JPS63222382A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To easily enable a correct setting of a recording or reproducing level by displaying on a monitor screen a sound signal level at the time of sampling for digitalization in the case of the recording/reproducing of the sound signal only. CONSTITUTION:The sound signal impressed to a sound input terminal 1 is sampled by an A/D converter 2, and its sound level is converted into a digital signal which is then inputted into a digital signal processing circuit 3. And, at the time of reproduction, a reproducing sound signal is impressed to the circuit 3, and a digitized sound signal is outputted from the circuit 3 into a D/A converter 4 in either case of recording/reproducing. This signal is outputted via a digital processing circuit 7 as a sound level display signal to be displayed on the monitor screen. By this method, the recording/reproducing can easily be carried out at an adequate level.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a magnetic recording and reproducing device that digitizes and records and reproduces video and audio signals such as a VTR, and particularly when recording and reproducing only audio signals. The present invention relates to a magnetic recording/reproducing device that displays its recording/reproducing level on a video monitor.

(Prior Art) There are magnetic recording and reproducing apparatuses such as VTRs that record and reproduce video signals and digitized audio signals (hereinafter simply referred to as digitized audio signals). In such devices, when only audio signals are recorded and played back, no consideration is given to the processing of the video signal system including the video monitor (hereinafter simply referred to as the monitor), and therefore there is no signal from the video signal output. There is a drawback that a noise signal or a digitized audio signal is output.

(Problem to be Solved by the Invention) Therefore, even if an operator attempts to record and play back only audio signals, the operator will have to view unnecessary images on the monitor or turn off the power switch of the monitor each time. There was the hassle of having to do this.

The present invention aims to solve the above problems.

(Means for Solving the Problems) The present invention achieves the above object by utilizing a video signal system that is not relevant in the case of recording and reproducing only audio signals.
This is achieved by displaying the audio signal level at the time of sampling when converting the original analog signal into digital, and the presence or absence of the video signal at a predetermined position on the monitor.

(Function) According to the present invention having the above configuration, the audio signal level at the time of sampling when the audio signal is digitized is displayed on the monitor screen, so the monitor image is no longer an image that does not need to be viewed, and there is no possibility of failure. The audio level that should be actively monitored for recording and playback is displayed, making it possible to set the recording or playback level correctly.

(Examples) Hereinafter, the present invention will be explained in detail by examples using the drawings.

To help understand the present invention, Figure 1 shows how an audio signal is digitized. (1) shows an audio signal in an analog state, and (2) shows that it is sampled at a constant sampling frequency. (3) shows the 6-bit quantization level of the sampled audio signal.

FIG. 2 is a block diagram showing a magnetic recording/reproducing apparatus according to an embodiment of the present invention, and shows a case where only audio signals are digitized and recorded/reproduced.

In the figure, an audio signal applied from an audio input terminal 1 is a certain instantaneous audio level sampled by an A/D (analog-digital) converter 2, which is converted into a digital signal and sent to a digital signal processing circuit 3. is input. During recording, a digitized audio signal is output as a recording signal from the digital signal processing circuit 3, is recorded by a configuration not shown, and at the same time is branched for monitoring and sent to a D/A (digital-to-analog) converter 4. The analog audio signal is applied to the audio output amplifier 5, and the audio signal amplified there is output from the audio output terminal 6.

During playback, a playback audio signal from a mechanism (not shown) is applied to the digital processing circuit 3, where the playback signal is processed, converted into an analog signal by the D/A converter 4, and sent to the audio output terminal at the same time as recording. 6 as an audio signal.

As can be seen from the above, a digital audio signal is output from the digital signal processing circuit 3 to the D/A converter 4 even in the case of recording/playback, and this means that the level of the audio signal at the time of sampling is It has been transformed into Therefore, the signal is applied to the digital processing circuit 7 and processed into a data signal suitable for indicating the level of the audio signal. Further, the video signal generation circuit 8 outputs a video signal,
The processed audio level display signal data is output to a predetermined position specified by the output timing signal.

9 is a switch circuit that outputs signal data for audio level display;
The video signal generated by the video signal generation circuit 8 is switched and applied to the switch circuit 10. Here, the video signal that displays the audio level applied as described above and the video signal that is normally recorded and played are switched, and the output is passed through the video output amplifier 11 to the video output terminal 12.
The signal is output to a monitor (not shown), and the audio level is displayed as an image on the screen.

As described above, the present invention utilizes digitized signal data indicating the sampling level necessary to digitize the audio signal when recording and reproducing only digitized audio signals on a VTR or the like. The level of the audio signal is displayed on the monitor using a video signal system.

(Effects of the Invention) As is clear from the above detailed explanation, the present invention is an apparatus for recording and reproducing video signals and audio signals, and when recording and reproducing only digital audio signals, unnecessary video Since the signal system is used to output a video signal that displays the audio signal level using sampled signal data, it goes without saying that the monitor as part of the recording/playback device can be used effectively.
Recording and reproduction can be easily performed at an appropriate level, and therefore, it can be used in VTRs and the like to greatly benefit.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing digitization of an audio signal used in the present invention, and FIG. 2 is a block diagram showing an embodiment of the present invention. 1...Audio input terminal, 2...A/D (analog-digital) converter, 3...digital signal processing circuit, 4...D/A (digital-analog) converter, 5... -Audio output amplifier, 6...Audio output terminal. 7... Digital processing circuit, 8... Video signal generation circuit, 11... Video output amplifier, 12... Video output terminal. Patent applicant: Matsushita Electric Industrial Co., Ltd. Figure 1 (1) Audio No. 48

Claims (1)

[Claims] A magnetic recording and reproducing device for recording and reproducing video signals and digitized audio signals is configured to be capable of recording and reproducing only the audio signals, and when recording and reproducing, a video signal system including a video monitor is used. A magnetic recording/reproducing device characterized in that a recording/reproducing level of an audio signal is displayed using a sampling level of the audio signal.