JP2000036142A - Vtr having abnormal display function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To specify an abnormal portion in a short time by surveying abnormal history and discriminating whether an abnormality is generated during the transient state of a VTR condition change or not while repairing a fault of the VTR. SOLUTION: When an abnormality occurs in a cylinder motor during a transient state from the reproducing in a normal rotational direction to the reproducing while rewinding, a microcomputer 16 detects the abnormality based on the signals of a cylinder motor abnormality detecting circuit 6, controls a capstan motor system controlling circuit 8, a cylinder motor system controlling circuit 5 and a loading motor controlling circuit 15 and stops running the tape. Simultaneously, the code indicating that the portion, where an abnormality occurs, is the cylinder motor system and the code indicating that the state of the VTR is in its transient state from the normal reproducing to the reproducing while rewinding are stored in a memory 17. Thus, the memory 17 has time series plural abnormal contents stored in various operational modes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a VTR having a function of detecting and displaying an abnormality when an abnormality occurs in a signal processing circuit or a tape head mechanism.

[0002]

2. Description of the Related Art In order to repair a VTR, it is necessary to specify an abnormal part. The VTR with a failure detection function has a function to assist in specifying an abnormal part for performing a failure repair. The abnormality display function built into the conventional VTR is a storage and display of a single abnormality occurrence location and status. Even when a different abnormality frequently occurs in the same VTR, one of the abnormality occurrence locations and conditions is displayed. It was only a memory display of the situation. In addition, even when an abnormality occurs in the VTR state and the transient state of the tape traveling mechanism, the state of the VTR immediately before the abnormality occurs is stored and displayed. Japanese Unexamined Patent Application Publication No. 8-194 discloses this type of abnormality detection and display.
No. 985, “VTR with a failure detection function” and the like.

[0003]

In the storage and display of the location and status of an abnormality for one time, it is not possible to investigate the history of the abnormality, and there is no particular problem when the same abnormality repeatedly occurs. In the case where a different abnormality occurs in the VTR, it is difficult to identify the cause of the abnormality. Also VT
When an abnormality occurs in the state of R and the transient state of the tape running mechanism, the state of the VTR immediately before or immediately after the abnormality is stored and displayed, so it is difficult to identify the cause of the abnormality peculiar to the transient state. Met.

[0004]

In order to solve the above-mentioned problems, the present invention provides an abnormality detecting means for detecting an abnormal operation of a signal processing circuit or a tape head driving mechanism, and an operation mode of a VTR when the abnormal state is detected. Abnormality storage means for storing the contents of the abnormality in chronological order, and abnormality display means for displaying the details of the abnormality stored in the abnormality storage means. The abnormality storage means and the abnormality display means store a plurality of abnormality contents. It is characterized by storing and displaying. Further, when the abnormality detecting means detects an abnormality in a transition period when the operation mode of the VTR is switched, the abnormality storage means and the abnormality display means,
It is characterized by storing and displaying that the operation mode is in a transient state.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a VTR with an abnormality display function according to one embodiment of the present invention. First, the operation of each unit in FIG. 1 will be described.

Reference numeral 1 denotes an audio signal processing circuit that performs audio processing of a VTR. An abnormality in the audio signal processing circuit 1 is detected by the audio abnormality detection circuit 2 and sent to the microcomputer 16. Reference numeral 3 denotes a video signal processing circuit. The video signal a processed by the video signal processing circuit 3 is input to a cylinder motor system control circuit 5 and a capstan motor system control circuit 8. An abnormality of the video signal processing circuit 3 is detected by the video abnormality detection circuit 4 and sent to the microcomputer 16. Reference numeral 5 denotes a cylinder motor control circuit which controls the cylinder motor 7 by a cylinder motor control signal b so as to synchronize with the input video signal a. 6
Is a cylinder motor abnormality detection circuit which detects abnormality of the cylinder motor system control circuit 5 and the cylinder motor 7. When the cylinder motor abnormality detection circuit 6 detects the abnormality, it notifies the microcomputer 16 that the abnormality has occurred. 8 is a capstan motor system control circuit,
This circuit controls the capstan motor 10 by the capstan motor control signal c so as to synchronize with the input video signal a. Reference numeral 9 denotes a capstan motor abnormality detection circuit which detects an abnormality of the capstan motor system control circuit 8 and the capstan motor 10. When the capstan motor abnormality detection circuit 9 detects the abnormality, it notifies the microcomputer 16 that the abnormality has occurred. Reference numeral 11 denotes a reel rotation detecting circuit which sends a pulse signal d proportional to the rotation of the tape take-up reel to the microcomputer 16. If the microcomputer 16 does not detect the pulse signal d for a predetermined time or more during the running of the tape, the microcomputer 16 determines that the rotation of the reel is abnormal. A loading motor control circuit 15 controls the loading motor 13 by a loading motor control signal e in order to move the tape traveling mechanism 12 to an appropriate position with respect to the tape traveling direction and speed. Reference numeral 14 denotes a position detection circuit of the tape running mechanism 12, which is mechanically connected to the tape running mechanism 12, converts the position of the tape running mechanism 12 into electrical information, and sends the information to the microcomputer 16.

[0007] For example, a case where an abnormality occurs in the rotation of the reel during the tape rewinding will be described. If the microcomputer 16 cannot detect the pulse signal d from the reel rotation detection circuit 11 for a predetermined time or more,
It is determined that there is an abnormality in the rotation of the reel. When the microcomputer 16 detects an abnormality, the microcomputer 16 controls the cylinder motor system control circuit 5, the capstan motor system control circuit 8, and the loading motor control circuit 15 to stop the tape running. At the same time, a code indicating that there is an abnormality in the rotation of the reel and a code indicating that the occurrence state is that the tape is being rewound are stored in the memory 17. This memory 17
Is constituted by a nonvolatile memory.

Next, a description will be given of a case where an abnormality occurs in the cylinder motor system control circuit 5 in a transition state where the tape running is changed from normal reproduction in the normal rotation direction to rewind reproduction in the reverse rotation direction. When the tape running is changed from normal reproduction in the normal rotation direction to rewind reproduction, the microcomputer 16
Sends a stop control signal to the capstan motor control circuit 8. In response to this, the capstan motor control circuit 8 controls the capstan motor 10 to stop. At the same time, the microcomputer 16 controls the loading motor control circuit 15 to drive the loading motor 13 to move the position of the tape running mechanism 12 from the reproduction position to the stop position. During this time, the microcomputer 16
Observes the position of the tape running mechanism 12 based on information from the position detection circuit 14, and when it detects that the tape traveling mechanism 12 has moved to the stop position, sends a stop signal to the loading motor control circuit 15 to stop the loading motor 13. Thereafter, the microcomputer 16 sends a control signal for reverse rotation to the capstan motor control circuit 8 to cause the capstan motor 10 to rotate reversely. At the same time, the microcomputer 16
Controls the loading motor control circuit 15 to drive the loading motor 13 to move the position of the tape running mechanism 12 from the stop position to the reverse playback position. During this time, the microcomputer 16 observes the position of the tape running mechanism 12 based on the information from the position detection circuit 14, and sends a stop signal to the loading motor control circuit 15 when it detects that the tape traveling mechanism 12 has moved to the reverse playback position. To stop.

As described above, when an abnormality occurs in the cylinder motor in the transition state in which the tape running changes from normal reproduction in the normal rotation direction to rewind reproduction, the microcomputer 16 responds to the signal from the cylinder motor abnormality circuit 6 Upon detecting the abnormality, the capstan motor system control circuit 8
The cylinder motor system control circuit 5 and the loading motor control circuit 15 are controlled to stop the tape running. At the same time, a code indicating that the location where the abnormality has occurred is a cylinder motor system and a code indicating that the state of the VTR at this time is a transitional state of changing from normal reproduction to rewind reproduction are stored in the memory 17.

As described above, the memory 17 stores a plurality of abnormal contents in a time series in various operation modes including the transient state.

Next, a description will be given of a procedure for displaying the content of the error and the status of the occurrence of the error after the occurrence of the error. When the switch 19 is pressed while the VTR is turned off, the microcomputer 16 detects this and reads out a code indicating the content of the abnormality that has occurred first and a code indicating the state of the VTR at the time of the abnormality from the memory 17 and displays the code. The device 18 is controlled to display the first abnormality that has occurred. When the switch 20 is pressed while the VTR is turned off, the microcomputer 16
Detects this, reads out the code indicating the content of the second occurrence of the abnormality from the memory 17 and the code indicating the state of the VTR at the time of occurrence of the abnormality, and controls the display device 18 to display the second occurrence of the abnormality.

In this embodiment, a method of displaying an error by operating a switch when the VTR is turned off is described. However, the method of displaying an error is not limited to this.
Other methods such as remote control operation may be used. In addition, a method of operating separate switches to display the first abnormality and the second abnormality is described. However, the display method is not limited to this, and the display method is not limited to this. Other methods, such as a method of sequentially displaying the first abnormality, the second abnormality, and the third abnormality, may be used. The method of storing and displaying the contents of the abnormality and the state of the VTR at the time of occurrence of the abnormality is described. However, the contents to be stored and displayed may be the date and time at the time of occurrence of the abnormality in addition to the above.

[0013]

According to the present invention, when repairing a failure of a VTR, it is possible to investigate the history of the abnormality and determine whether or not the abnormality has occurred in the transient state of the VTR state change. The location can be specified in a shorter time than before.

[Brief description of the drawings]

FIG. 1 is a block diagram of a VTR with an abnormality display function according to an embodiment of the present invention.

[Explanation of symbols]

 1. 1. Audio signal processing circuit Audio abnormality detection circuit 3. Video signal processing circuit 4. Image abnormality detection circuit 5. 5. Cylinder motor system control circuit 6. Cylinder motor abnormality detection circuit 7. Cylinder motor 8. Capstan motor system control circuit Capstan motor abnormality detection circuit 10. Capstan motor 11. Reel rotation detection circuit 12. Tape running mechanism 13. Loading motor 14. Position detection circuit 15. Loading motor control circuit 16. Microcomputer 17. Memory 18. Display device 19.20. switch

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Mitsuru Hirota 1410 Inada, Hitachinaka-shi, Ibaraki Pref., Hitachi, Ltd. F term (reference) 5D101 AC01 AD17 LA30 LA46

Claims (3)

[Claims] An abnormality detecting means for detecting an operation abnormality of a signal processing circuit or a tape head drive mechanism in a VTR, and an abnormality storage means for storing an operation mode of the VTR when the abnormality is detected and a content of the abnormality. Abnormality display means for displaying the contents of the abnormality stored in the abnormality storage means, wherein the abnormality storage means and the abnormality display means store and display a plurality of abnormality contents in chronological order. VTR with display function. 2. The apparatus according to claim 1, wherein when the abnormality detecting means detects an abnormality in a transition state in which the operation mode of the VTR is switched, the abnormality storage means and the abnormality display means have an operation mode in a transition state. A VTR with an abnormal display function characterized by storing and displaying a VTR. 3. A VTR with an abnormality display function according to claim 1, wherein said abnormality storage means and said abnormality display means store and display a date and time when an abnormality is detected.