JPS613380A - Signal recording tape for measurement of magnetic picture recording and reproducing device - Google Patents

Abstract

PURPOSE:To enable common use of a recording tape for measurement for all adjusting process by recording searching signals corresponding to the beginning of series signals for measurement in a control track of a signal recording tape for measurement. CONSTITUTION:Signals for measurement 4a-4c of each adjuting process are recorded in series in the signal recording tape 3 for measurement, and searching signals 6a-6c are recorded in a control track in the initial parts of signals 4a-4c. Accordingly, measurement and adjustment of a magnetic picture recording and reproducing device can be made by using a signal recording tape for measurement in common for all adjusting processes without changing the signal recording tape for measurement for each adjusting process.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording and reproducing device (hereinafter referred to as VT) after assembly and manufacturing.
The present invention relates to a measuring signal recording tape suitable for use in adjusting the signal R.

BACKGROUND TECHNOLOGY AND PROBLEMS Once the VTR has been assembled, it is time to start adjusting its various parts. Leave it there,
This is actually attached to a VTR, that is, a machine to be adjusted, and the VTR is brought 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. 1, when a plurality of VTRs (11) are placed on a conveyor belt (2) and are being transported one after another in the direction of the arrow at a predetermined time interval, in the first adjustment step A - In the second adjustment step, the B adjustment is performed, and in the third adjustment step, the C adjustment is performed. Conventionally, in each of these adjustment steps, a recording tape (magnetic tape) on which a signal suitable for each adjustment is recorded is used. Each recording tape is used independently, so there is the hassle of having to attach and detach this recording tape at the beginning and end of each adjustment process, and the length is time-consuming. Ta.

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 above-mentioned replacement of each recording tape for each adjustment.In other words, an autochanger for the recording tape must be attached, and the length of the entire mechanism is large. It has the disadvantage of becoming more complex and complex.

OBJECTS OF THE INVENTION The present invention avoids the above-mentioned drawbacks and is designed 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 main body, and the series state is repeated several times to record, and at the beginning of each measurement signal. By providing a recording tape on which a cue signal is recorded on the control track of the magnetic tape, each measurement signal is used in each adjustment process, and therefore each measurement signal can be adjusted without replacing the recording tape. This allows adjustments to be made.

Embodiment A recording tape according to the present invention will be explained with reference to FIG. 2 and the following.

The recording tape (3) according to the present invention, as shown in FIG.
A plurality of measurement signals (three types in the illustrated example, (4)
a) (4b) (4c)) is the magnetic tape body (5)
These recordings are repeated several times in the longitudinal direction of the magnetic tape body (5), and each measurement signal (4a) ( The cue signals (6a), (6b), and (6c) are recorded in the first portions of 4b and 4c.

In this case, the measurement signals (4a), (4b), and (4c) correspond to the respective adjustment steps A, B, and CK, such as the portion of the magnetic tape body (5) scanned by the rotating magnetic head or the audio track portion. The recording time is selected to be equal to or longer than the time required for each adjustment.

In addition, 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. 2, each measurement signal is (4a), (4b), and (4c), but in reality, this is due to the difference in the position of the VTR's rotating magnetic head (or audio magnetic head) and control magnetic head relative to the recording tape. , the position is not as shown in FIG. 2, but this represents a temporal relationship. Also, this cue signal (6a) (6b) (6c)
The same cue signal is used for the same measurement signal.

Next, to explain this cue signal, the third figure shows an example of the cue signal (6a). Note that the arrow (7a) is the normal direction of tape transport, and the arrow (7b) is the reverse direction of tape transport (the same applies to FIG. 2). As is clear from this, when the tape is moving in the normal direction, a 3-bit "111" signal is first recorded as a start signal (8), and the direction of tape transport is determined by j(N). The transport direction discrimination signal (9) is recorded as a 1-bit "0" signal, and then the index signal 0.01 corresponding to the measurement signal is recorded as a 4-pit signal (represented by Dl-D4 in the figure). recorded.

Next to this index signal (1, 01), the above-mentioned start signal (8), transfer direction determination signal (9), and index signal aυ are recorded symmetrically. In the figure, a dash is added to the corresponding signal. It shows.

However, the transport direction discrimination signal (9) is set to "1" in this case to distinguish it from the forward direction. Following such a cue signal, a normal control signal (a signal used to control the running of the tape) is recorded. The double start signal may be repeated and recorded multiple times.)

Each of these signals f8+ +91 QOI rOJ rl
J is formed by modulating a control signal used to control a conventional magnetic tape. That is, as shown in FIG. 4A, normally a control signal is formed (times t1 to +6) by forming positive and negative pulses Pa and Pb with a duty of 50%, so this is set to "0".
", and as shown at time (t7 to jto), when the duty is recorded as 20%, this is set as "1".

Of course, the reverse is also possible. FIG. 4B shows a signal waveform obtained by shaping the signal shown in FIG. 4A. Therefore, not only the signals (8) and (9) explained in FIG. 3, but also the index signal QQI DID2D3D4 are formed in this way, for example, as "1001".

Furthermore, the index signal αO is the same as the measurement signals (4a), (4b), and (4c) that are repeatedly recorded.

To create this recording tape, first send a cue signal (6a).
(6b) (6c) (68) (6b)...+ (record it, then record the measurement signal (4a) in the part where the signal (6a) was recorded, and then 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, aυ is an input terminal for the signal (pulse) shown in FIG. 4, a2 is a waveform shaping circuit, A clock pulse Po is obtained from the output terminal (131). This sunset pulse Po is the pulse P shown in Figure 4.
This is the same pulse as a. The above-mentioned signal (81(9)a1, that is, the data pulse) is obtained at the output terminal Q41. These clock pulses Po and data pulses are respectively supplied to the shift register (151, and from this, the start signal (81(9)a1, ie, the data pulse) shown in FIG. ) is taken out, this 3-bit signal is supplied to an AND circuit Q61, and its output is supplied as a gate signal to a gate circuit a consisting of a flip-flop circuit, and when the gate circuit αη is opened by this gate signal. , output terminal (clock pulse P from 131
o is supplied through this to the counter α& as its start signal.

The counter a& starts counting by the cono start signal and counts the clock pulses Po. And in this example 5
When counting pulses Po, the gate circuit a! is composed of flip-flops. An output pulse h is supplied to J.

On the other hand, the index signal a is generated by the data set circuit (4).
A data signal corresponding to α is set in advance, and this and the output of the above-mentioned shift register (151) are supplied to a matching circuit (211), and when the two match, a gate signal is supplied from this to the gate circuit (19). be done.

When this gate circuit a9 is opened, the output pulse P
w is taken out to the outside as a control signal. 122+ is an output terminal.

The circuit shown in Fig. 5 is constructed independently of the adapter, and since the VTR (1) has various remote control terminals taken out to the outside, the circuit shown in Fig. 1 is During adjustment work, connect the input terminal Qll and the output terminal (2z) to the I=1-ring terminal of these remote controllers.

Next, to explain the operation, 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. do. At this time, it is assumed that DID2D3D4 is set in the data set circuit (2). When the recording tape is fast-forwarded in this state, the CTL signal magnetic head generates the signal shown in Figure 3 (
6a) is detected.

When the start signal (8) "111" is detected, a gate signal is obtained from the AND circuit ae, the gate circuit aη is opened, and the pulse PO is supplied to the counter Q81 as a start signal. will be counted.

Furthermore, as the recording tape (3) advances, the index signal (up to 101 is read into the shift register (+51) and this is supplied to the coincidence circuit +211 IC. Since data DID2D3D4 is supplied from the data set circuit (a), At this time, a signal is obtained from the matching circuit Ca1l, and this is supplied as a gate signal to the gate circuit 09. Therefore, this opens, and a control signal is obtained at the output terminal (221), which reproduces the VTR as the adjusted device. In this stopped state, the A adjustment described in FIG. 1 can be performed by further shifting to the reproducing state.

When this manual adjustment is completed, the recording tape (3) is again put into a fast-forwarding state, and in this state is transferred to the B adjustment process by the belt conveyor (2). At this time, the data set circuit (20+) is changed to data corresponding to the index signal (101) of the cueing 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. The same goes for the next 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. This is the cue signal (6a) (6b) (6c
) is recorded symmetrically as shown in Figure 3, so the same operation as described above can be performed in any direction on the recording tape, and "O" is used as the direction discrimination signal. 11" are recorded separately, so the direction in which the recording tape is transported can be determined, and a normal playback state can then be established. Therefore, after the B adjustment, it is also possible to carry out an operation to perform the AM adjustment again.

In addition, the signal when the counter Q81 counts up to the last cue signal (6a) shown in FIG. 3, for example,
Or terminal c by external manual operation! When the signal from the leak is supplied to the gate circuit α9 through the OR circuit (c), this causes the gate circuit a! I'm trying to close I.

In addition, the three adjustments of ABC were explained above.
It is not limited to this. Start of sentence signal (6a) (
6bX6c) is not limited to the example shown in FIG. 3, and various changes can be made.

Furthermore, in this example, the same index signal (101) was used corresponding to the same measurement signal, but it is clear that a signal simply indicating the head of each measurement signal may be recorded. .

According to the present invention, which has been described in detail, 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, and there is no need to replace the recording tape each time an adjustment is made, so it has the advantage of being able to perform speedy adjustments. Furthermore, although conventionally each adjustment was done manually, it has the feature of being able to be fully automated if necessary.

[Brief explanation of the drawing]

Fig. 1 is a perspective view illustrating the adjustment process of a VTR, Fig. 2 is a front view showing an example of the lead tape according to the present invention, Fig. 3 is a diagram showing the cue signal pattern, and Fig. 4 is a signal waveform. It is a diagram. (1) is a VTR, (81 is a start signal, (Iol is an index signal. Measurement signal recording tape 3 of magnetic recording and reproducing equipment, relationship with the case of the person making the correction Special 11''Ex) 9f [Person address: Tokyo Parts Store, Kitashinyo 6-chome, Roar No. 35 Name (218) Sony Corporation Representative Director Norio Ohga6, Number of inventions to be increased due to amendment7, Subject of amendment A column for a brief explanation of the drawings in the specification (
1) In the specification, page 13, line 4 says, "This is a signal waveform diagram."
1 is a signal waveform diagram, and FIG. 5 is a circuit diagram showing an example of a control circuit that can be applied to the present invention. ” he corrected. that's all

Claims (1)

[Claims] A plurality of measurement signals are sequentially arranged in series in the longitudinal direction of the magnetic tape body, and the serial state is repeated several times and recorded, and at the beginning of each measurement signal, the control of the magnetic tape is recorded. A signal recording tape for measurement of a magnetic recording/reproducing device, in which a cue signal is recorded on each track.