JPH0448401A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To automatically inspect the record of audio signals and video signal by providing a means for detecting the presence/absence of video signals in a recorded tape and detecting the presence/absence of audio signals, and a means for selecting time for executing the check. CONSTITUTION:When a PLAY SW3 is turned on during reproducing, a VTR control circuit 2 outputs a QC check start signal 22. A QC check control circuit 10 receives this signal and is turned to a QC check mode. The QC check control circuit 10 starts the QC check of time set by a QC check time setting sW 11 after receiving a video recording detection signal 17, normal sound recording detection signal 18, signal 19 for detecting balance between normal sound channels, and HiFi sound recording detection signal 20. When only one of these four signals is NG, the QC check control circuit 10 judges the tape as defective and outputs a QC decision signal 21. Thus, the record of video signals and audio signals can be automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording/reproducing apparatus, and particularly to an apparatus for automatically performing a recording inspection of a recorded tape.

BACKGROUND OF THE INVENTION In recent years, the popularity of commercially available VTRs has increased, and along with this, rental videos have also become available, leading to a demand for lower priced tapes.

Conventionally, recorded recordings of dubbed tapes were inspected by humans actually playing back the tapes and inspecting the images and sounds.

Problems to be Solved by the Invention However, as described above, when a human performs the recording inspection of the tape, there is a problem that the tape's cost (up) due to human rights expenses and recording inspection are omitted.

SUMMARY OF THE INVENTION In view of this, it is an object of the present invention to provide a magnetic recording and reproducing apparatus that can automatically perform recording inspection of audio signals and video signals.

Means for Solving Ll,u The present invention is a magnetic recording and reproducing apparatus equipped with means for detecting the presence or absence of a video signal and an audio signal on a recorded tape, and means for selecting a time for testing.

Operation The present invention makes it possible to stop the operation of the VTR and inspect the recording tape when no audio signal or video signal is recorded.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. 1
is a diving VTR, and its interior will be explained below.

Reference numeral 2 denotes a VTR control circuit, which controls the entire VTR including the VTR safety protection operation control in the event of an abnormality. 3 is a PLAY SW, and when this SW is turned on, a PLAY operation signal 12 is output to the VTR control circuit 2, and the VTR starts playing. If this SW is ON during playback, the VTR control circuit 2 receives the PLAY operation signal 12 and outputs the QC check start signal 22. A video signal detection circuit 6 detects the presence or absence of the video signal 14 and outputs a video recording detection signal 17. A normal audio signal detection circuit 7 detects the presence or absence of a normal audio signal 16 and outputs a normal audio recording detection signal 18. Reference numeral 8 denotes a normal audio channel balance detection circuit which detects the level difference between CH1 and CH2 of the normal audio signal, and outputs a normal audio channel balance detection signal 19.

Reference numeral 9 denotes a Hi Fi audio signal detection circuit which detects the presence or absence of a Hi Fi audio signal and outputs a Hi Fi audio recording detection signal 20 . Reference numeral 1o denotes a QC check control circuit which controls the operation of tape recording inspection. 11 is Q
QC check time setting SW is set by this SW.
The time to perform the check can be set, and a QC check time signal 23 is output.

The operation of this embodiment configured as above will be described below. When recording on the tape is completed and an OC check is to be performed, a PLAY operation signal 12 is output to the VTR control circuit 2 by the PLAY SW3. The VTR control circuit 2 outputs a reproduction signal 13. Video circuit 4 and audio circuit 5
receives this signal and enters the playback state, the video circuit 4 receives the video signal 14, and the audio circuit 5 receives the normal audio signal 1.
5 and a HiFi audio signal 16. Playing KP
L A Y S W 3 ON I/Cf Ruto V
The TR control circuit 2 outputs a QC check start signal 22.

The QC check control circuit 10 receives this signal and enters the QC check mode. QCC check control circuit 10 video recording detection signal 17, normal audio recording detection (Nt18, normal audio channel balance detection signal 19 and Hi
In response to the Fi voice recording detection signal 20, QC check is started for the time set in QC check time setting 5W11. If even one of the four signals is NG, the QC check control circuit 10 determines that the tape is a defective tape and outputs a QC determination signal 21. The VTR control circuit 2 receives the QC determination signal 21, and in the case of NG, stops the operation of the VTR.

As described above, according to this embodiment, recording inspection of video signals and audio signals can be automatically performed.

Effects of the Invention As is clear from the above explanation, according to the present invention, when an audio signal and a video signal are not recorded, the VTR
The operation of the machine can be stopped and the recording tape can be inspected.
For example, it has become possible to automatically inspect recordings on dubbing tapes, and the effects are very significant.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a dubbing VTR according to an embodiment of the present invention, and FIG. 2 is a timing chart at the time of QC check. 1...VTR for dubbing, 2...VT
R control circuit, 3...PLAY SW, 4...
...video circuit, 6...audio circuit,
6...Video signal detection circuit, Complete...Normal audio signal detection circuit, 8...Normal audio channel balance inspection circuit, 9...HiFi
Audio signal check time horizontal ratio 10...QC check control circuit, 11...QC check time setting SW, 1
2...PLAY operation signal, 13...Playback signal, 14...Video signal, 15...
・Normal audio signal, 16... HiFt audio signal, 17... Video recording detection signal, 18...
...Normal audio recording detection signal, 19...Normal audio channel inter-channel parannu detection signal, 20...
...Hi Fi audio recording detection signal, 21...
-QC judgment signal, 22...QC check start signal, 23...QC check time signal.

Claims (1)

[Claims] means for detecting the presence or absence of a video signal on a recorded tape; means for detecting the presence or absence of a normal audio signal; means for detecting the presence or absence of a HiFi audio signal; means for detecting the balance between channels of the normal audio signal; A magnetic recording/reproducing device characterized by comprising means for selecting a time for performing an inspection.