JPH058484B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a magnetic recording/reproducing device (hereinafter referred to as a VTR), and is particularly suitable for recording only audio signals.
Regarding VTR.

[Background of the Invention] Conventionally, when an audio signal is recorded with a fixed head in a VTR, the slower the recording tape speed, the worse the reproduced audio signal becomes. However, the sound quality of audio signals recorded with a rotating head does not deteriorate even if the tape running speed changes somewhat.

Conventional FM audio recording VTRs recorded audio and video signals at the same tape speed, so when recording audio with a rotating head, the above-mentioned advantage of being able to record in a slow speed mode could not be taken advantage of.

[Purpose of the invention]

An object of the present invention is to provide an FM audio recording VTR that automatically records at the slowest tape speed in a mode in which only audio signals are recorded, and can support long-term recording without deteriorating sound quality. be.

[Summary of the invention]

In order to achieve the above object, the present invention provides a tape speed selection switch circuit for instructing one of two or more recording time modes, and for determining whether an input signal is a video signal and an FM modulated audio signal or only an FM modulated audio signal. When the signal input selector switch circuit is switched to the input of the video signal and FM modulated audio signal, the recording time mode instructed by the tape speed selector switch circuit is selected and only the FM modulated audio signal is input. A recording tape speed switching circuit is provided which selects the longest recording time mode irrespective of the instruction from the tape speed switching circuit when the input is switched to .

This allows the operator to select the recording time mode using the tape speed selection switch circuit when recording video signals and FM modulated audio signals.
If you want to record only FM modulated audio signals, you can automatically switch to long-term recording mode.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a block diagram of the signal system circuit section and tape speed control system circuit section of a VTR that records audio FM modulation using a rotating head. In the figure, when the signal input switch circuit 1 is in the audio recording only mode, the recording tape speed switch circuit 10 ignores the mode given by the tape speed switch circuit 4 and automatically It is designed to be in a long-time recording mode.
Furthermore, during playback, the speed mode given by the system control circuit 7 is followed.

FIG. 2 is a circuit diagram showing an example of the signal input switching circuit 1 and tape speed switching circuit 4. In FIG. In the figure, when recording normal audio and video, the output of the signal input switching circuit 1 is L (Low), and the tape speed is controlled by the voltage value output from the tape speed switching circuit 4. The speed discrimination circuit 5 is switched, and the motor is controlled by the drum/capstan speed control circuit 6 accordingly.

For audio-only recording, signal input switching circuit 1
The output becomes H (High), which is ORed by the recording tape speed switching circuit 10, and the input of the tape speed discrimination circuit 5 becomes H regardless of the output from the tape speed switching circuit 4, setting the longest time recording mode to H. By designing, it automatically becomes the longest time recording mode.

According to this embodiment, in a VTR that records audio using a rotating head, in the audio-only recording mode,
It is possible to record for a long time without deteriorating the sound quality of reproduced sound, and the tape cost per hour can be automatically reduced.

〔Effect of the invention〕

As described above, according to the present invention, video signals and
When recording an FM modulated audio signal, the operator can select the recording time mode using the tape speed selection switch circuit, while when recording only an FM modulated audio signal, the operator must switch the signal input selection switch circuit to audio only. It automatically switches to the longest time recording mode and allows you to record for a long time.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the signal input switching/recording/playback circuit section and tape speed switching/control circuit section of a VTR compatible with FM audio recording according to the present invention, and FIG. 2 is a circuit diagram showing an example of the essential parts of the present invention. be. 1...Signal input selector switch circuit, 2...Input signal processing circuit, 3...Signal recording/reproducing circuit, 4...
...Tape speed selection switch circuit, 5...Tape speed discrimination circuit, 6...Drum/capstan speed control circuit, 7...System control circuit, 8...Rotating head and cylinder, 9...Capstan, 10...Recording tape Speed switching circuit.

Claims (1)

[Claims] 1. Has a function to switch between recording video signals and FM modulated audio signals with a rotating head and recording only FM modulated audio signals, and has two or more recording time modes with different magnetic tape tape speeds. In a magnetic recording/reproducing device, a tape speed changeover switch circuit for instructing one of the above two or more recording time modes, and a signal input changeover circuit for changing over whether an input signal is a video signal and an FM modulated audio signal or only an FM modulated audio signal. When the switch circuit and the signal input selector switch circuit are switched to input video signals and FM modulated audio signals, the recording time mode specified by the tape speed selector switch circuit is selected and only FM modulated audio signals are input. A magnetic recording/reproducing apparatus comprising: a recording tape speed switching circuit which selects the longest recording time mode regardless of the instruction from the tape speed switching circuit when switched.