JPS607641A - Magnetic picture recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain the recording of only audio signals by providing the titled device with a switching means applying a reference signal from a reference signal generating circuit to a control circuit at the recording of only an audio signal or normal reproducing and applying a reference signal based upon a video signal to the control circuit at the recording of the video signal. CONSTITUTION:When an alteration switch 13 is turned to the contact (c) side at the recording of audio signals, a reference signal from the reference signal generating circuit 5 is applied to a motor control circuit 4. Even if a video signal is not inputted at the recording of only the audio signal, the motor control circuit 4 controls a drum 6 and a capstan motor 7 on the basis of the reference signal from the reference signal generating circuit 5 and enables a control head 8 to record a signal on a magnetic tape.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing device, and more particularly to a magnetic recording and reproducing device that can record only audio signals.

FIG. 1 is a diagram showing the configuration of a conventional magnetic recording/reproduction [f Rf H&. In Figure 1, there is J3, and the video signal is video A.
It is applied to the signal recording circuit 1 and the synchronization separation circuit 2. The synchronization separation circuit 2 separates the synchronization signal from the video signal, converts the synchronization signal into an M single signal, and supplies it to the motor control circuit 4 via one contact of the C cutoff switch 3. The other side contact of the changeover switch 3 receives the reference signal from the reference signal generation circuit 5! )available. The motor control circuit 11 controls the cylinder drum 6 based on a synchronization signal or a reference signal.
and controls the capstan motor 7, and causes the control head 8 to record control signals on the magnetic tape 9. The capstan motor 7 drives the magnetic tape 9 to make it run. Further, the cylinder drum 6 is provided with a pair of video heads 10.10 and a pair of audio heads 11.11, and a video signal is applied to the video heads 10.10 from the video signal recording circuit 1 described above. Also, audio head 11.11
An audio signal is applied to the audio signal recording circuit 12 via an audio signal recording circuit 12.

In the conventional magnetic recording and reproducing apparatus configured as described above, synchronous separation is performed from the input video signal so that one frame of the video signal is recorded according to the standard while the cylinder drum 6 rotates once during recording. The cylinder drum 6 and the capstan motor 7 are controlled by the motor control circuit 4 based on the vertical synchronization signal synchronously separated by the circuit 8 . Then, the control 1 to roll signals are recorded on the magnetic tape 9 by the control head 8. Further, during normal reproduction, the changeover switch 3 is switched to the reference signal generation circuit 5 side, and the motor control circuit 4 rotates the cylinder drum 6 at a constant speed based on the reference signal from the reference signal generation circuit 5. At the same time, the control signal recorded on the magnetic tape 9 is reproduced by the control head 8, and controlled so that the signal on the magnetic tape 9 matches the position of the trace by the video head 10.10 and the audio head 11.11.

Incidentally, the maximum recording time in a conventional magnetic recording/reproducing device is much longer than that in a ten-dio recorder, such as eight hours in Vl-I8.

For this reason, in FM air checks, etc.,
It would be very useful if the above magnetic recording/playback device could record only audio signals. However, in conventional magnetic recording/playback devices, the same 111ff signal separated from the video signal is used as the reference signal during recording, so even if an attempt is made to record only the audio signal, the reference signal is not sent to the motor controller 1' and roll circuit 4. The disadvantage was that it could not be recorded because it was not given.

Therefore, the main object of the present invention is to provide a magnetic recording and reproducing apparatus that can normally record and reproduce audio signals even when no video signal is input.

To summarize the invention, a rotary cylinder drum having a video signal recording and reproducing head and an audio signal recording and reproducing head, a capstan motor that drives a magnetic tape,
A reference signal generation circuit that generates a reference signal and a motor controller 1 that controls the rotating cylinder drum and capstan motor.
~ In a magnetic recording/playback device equipped with a roll circuit, when recording only audio signals, the signal from the reference signal generation circuit, which is required during normal playback, is used as the reference signal for the motor control circuit, and the rotation can be continued even when no video signal is input. This is a magnetic recording and reproducing device that controls a cylinder drum and a capstan motor, and is configured so that a roll signal can be recorded on a magnetic disk as well as on a controller 1.

The above object J3 and other objects and features of the present invention will become more apparent from the detailed description given below with reference to the drawings.

FIG. 2 is a schematic block diagram showing the configuration of an embodiment of the present invention. The embodiment shown in FIG. 2 is the same as FIG. 1 except for the following points. That is, a changeover switch ``13'' is provided to change the mode, and this changeover switch ``13'' is provided to change the mode.
3 is a contact a for selecting a video signal recording mode;
It includes a contact point for selecting the normal playback mode and a contact point C for selecting the audio signal recording mode. The output of the synchronous separation circuit 2 is connected to the contact a, and the output of the reference signal generation circuit 5 is connected to the contact C. Therefore, when the changeover switch 13 is switched to the contact a side,
A synchronization signal separated from the video signal by the synchronization separation circuit 2 is given to the motor control circuit 4 as a reference signal. Further, when the changeover switch 13 is switched to the contact side during normal reproduction, the 113 signal from the reference signal generation circuit 5 is applied to the motor control circuit 4. Furthermore, when the changeover switch 13 is switched to the contact C side during audio signal recording, which is a feature of the present invention, the reference signal generation circuit 5
A reference signal from the motor control circuit 4 is applied to the motor control circuit 4. That is, even if no video signal is input when recording only audio signals, the motor control circuit 4 controls the drum 6 and capstan motor 7 based on the reference signal from the reference signal generation circuit 5, and the control head 8 controls the drum 6 and the capstan motor 7. Control signals can be recorded on the magnetic tape 9.

As described above, according to the present invention, since the drum and capstan motor are controlled using the reference signal required for normal playback when recording only the audio and f-o signals, the video signal Even if there is no input, only the audio signal can be recorded.

Furthermore, since the video signal is not recorded, crosstalk interference from the video signal to the audio signal on the m-air tape is reduced, and recording with improved sound quality can be achieved. Therefore, it is very useful for checking the air of Ftvl broadcasting.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of a magnetic recording and reproducing apparatus which is the background of the present invention. FIG. 2 is a schematic block diagram of an embodiment of the present invention. In the figure, 1 is a video signal recording circuit, 2 is a synchronization separation circuit, 4 is a motor control circuit, 5 is a reference signal generation circuit, 6 is a rotating cylinder drum, 7 is a capstan motor, 8 is a control head, and 9 is a magnetic tape. , 10 is a video sub-head, 11 is an audio head, 12 is an I-diode signal recording circuit, 13t, ! Shows the changeover switch. Agent Masuo Iwa

Claims (1)

[Claims] A rotating cylinder drum including a video bow recording/playback head and an audio signal recording/playback head, a capstan motor for driving a magnetic tape, and generating a reference signal required during normal playback. In a magnetic recording and reproducing apparatus including a reference signal generation circuit and a control circuit for controlling the drum and the capstan motor, further when recording only audio signals and during normal playback,
A magnetic recording/reproducing apparatus, characterized in that the magnetic recording/reproducing apparatus is provided with a switching means for supplying a reference signal from the reference signal generating circuit to the control circuit, and for supplying a reference signal based on the video signal to the control circuit when recording the video A signal.