JPH0370284A - Magnetic recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a time-lapse VTRI that records and plays video and audio over a long period of time and is used for wall applications, and in particular, to improve compatibility of audio recording and playback with ordinary VTRs. Regarding sex.

[Conventional technology]

A conventional technique, as described in Japanese Patent Application Laid-Open No. 1-237205, is to record a video signal and a time-axis compressed audio signal alternately on a video track intermittently to extend the recording time of still images with audio. That's what it was.

Devices using this technology cannot record and reproduce audio by continuously driving the tape, and are not compatible with ordinary VTRs.

[Problem to be solved by the invention]

The above-mentioned prior art does not take into consideration compatibility with ordinary VTRs, and is not compatible with tapes in which audio is recorded on linear tracks of continuously driven tapes.

An object of the present invention is to have the function of continuously recording and reproducing long-term audio using a time-axis compressed audio signal, and to record and reproduce audio using a linear track lζ, and to have compatibility with a normal VTR. It is in.

Another object of the present invention is to quickly search a recorded portion caused by an external alarm input during playback.

[Means to solve the problem]

In order to achieve the above objective, in the recording/playback mode in which the tape is driven continuously, the audio signal is recorded and played back as is on the linear track, and in the recording/playback mode in which the tape is driven intermittently, the audio signal is alternately recorded and played back with the video signal. Recording and playback of audio is performed using the time-base compressed audio signal that is recorded.

In addition, in order to achieve the other objectives mentioned above, when recording is performed by external alarm input, the tape is driven continuously and the audio signal is recorded as it is on the linear track, and the near track during high-speed playback is Output the signal as is.

[Effect]

When recording by driving the tape continuously, IJ
Record the audio signal on the near track. Therefore, even if this portion is played back on a normal VTR, the audio will still be output. When playing back by driving the tape continuously (in this case, the audio signal of the linear track is played back. Therefore, it is also possible to play back the sound recorded on a normal VTR. Furthermore, the tape is driven intermittently to record and play back. In this case, audio is recorded and played back using a time-base compressed audio signal.

As a result of the above, it is possible to maintain compatibility with ordinary VTRs while having the function of recording and reproducing continuous audio over a long period of time.

Also, when recording with external alarm input,
An audio signal is recorded on a linear track, and the signal on the next near track is played back during high-speed playback. By searching for the position where the audio signal is present during high-speed playback, it is possible to quickly search for the position where the alarm input has occurred.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

First, the operation of a conventional long-term continuous audio recording/reproducing apparatus using time-base compressed audio signals will be briefly explained.

The audio signal input from the audio input terminal 22 is sent to the recording/playback mode switching circuit 10. A/]) Converter 11. Compression and expansion memo IJ12. D/A converter 13. The signal passes through the recording/reproduction mode switching circuit 14 and becomes a time-base compressed audio signal. This signal is transmitted to the recording amplifier 6 and the recording/reproducing mode switching circuit 48.
As described above, the time axis compressed audio head ZtIh and the like are recorded on the tape 1. ' During playback, the signal picked up by the time-base compressed audio head 2 from the tape 1 is transferred to the recording/playback mode switching circuit 4. Reproduction amplifier 7, recording and reproduction mode switching circuit 10. A/
D Gombaata 11. Compression and expansion memo! 712. D/A/Bata15. It passes through the recording/reproduction mode switching circuit 14 and is output from the audio output terminal 21 as restored and expanded audio. During recording and reproduction, the tape 1 is intermittently driven by a capstan motor 16 controlled by a capstan control circuit 17. Further, the recording/reproduction mode switching circuits 4, 10.14 are switched to the H1 side during recording and to the Lo side during reproduction by the word recording/reproduction mode switching controller 15.

The present invention was realized by adding a circuit for linear audio. The operation will be explained below.

In the recording mode in which the tape is continuously driven, the audio signal input from the audio input terminal 22 is sent from the tape drive intermittent continuous mode switching circuit 20 to the recording amplifier 8. The signal passes through the recording/reproducing mode switching circuit 5 and is recorded on the linear track of the tape 1 from the linear audio head 3. During the playback mode in which the tape is continuously driven, the signal recorded on the linear track of the tape 1 is picked up by the linear audio head 5, and the signal is picked up by the recording/playback mode switching circuit 5. Playback amplifier 9. The signal passes through the tape drive intermittent/continuous mode switching circuit 19 and is output from the audio output terminal 21. Tape drive intermittent continuous mode switching circuit 19.2
0 is tape drive intermittent continuous mode switching controller 18
Therefore, during intermittent driving, the switch is switched to the H1 side, and during continuous drive, it is switched to the Lo(l).The recording/playback mode switching circuit 5 is switched to the H1 side during recording, and to the Lo side during playback, by the recording/playback mode switching controller 15. Further, the capstan control circuit 17 receives a signal from the tape drive intermittent and continuous mode switching controller 18, and drives the tape 1 intermittently or continuously with the capstan motor 16 according to the mode. 4.Furthermore, an alarm input terminal is provided. 23 is
It is connected to a tape drive intermittent/continuous mode switching controller 18, so that when an alarm is input, the recording mode is set to continuous or continuous drive.

In the intermittent drive mode, the tape drive intermittent and continuous mode switching circuits 19 and 20 are switched to the H1 side by the H1 signal from the tape drive intermittent and continuous mode switching controller 15, and the tape drive intermittent and continuous mode switching circuits 19 and 20 are switched to the H1 side. Continuous audio recording and playback for long periods of time becomes possible.

〔Effect of the invention〕

According to the present invention, while having the function of continuously recording and reproducing long-term audio using time-axis compressed audio signals, it is also possible to record and reproduce audio using linear tracks, and it is compatible with ordinary VTRs. It has the effect of keeping the

Furthermore, by recording audio on a linear track when recording by alarm input, there is an effect that the alarm input portion can be quickly searched.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention. 3...Linear audio head 16...Capstan motor 17...Capstan motor control circuit 19.20...
・Tape drive intermittent continuous mode switching circuit 21...Tape drive intermittent continuous mode switching controller 25...Alarm input terminal

Claims (1)

[Claims] 1. In a device that enables continuous recording and playback of audio over a long period of time by alternately recording a video signal and a time-axis compressed audio signal on a magnetic tape, the tape is continuously driven. 1. A magnetic recording and reproducing apparatus characterized in that a magnetic recording and reproducing apparatus is provided with means for recording and reproducing audio using a linear track only in a recording and reproducing mode. 2. In claim 1, audio is recorded on the linear track only when there is an external alarm input,
A magnetic recording and reproducing device that makes it possible to quickly search for alarm input points based on the presence or absence of audio on a linear track during fast-forward playback.