JPH0512752A - Inspection device for magnetic tape reproduction device and magnetic tape for inspection - Google Patents

Abstract

PURPOSE:To reduce the cost of inspection by simplifying the inspecting process and inspection device for the magnetic tape reproduction device. CONSTITUTION:A signal which varies in frequency in the length direction of the magnetic tape 31 of a cassette 3 for inspection is recorded on the magnetic tape 31, which is forwarded fast or rewound at a place of a predetermined frequency for a predetermined time to judge whether or not the reproduction device 2 is normal or not from whether a signal of frequency corresponding to the fast-forwarding or rewinding quantity is reproduced or not. Consequently, large-scale facilities for fitting an encoder to a reel motor M1 need not be used, easy high-precision inspection is realized, and the inspection cost is reducible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus for reproducing a magnetic tape such as a compact cassette and a magnetic tape for inspection.

[0002]

2. Description of the Related Art A reproducing device for reproducing a magnetic tape such as a so-called compact cassette is inspected whether its operation is normal or not in a completion inspection and an adjustment process. In a typical conventional technique, an operator operates various operation buttons, and in response to the operation, whether a reel, a capstan, or the like is rotating in a correct direction at a correct speed,
It is inspected visually by the operator.

In another conventional technique, the reel, the capstan, etc. are photographed by a television camera, and the photographed image is processed by a computer or the like to detect the rotation direction and the rotation speed, and then the normality is detected. It is detected whether or not it is operating.

Further, in another conventional technique, an encoder or the like is attached to a rotating portion such as a reel or a motor, and the rotation direction and the rotation speed are detected from an output signal thereof to inspect whether or not the operation is normal. is doing.

[0005]

In the above-mentioned visual inspection method, an inspection error is likely to occur, and the rotation speed and the like cannot be inspected with high accuracy.

Further, in the inspection method using the television camera, the structure for image processing is large and the cost is high.

Further, in the inspection method using the encoder or the like, the inspection process is complicated due to the attachment of the encoder and the inspection equipment is also complicated.

An object of the present invention is to provide an inspection device and an inspection magnetic tape for a magnetic tape reproducing device, which can simplify the inspection process and inspection equipment and reduce the inspection cost.

[0009]

DISCLOSURE OF THE INVENTION The present invention provides an inspection magnetic tape on which a signal whose frequency changes in the longitudinal direction is recorded, and a plurality of types of operations relating to reproduction of the inspection magnetic tape in a reproducing device. Drive means to be performed, control means to give the drive means a control signal corresponding to each operation of the reproducing means, and whether the frequency of the reproduction signal from the reproducing device is a frequency corresponding to the control signal. An inspection device for a magnetic tape reproducing apparatus, comprising: a determination unit for determining and a display unit for displaying a determination result of the determination unit.

Further, the present invention is a magnetic tape for inspection used for inspection of a magnetic tape reproducing apparatus, wherein a signal whose frequency changes in the longitudinal direction is recorded. It is a magnetic tape for inspection.

[0011]

According to the present invention, a signal whose frequency changes in the longitudinal direction, for example, stepwise and cyclically, is recorded on the magnetic tape for inspection loaded during the inspection of the reproducing apparatus. In the magnetic tape reproducing device loaded with the magnetic tape for inspection, its operation button is operated by a driving means such as an air cylinder to reproduce, fast-forward, rewind,
And a plurality of types of operations related to playback such as repeated playback.

The driving means causes the reproducing means to perform each of the operations in response to a control signal from a control means such as a microcomputer. The control signal is also given to the determination means, and the determination means determines whether or not the frequency of the reproduction signal from the reproduction device is the frequency corresponding to the control signal. The result of the determination is notified to the inspection operator by means of, for example, a video or audio display means.

That is, for example, when the control signal is a signal for performing normal rotation reproduction of the magnetic tape, whether the frequency of the reproduction signal changes in the increasing direction or in the decreasing direction, and further, the change. Depending on the speed, it is possible to inspect the rotation direction and the rotation speed. Even in the fast-forwarding or rewinding operation, it is possible to inspect whether or not each of the above-described operations is normally performed based on the increasing / decreasing direction and the increasing / decreasing amount of the reproduction signal as described above.

[0014]

1 is a block diagram showing the electrical construction of an inspection apparatus 1 according to an embodiment of the present invention. This inspection device 1
In general, the inspection cassette 3 loaded in the reproduction device 2 to be inspected, the frequency counter 4, the processing device 5 which is realized by a microcomputer or the like and is a control unit and a determination unit, and a drive unit 6 are provided. It is configured to include.

To the frequency counter 4, the reproduction signal of the inspection cassette 3 is input from the output terminal 11 of the reproduction device 2 through the line 12. The reproduction signal is also given to the power amplifier 14 via the line 13, amplified by the power amplifier 14 and sonicated from the speaker 15. As a result, the inspection can be performed not only by the inspection by the inspection apparatus 1 described later but also by listening to the reproduced sound of the inspection operator.

The frequency counter 4 measures the frequency of the reproduction signal from the reproduction device 2 and inputs the measurement result to the processing device 5. As will be described later, the processing device 5 determines whether the reproduction device 2 is based on whether the frequency of the reproduction signal of the reproduction device 2 and the control signal output to the drive device 6 via the line 16 match. It is detected whether or not it is operating normally, and the detection result is displayed on the display device 7.

On the other hand, the playback device 2 includes various push buttons B1, B2, ..., Bn (hereinafter referred to when collectively referred to) relating to playback operations such as playback, fast-forward, rewind, repeat playback, and cue selection. (Indicated by the letter B) is provided. Corresponding to this, the drive device 6 includes air cylinders C1, C2, ..., Cn (hereinafter referred to as a reference numeral C when collectively referred to) arranged to face each push button B, and each air cylinder C. .., Vn (hereinafter referred to as a reference symbol V when collectively referred to), and an air cylinder C via the solenoid valve V.
It comprises a compressed air source 18 for supplying compressed air to and a drive circuit 17 for selectively connecting / disconnecting each solenoid valve V in response to a control signal from the processing device 5.

The reproducing apparatus 2 includes a pair of reels R1 and R2 for driving the magnetic tape cassette to run, a reel motor M1 for driving the reels R1 and R2, and a cap for running the magnetic tape 31 at a constant speed. Stan R
3, R4, a capstan motor M3 for rotating the capstans R3, R4 at a constant speed, and pinch rollers R5, R6 paired with the capstans R3, R4.
And a magnetic head 21, and a head drive unit 22 for rotatively displacing the magnetic head 21 by 180 ° so that the magnetic head 21 can be displaced toward and away from a magnetic tape, and can be reproduced in both forward and reverse rotation directions. It is composed of.

In the reproducing apparatus 2, when the push button B is pressed, the control circuit 23 drives the motors M1 and M3 and the head driving section 22 in a state corresponding to the operation, and a predetermined reproducing operation state is obtained. To be realized. A reproduction signal from the magnetic head 21 is amplified by the head amplifier 24 and then led to the output terminal 11.

The reproducing device 2 reproduces the magnetic tape 31 when the push button B1 is operated, performs fast forward when the push button B2 is operated, rewinds when the push button B3 is operated, and push button B4. When is operated, the playback direction is reversed,
When the push button B5 is operated, the next song is cued. Therefore, when each push button switch B is operated by the air cylinder C, the reproducing apparatus 2 performs each operation as described above.

FIG. 2 shows the magnetic tape 3 of the inspection cassette 3.
FIG. 3 is a diagram showing a recording state of No. 1. On the magnetic tape 31, for example, a signal in which the frequency gradually increases at a predetermined cycle W1 at the time of normal reproduction of the A surface indicated by the arrow 32 is recorded. For example, 1 kHz to 5 kHz.
Up to a length corresponding to the reproduction time of 1 second, that is, 4.8 cm for a compact cassette.
Each time, it is recorded so as to increase by 0.1 kHz. When the recording up to 5 kHz is completed in this way, a signalless region is formed for a period W2, for example, 10 seconds, and then a signal that gradually increases from 1 kHz is recorded again. Therefore, the length of the period W3 from the leading end portion where 1 kHz is recorded to the end portion of the unrecorded area is 51 seconds, for example. Using the inspection cassette 3 in which such an inspection signal is recorded, the reproduction apparatus 2 is inspected as follows.

That is, when the reproduction operation is inspected,
As shown in FIG. 3, in step n1, the air cylinder C1
Operates the push button B1 to enter the reproduction operation state. Step n
At 2, the frequency of the reproduction signal measured by the frequency counter 4 is monitored, and at Step n3, Step n2
The frequency monitored at is a predetermined frequency, for example 1
KHz, and a predetermined time W for reproduction at that frequency
1, it is judged whether or not it has continued for 1 second, and if so, the process proceeds to step n4.

In step n4, the frequency of the reproduction signal is monitored in the same manner as in step n2, and in step n5, the frequency is reproduced at a predetermined value, that is, 1.1 kHz for the time of 1 second, as in step n3. It is determined whether or not it has been done, and if so, the reproduction of the frequency of the next stage is performed, and when the signals of all the frequencies have been accurately reproduced over the period W3, in step n6, the reproduction operation is performed. Is displayed and the operation ends. If the signal of the predetermined frequency has not been reproduced for the predetermined time in the judgment steps such as the steps n3 and n5, it is displayed in step n7 that there is an abnormality and the operation is terminated.

When the inspection cassette 3 is inspected in the reverse direction, the push button B4 for reversing the traveling direction is operated in addition to the operation of the push button B1 in step n1, and the above-described steps are sequentially performed from a high frequency. The inspection is performed in the same manner as the operation shown in FIG.

The fast-forward operation is also inspected as shown in FIG. That is, in step n11, the push button B1
Is operated to enter the reproduction state, and in step n2, it is determined whether or not a predetermined frequency, for example, 1 kHz is detected. If not, step n12 is repeated, and reproduction is performed until the predetermined frequency is detected. , Step n13. At step n13, the push button B2 is operated to set the fast-forward state, and at step n14
Then, it is determined whether or not a predetermined time, that is, 5 seconds, has elapsed since the fast-forwarding state, and if not, step n14 is repeated, and when the time elapses, the process proceeds to step n15. .

At step n15, the push button B1 is operated again to bring it into a reproduction state, and at step n16, it is determined whether or not the frequency of the signal being reproduced is a frequency corresponding to the fast-forwarding amount at step n14, for example, 4 kHz. If it is, the normal state is displayed in step n17, and if it is not, the abnormal state is displayed in step n18 and the operation ends.

Similarly, regarding the rewinding operation, after rewinding for a predetermined time from the state where the signal of the predetermined frequency is being reproduced, the signal of the frequency corresponding to the rewinding time is detected. Whether or not the rewinding is normally performed can be determined depending on whether or not the rewinding is normally performed.

Furthermore, the inspection for automatic cueing operation is shown in FIG.
Can be performed as shown in. That is, in step n21, the push button switch B1 is operated to enter the reproduction state, and in step n22, the push button switch B5
Is operated to set the cueing operation state. Step n2
In step 3, the fast-forwarding state is set, and in step n24, it is determined whether or not the no-signal portion is detected. If not, step n24 is repeated, and when the no-signal portion is detected, the process proceeds to step n25. In step n25, the reproduction state is restored again, and in step n26, it is judged whether or not the reproduced signal is 1 kHz. If yes, step n27 indicates that it is in the normal state, and if not, step n At n28, the operation is terminated after the abnormal state is displayed.

Further, when inspecting the repeated reproduction operation, step n2 of the automatic cueing operation shown in FIG. 5 is performed.
This can be realized by replacing the fast-forward operation in 3 with a rewind operation. Also, in the interlaced playback of the unrecorded part,
When the non-recording portion is detected, the fast-forwarding state is set, and when the non-recording portion is not detected, the playback state is set. This can be realized by using steps n23 to n28 of the cueing operation shown in FIG. Further, the beginning music reproducing operation can be realized by repeating the steps n23 to n28.

The above-described embodiment is performed at the time of so-called completion inspection or shipping inspection, which is performed at the time when the assembly of the reproducing apparatus 2 is completed. Therefore, in order to perform the above-described inspection only when the reproducing mechanism of the magnetic tape, that is, when the so-called reproducing assembly is completed, as shown in the inspection device 51 of FIG. , SWn in parallel with the switches SW1, SW2, ..., SWn corresponding to the push button B, and the relay switches S1, S2 ,. Ln is the drive circuit 1
A similar test can be performed by being excited / demagnetized by 7.

The magnetic tape 31 of the inspection cassette 3 is also used.
In place of the signal whose frequency changes stepwise as shown in FIG. 2, the magnetic tape 3 is replaced by the magnetic tape 3 as shown in FIG.
A signal whose frequency continuously changes along the longitudinal direction of 1 may be recorded. Furthermore, the same signal may not be recorded on the A surface and the B surface of the magnetic tape 31 as shown in FIG.

Thus, in the inspection device 1 according to the present invention,
Since various operating states are inspected by using the inspection cassette 3 in which the signal changing in the longitudinal direction is recorded, an encoder is attached to the reels R1 and R2, capstans R3 and R4, or a television camera. It is possible to easily detect the rotation speed with high accuracy without using a large-scale inspection facility such as for taking an image, and it is possible to reduce the inspection cost.

[0033]

As described above, according to the present invention, a signal whose frequency changes in the longitudinal direction is recorded on the magnetic tape for inspection, and the frequency of the reproduced signal is used for each operation of the reproducing apparatus. Since it checks whether the playback device is normal or not based on whether or not the value corresponds to, it is not necessary to install a special configuration for testing the playback device such as an encoder. It is possible to carry out the inspection by a simple operation such as mounting a plug on the output terminal of, and with simple equipment, and it is possible to reduce the inspection cost. Further, the running speed of the magnetic tape can be inspected with high accuracy.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of an inspection device 1 according to an embodiment of the present invention.

FIG. 2 is a diagram showing a recording state of a magnetic tape 31 of an inspection cassette 3.

FIG. 3 is a flow chart for explaining the inspection procedure of the reproduction operation.

FIG. 4 is a flowchart for explaining an inspection procedure of a fast-forward operation.

FIG. 5 is a flowchart for explaining an inspection procedure for a cueing operation.

FIG. 6 is a block diagram showing a simplified inspection apparatus 51 according to another embodiment of the present invention.

FIG. 7 is a graph for explaining a recording state of a magnetic tape of an inspection cassette according to still another embodiment of the present invention.

[Explanation of symbols]

1,51 inspection device 2 playback device 3 inspection cassettes 4 frequency counter 5 processor 6 drive 21 heads 31 magnetic tape B push button switch C air cylinder M1 reel motor M3 capstan motor R1 and R2 reels

Claims (2)

[Claims] 1. A magnetic tape for inspection in which a signal whose frequency changes in the longitudinal direction is recorded, a drive means for causing a reproducing apparatus to perform a plurality of types of operations regarding reproduction of the magnetic tape for inspection, and a reproducing means. Control means for providing the drive means with a control signal corresponding to each of the operations, determination means for determining whether or not the frequency of the reproduction signal from the reproduction device is a frequency corresponding to the control signal, And a display unit for displaying the determination result of the unit. 2. An inspection magnetic tape used for an inspection of a magnetic tape reproducing apparatus, wherein a signal whose frequency changes in the longitudinal direction is recorded, and the inspection magnetic tape of the magnetic tape reproducing apparatus. tape.