JPH04247301A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To provide a means for simultaneously executing the checking of the recording quality of a recorded tape and recording at the time of executing dubbing recording of a software tape. CONSTITUTION:A video signal input and an audio signal input are respectively subjected to FM modulation with a modulation circuit 6 and are respectively recorded on the tape by a recording-only head 2 of a video and the recording- only head 3 of audio FM. These inputs are reproduced by a reproduction-only head 4 of the video which reproduces the contents of the recording and the reproduction-only head 4 of the audio FM after the recording and after the outputs are amplified respectively by a signal amplifier circuit 7, the presence or absence of the output of the signal amplifier circuit 7 and the level of the FM envelope which is the output are judged by a detecting circuit 8. Whether the video and audio signals are recorded without problems is thus checked.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to magnetic recording and reproducing devices such as video tape recorders.

0002

[Prior Art] In recent years, with the spread of the rental market in magnetic recording and reproducing devices such as video tape recorders, the number of dubbing volumes of video soft tapes has increased, so it is now possible to easily and efficiently check the quality of the dubbed tapes. is desired.

[0003] Conventional methods for checking quality include gathering the dubbed tapes in one place and checking all the tapes, or rewinding the tape at the same time as recording ends and checking the reproduced signal.

0004

[Problem to be Solved by the Invention] However, the method for checking the quality of soft tapes as described above is inefficient in terms of time and personnel because the dubbed soft tapes are collected in one place and the playback signals are checked. There was a problem with this.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an efficient apparatus that can check the quality of a dubbed soft tape while recording it.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a recording-only video head and an audio FM head, and a reproduction-only video head for reproducing the recorded content after recording with the recording-only head. head and audio FM head, a modulation circuit that modulates the input signal and inputs it to each of the recording heads, a signal amplification circuit that amplifies the signal from each of the playback heads, and the presence or absence and level of the signal amplification circuit output. This is a magnetic recording and reproducing device equipped with a detection circuit that determines whether there is a problem with video and audio recording.

[0007]

[Operation] In the above configuration, the present invention records the input signal using the recording-only head, reads the recorded video and audio signals using each playback-only head, and detects the presence or absence or level of the signal using the detection circuit. Discern. Therefore, it is possible to automatically check the quality of the soft tape at the same time as dubbing recording.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a block diagram of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, and FIG. 2 similarly shows a block diagram of a cylinder head thereof.

2 is a video recording head, and 3 is an audio F.
M is a recording-only head, 4 is a video playback-only head, and 5 is a head dedicated to video playback.
6 is a modulation circuit that inputs to each recording head, 7 is a signal amplification circuit that amplifies the signal from each playback head, and 8 is the output level of the signal amplification circuit 7. This is a detection circuit that discriminates.

The relationship and operation of each component will be explained below with reference to FIGS. 1 and 2 regarding this embodiment, which is comprised of the above-mentioned components.

When the magnetic recording/reproducing device enters the dubbing state, the video and audio input signals are FM modulated by the modulation circuit 6, inputted to the video recording head 2 and the audio FM recording head 3, and recorded on the tape. It will be done.

Simultaneously with the above recording, as shown in the cylinder head configuration in FIG. 2, after each recording head has recorded, the video playback head 4 and the audio FM playback head 5 read the recorded signals. , is input to the signal amplification circuit 7 as a reproduced signal.

Next, each signal amplified by the signal amplification circuit 7 is input to a detection circuit 8, which detects the presence or absence of the signal and the FM
The level of the envelope of the modulated carrier wave is determined, and it is confirmed whether the video signal and audio FM signal can be recorded without problems.

Although not shown, the detection results of the detection circuit 8 are as follows:
The determination may be made by recording the presence or absence of signal interruption and the degree of level fluctuation using a separate recording device or the like.

As described above, according to this embodiment, video and audio input signals are recorded by each recording head, and at the same time,
Each playback head reads recorded video and audio signals, and a detection circuit determines the presence or absence of the signal or its level. Therefore, it is possible to automatically check the quality of the soft tape at the same time as dubbing recording.

It should be noted that the present invention can be applied not only to dubbing but also to recording of signals that are input without interruption, such as camera input.

Furthermore, as long as the FM modulation recording method is used for recording, it can be applied even if the format and structure of the medium changes.

[0018]

As explained above, according to the magnetic recording and reproducing apparatus of the present invention, in a video tape recorder or the like that dubs soft tapes, video and audio signals are simultaneously recorded using each reproduction head. It can read and automatically check the quality of tapes, eliminating wasted time and manpower, and is of great industrial value as it can improve work efficiency.

[Brief explanation of the drawing]

[Fig. 1] Configuration diagram of one embodiment of the present invention

[Figure 2] Similarly, the head configuration diagram

[Explanation of symbols]

2. Video recording head 3 Audio FM recording head 4. Video playback head 5 Audio FM playback head 6 Modulation circuit 7 Audio amplification circuit

Claims (1)

[Claims] [Claim 1] Recording-only video head and audio F
M head, a playback-only video head that plays back the recorded content after recording with the record-only head, and an audio FM
A modulation circuit that modulates the input signal and inputs it to each of the recording heads, a signal amplification circuit that amplifies the signal from each of the playback heads, and a signal amplification circuit that controls video and audio depending on the presence or absence of the output and its level. A magnetic recording/reproducing device comprising a detection circuit that determines whether there is a problem with recording.