JP2819704B2 - Magnetic recording / reproducing device for dubbing - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus (hereinafter abbreviated as VTR), and more particularly to a magnetic recording / reproducing apparatus for dubbing.

2. Description of the Related Art In recent years, VTRs have been used in various fields from home use to industrial use. Among these industrial VTRs, there is a dubbing VTR for making soft tape as a special use. This special VTR not only monitors the operation status of the VTR and displays the presence of abnormalities on the spot, but also
For automation, even if the power is turned off, the next time the power is turned on, the previously displayed error display (for example, tape cut, motor stop, interruption of input signal, etc.) will be continued again. There is a growing demand to do so. However, in the conventional VTR, when the power is turned on, not only the control circuit but also the display is initialized so that the display is in a clear state.

Problems to be Solved by the Invention However, in the conventional VTR initialized as described above, the state immediately before the power is turned off cannot be displayed. For example, when an abnormality occurs in the operation, it is recorded. Had the problem that it was not possible to check and exclude tapes.

The present invention improves on such a point and provides a VTR that continues to display immediately before the power is turned off when the power is turned on next time even if the power is turned off.

Means for Solving the Problems The present invention relates to a magnetic recording / reproducing apparatus, comprising: a monitoring circuit for monitoring the presence or absence of an abnormality during a dubbing operation; a display unit for displaying the presence of an abnormality based on a signal of the monitoring circuit; A detection circuit, a memory for storing a signal of the monitoring circuit based on a signal of the power failure detection circuit, and a power supply for backing up the memory during a power failure. Thus, if there is an abnormality before the power failure, a signal indicating that there is an abnormality on the display unit is output.

Operation According to the present invention, when the power is turned off and the power is turned on next time, the display returns to the display immediately before the power is turned off again.

Embodiment FIG. 1 is a block diagram showing an embodiment of a control device for a magnetic recording / reproducing apparatus according to the present invention. The configuration and operation of the device of the present invention will be described below with reference to the drawings.

The microcomputer 2 takes in data input from the operation switch 1 and controls the VTR mechanism 3.

In the operation storage circuit 4 which is the center of the present invention, the operation of the microcomputer 2 is constantly monitored by the monitoring circuit. I do. The monitoring circuit 12 also has a function of turning on the abnormality display lamp of the display unit 3 based on the stored data 9. The power failure detection circuit 5 detects that the power has been turned off, and outputs a latch signal 10 to the memory circuit 6. The VTR abnormality signal 8 is applied to the D terminal of the memory circuit 6 composed of D flip-flops, and can be stored at the rising timing of the latch signal 10. That is, the state immediately before the power is turned off is stored. The backup power supply 7 is a power supply for constantly operating the memory circuit 6 even during a power failure. This power source is not necessarily a battery but may be a large-capacity capacitor. Next, when the power is turned on, the microcomputer 2 executes the VTR mechanism 3 by the initial processing.
To TOP. Since the monitoring circuit monitors the stored data 9 instead of the state of the microcomputer 2, the storage contents of the memory circuit 6 are checked. If the stored data indicates an abnormality, the display is performed. The abnormality indicator lamp of the unit 3 is turned on. The reset switch 11 is for the operator to confirm the abnormal display and to erase the display.

By doing this, in a dubbing system that automatically moves multiple VTRs side by side, for example, unattended dubbing is performed at midnight and the power is turned off by the timed timer. Is normal, but it can be checked whether it was abnormal.

As described above, the present invention can be applied to an audio tape recorder, a digital audio tape recorder, and the like for the same purpose. In the above example, when the power is turned on, the microcomputer is set to the STOP state by the initial processing, but this may be returned to the state before the power was turned off by the backup power supply. .

As is clear from the above description of the embodiment, according to the present invention, when the power is restored, the abnormality display before the power failure or the power is turned off is stored, so that the dubbing during the automatic operation is prevented. The practical effect is extremely large, for example, it can be confirmed whether or not the recording has been correctly performed, and, for example, defective products of the dubbed recording tape can be easily selected.

[Brief description of the drawings]

FIG. 1 is a block diagram of a VTR control device according to one embodiment of the present invention. 2 microcomputer, 3 display unit, 4 operation storage circuit, 5 power failure detection circuit, 6 memory circuit,
7: Backup power supply, 8: VTR abnormal signal, 9:
Stored data, 10 Latch signal, 12 Monitoring circuit.

Claims (1)

(57) [Claims] 1. A monitoring circuit for monitoring the presence or absence of an abnormality during dubbing operation, a display unit for displaying the presence of an abnormality by a signal of the monitoring circuit, a power failure detection circuit, and a signal from the power failure detection circuit. A memory for storing a signal of the monitoring circuit, and a power supply for backing up the memory during a power failure, wherein the monitoring circuit reads the contents of the memory after the recovery from the power failure, so that if there is an abnormality before the power failure, A magnetic recording / reproducing apparatus for dubbing, which outputs a signal indicating that the display section has an abnormality.