessary to automate the replacement of each recording tape as described above for each adjustment. An automatic changer had to be attached, which had the drawback of making the entire lengthening mechanism larger and more complicated.

OBJECTS OF THE INVENTION The present invention is designed to avoid the above-mentioned drawbacks and to allow the recording tape to be used commonly for all adjustment steps without having to be replaced for each adjustment step.

SUMMARY OF THE INVENTION The present invention is characterized in that a plurality of measurement signals are sequentially arranged in series in the longitudinal direction of a magnetic tape body, and the series state is repeated several times to be recorded. By providing a recording tape with a cue signal recorded on each control track of the magnetic tape, each measurement signal is used in each adjustment process, and there is no need to replace the recording tape. This allows for various adjustments to be made.

Embodiment A recording tape according to the present invention will be described with reference to FIG. 2 and subsequent figures.

As shown in FIG. 2, the recording tape 3 according to the present invention has a plurality of measurement signals (three types in the example shown, indicated by 4a, 4b, and 4c) in the longitudinal direction of the magnetic tape body 5. These recordings are repeated several times in the longitudinal direction of the magnetic tape main body 5, and the first part of each measurement signal 4a, 4b, 4c includes a header. Output signals 6a, 6b, and 6c are recorded. The measurement signals 4a, 4b, and 4c in this case are recorded in the portion of the magnetic tape body 5 scanned by the rotating magnetic head or the audio track portion as signals corresponding to the respective adjustment steps A, B, and C. The recording time is also selected to be equal to or longer than the time required for each adjustment.

The cue signals 6a, 6b, and 6c are recorded on the magnetic track of the control signal that controls the running of the recording tape 3, and in FIG. Although it is shown in the head part, in reality, due to the difference in the position of the VTR's rotating magnetic head (or audio magnetic head) and the control magnetic head relative to the recording tape, their positions are shown in Figure 2. This is not the case; this expresses a temporal relationship. The same cue signals 6a, 6b, and 6c are used for the same measurement signal.

Next, to explain this cue signal, FIG. 3 shows an example of the cue signal 6a. Furthermore, arrow 7
7a is the normal tape transport direction, and arrow 7b is the tape reverse transport direction (the same is true in FIG. 2). As is clear from this, when the tape is traveling in the normal direction, a 3-bit "111" signal is first recorded as the start signal 8, and then a transport direction determination signal 9 is generated to determine the tape transport direction. is recorded as a 1-bit "0" signal, and then an index signal 10 corresponding to the measurement signal A is recorded as a 4-bit signal (represented by D ₁ to D ₄ in the figure).

Next to this index signal 10, the above-mentioned start signal 8, transfer direction discrimination signal 9, and index signal 10 are recorded symmetrically. In the figure, corresponding signals are shown with a dash. However, the transport direction discrimination signal 9' is set to "1" in this case to distinguish it from the forward direction. A normal control signal (a signal used to control the running of the tape) is recorded next to such a cue signal. Note that the cue signal may be repeated and recorded multiple times.

“0” and “1” of these signals 8, 9, and 10 are
It is formed by modulating a control signal used to control a conventional magnetic tape. That is, the fourth
As shown in Figure A, normally, by forming positive and negative pulses Pa and Ph with a duty of 50%,
Since a control signal is formed (times t ₁ to _{t 6} ), this is set as "0", and when the duty is recorded at 20% as shown at times (t ₇ - t ₁₀ ), this is set as "1". ”. Of course, the reverse is also possible. Fourth
FIG. 4B shows a signal waveform obtained by shaping the signal shown in FIG. 4A. Therefore, the signal 8 explained in FIG.
and 9 as well as the index signal 10.
D ₁ D ₂ D ₃ D ₄ is also formed in this way, for example, as "1001".

Moreover, the index signal 10 has the following information regarding the measurement signals 4a, 4b, and 4c that are repeatedly recorded.
The same index signal is used for the same signal.

To make this recording tape, cue signals 6a, 6b, 6c, 6a, 6b, . Next, the measurement signal 4b is sequentially recorded on the portion where the signal 6b was recorded, and the subsequent recordings are sequentially performed in the same manner.

FIG. 5 shows an example of a control circuit that can be applied to the present invention. To explain this, 11 is an input terminal for the signal (pulse) shown in FIG. 4A, 12
is a waveform shaping circuit, and a clock pulse Po is obtained at the output terminal 13. This clock pulse
Po is the same pulse as the pulse Pa shown in FIG. 4A. The output terminal 14 receives the above-mentioned signals 8, 9, 10.
That is, a data pulse is obtained. These clock pulses Po and data pulses are each supplied to a shift register 15, from which a start signal 8 shown in FIG. When the gate circuit 17 is opened by this gate signal, the clock pulse Po from the output terminal 13 is supplied to the counter 18 through this.
is supplied as its start signal.

The counter 18 starts counting in response to this start signal and counts the clock pulses Po. In this example, when five pulses Po are counted, the gate circuit 1 consisting of a flip-flop
9 is supplied with an output pulse Pw.

On the other hand, a data signal corresponding to the index signal 10 is set in advance by the data set circuit 20, and this and the output from the shift register 15 described above are supplied to the matching circuit 21, and when the two match, the gate signal is The signal is supplied to the gate circuit 19. When this gate circuit 19 is opened, the output pulse Pw is taken out as a control signal. 22 is an output terminal.

The circuit shown in Fig. 5 is configured independently as an adapter, and since the VTR 1 has various remote control terminals taken out to the outside, the adjustment work shown in Fig. 1 is possible. At this time, the input terminal 11 and the output terminal 22 are connected to these remote control terminals.

Next, the operation will be explained. Prior to adjustment, each recording tape 3 according to the present invention is set in the VTR 1 as in normal use, and the above-mentioned circuit is connected to the remote control and other necessary terminals. At this time, in the data set circuit 20,
D ₁ D ₂ D ₃ D ₄ shall be set. When the recording tape is fast-forwarded in this state, a signal 6a shown in FIG. 3 is detected by the CTL signal magnetic head. When the start signal 8 "111" is detected, a gate signal is obtained from the AND circuit 16, the gate circuit 17 is opened, and the pulse Po is supplied to the counter 18 as a start signal, from which the clock pulse Po is counted. .

Furthermore, as the recording tape 3 advances, index signals up to 10 are read into the shift register 15 and supplied to the matching circuit 21. Since data D ₁ D ₂ D ₃ D ₄ is supplied from the data set circuit 20, At this time, a signal is obtained from the coincidence circuit 21, and this signal is supplied to the gate circuit 19 as a gate signal. This is then opened and a control signal is obtained at the output terminal 22, which allows the machine to be regulated to
Move the VCR to playback mode or stop it. In this stopped state, the A adjustment described in FIG. 1 can be performed by further shifting to the reproducing state.

When this A adjustment is completed, the recording tape 3 is put into a fast forwarding state again, and in this state is transferred to the B adjustment process by the belt conveyor 2. At this time, the data set circuit 20 changes the data to correspond to the index signal 10 of the cue signal of the measurement signal 4b.

As a result, the recording tape is fast-forwarded until the B adjustment is made, and is stopped or switched to the playback state at a predetermined position, so that the B adjustment work can be started immediately. Next, the same applies to the C adjustment.

In the above description, it has been explained that the recording tape 3 is fast-forwarded and then enters the stop or playback state, but it is also possible to change the recording tape from the rewound state to the stop or playback state in the same way as described above. Since the cue signals 6a, 6b, and 6c are recorded symmetrically as shown in FIG. 3, the same operation as described above can be performed in any direction of the recording tape. Furthermore, since "0" and "1" are recorded as direction discrimination signals, the direction in which the recording tape is transported can be discriminated, and a normal reproduction state can then be established. Therefore, it is also possible to perform the A adjustment again after the B adjustment.

Note that when the counter 18 counts up to the final value of the cue signal 6a shown in FIG. The gate circuit 19 is closed by this.

In addition, although three adjustments of ABC were explained in the above example, it is not limited to this. Furthermore, the cueing signals 6a, 6b, and 6c are not limited to the example shown in FIG. 3, but can be modified in various ways.

Furthermore, in this example, the same index signal 10 was used corresponding to the same measurement signal, but simply
It is clear that a signal may be recorded to indicate the beginning of each measurement signal.

Effects of the Invention According to the present invention described above, it is possible to easily find the beginning of each measurement signal in each adjustment process of a VTR, that is, the recording tape can be fast-forwarded when transitioning from one adjustment to the next. Moreover, since there is no need to replace the recording tape each time an adjustment is made, it is possible to perform speedy adjustments.
In addition, although conventionally each adjustment was made as it was obtained, it has the feature of being able to be fully automated if necessary.

[Brief explanation of drawings]

Figure 1 is a perspective view explaining the VTR adjustment process.
FIG. 2 is a front view showing an example of a recording tape according to the present invention, FIG. 3 is a diagram showing a cue signal pattern,
FIG. 4 is a signal waveform diagram, and FIG. 5 is a circuit diagram showing an example of a control circuit applicable to the present invention. 1 is a VTR, 8 is a start signal, and 10 is an index signal.

Claims (1)

[Scope of Claims] 1. A plurality of measurement signals recorded in series in the longitudinal direction of the magnetic tape body, and the serial state is repeated several times, and a signal corresponding to the beginning of the measurement signals; On the control track of the magnetic tape, a coded start signal indicating the start of the measurement signal, a coded transfer direction discrimination signal for determining the tape transfer direction, and an index indicating the content of the measurement signal. The signal is arranged symmetrically, and the cue signal is recorded by modulating the duty of the control signal in accordance with the above code, so that automatic cueing can be performed in either the forward or reverse direction of the tape. A signal recording tape for measurement of a magnetic recording/reproducing device, characterized in that: