JPS6093606A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain recording longer than ordinary methods by selecting any one of the 1st mode recording/reproducing a video signal and the 2nd mode recording/reproducing only an audio signal, and when the 2nd mode is set up, using a signal having necessary faithfulness is used as the audio signal. CONSTITUTION:In the mode reproducing the audio signal, a switch S1 is connected to a reference oscillator 12, a pulse signal 22Hz is supplied to a servo circuit 5 and the rotational frequency and phase of a head motor 8 are controlled to execute servocontrol at the reproduction of an audio signal by a rotary head 7. On the other hand, a control head 10 detects a control signal corresponding to the output of a reference oscillator 13 from a magnetic tape 6. The control signal is connected to the reference oscillator 13 and a synchronized output is sent. A servo circuit 4 is synchronized with the output of the reference oscillator 13 and drives a capstan motor 9 at the frequency of N or 1/N times the output of the reference oscillator 13. Thus, the travelling speed of the magnetic tape 6 corresponds to the frequency of the output of the reference oscillator 13 and is synchronized with the control signal at its phase.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a magnetic recording and reproducing device that can select one of a first mode for recording and reproducing video signals and a second mode for recording and reproducing audio signals. be.

BACKGROUND ART It is known from Japanese Patent Publication No. 58-13964 to record and reproduce audio signals using a rotating head type magnetic recording and reproducing device for recording and reproducing video signals. Japanese Patent Publication No. 58-13904 discloses that a rotary head type device has a wide recording band and can record even high frequency signals. On the other hand, in rotary head type magnetic recording and reproducing devices, the relative speed between the rotary head and the magnetic tape is set based on the recording and reproducing of video signals, so there is a necessary speed when recording audio signals.
Second, magnetic tapes have not been used effectively when recording and reproducing audio signals because they are converted into signals with high fidelity (eg, F?. signal) and the recording time is limited.

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above points, and includes a first mode for recording and reproducing video signals (including cases in which an audio signal is superimposed on a video signal) using a rotating head type magnetic recording and reproducing device. You can choose between a second mode in which only audio signals are recorded and played back, and when set to the second mode, the audio signals have the necessary fidelity and can be recorded for longer periods of time than before. The present invention provides a magnetic recording and reproducing device.

Therefore, in the present invention, the relative velocity between the rotary head and the magnetic deso in the first mode is different in the second mode.

As a result, with the rotary head type magnetic recording and reproducing apparatus of the present invention, video signals can be recorded and reproduced as before, audio signals can be recorded and reproduced with the necessary level of fidelity, and can be recorded for a longer time than before. (reproduction), the magnetic tape can be used effectively even when recording and reproducing A-dio signals, making it practical.

Best mode for carrying out the invention Hereinafter, explanation will be made according to the drawing shown in FIG.

Reference numeral 1, not shown, is a recording playback circuit of a VTR, which is connected to a contact V of a switch So. Reference numeral 2 denotes a recording/reproducing circuit for audio signals (for example, digital audio signals, FM modulated audio signals), and is connected to a contact point of the switch So. Switch So is connected to video head 7. The recording/reproducing circuit 1 is also connected to a contact R1 of a switch S1 via a synchronization separation circuit 3. Note that 6 is a magnetic tape. Now, the reference oscillator 11 is connected to the contact P1 of the switch S1, and the reference oscillator 12 is connected to the contact A1 of the switch S1. and switch S
1 is connected to the head motor 8 via the servo circuit 2, and is connected to the contact R3 of the switch S3 and the switch S2.
It is connected to contact R2 of. Contact P2 of switch S2
and contact 1)3 of switch S3 are connected. A reference oscillator 13 whose trigger input terminal is connection A2 of switch S2 is connected to contact A3 of switch S3.
3 is connected to a capstor/motor 9 via a servo circuit 4. Also, switch S2 is control head 1
Connected to 0. In addition, 20 is various switches SO~
A mode setting circuit that provides a control output for switching S3 to each switch SO to S3 switches the connection of the switches SO to S3 in accordance with various modes as shown in the following table.

Next, the operation will be explained. B) In the "o signal recording mode," a high frequency signal (correctly, a video signal converted to t:1 frequency) is sent out from the recording/reproducing circuit 1, and the high frequency signal is supplied to the rotating head 7 via the switch SO. At the same time, the video signal is sent from the recording/reproducing circuit 1 to the synchronization separation circuit 3, where the vertical synchronization signal is separated and extracted.

This vertical synchronization signal is transmitted to the servo circuit 2 via switch Sl.
As is well known, the rotational speed and phase of the head motor 8 are controlled, and servo control is performed when the rotary head 7 records a video signal. A frequency dividing circuit is arranged in the servo circuit 2, and for example, a frequency dividing circuit is arranged in the servo circuit 2.
A control signal having a frequency of is supplied to the control head 10 via the switch S2, and the control signal is recorded on a predetermined track of the magnetic tape 6.

The control signal is also supplied to the servo circuit 1, which drives the capstan motor 9 with an output of a frequency of N or 1/N (N is a positive integer) in synchronization with the control signal. Travel speed is controlled.

In the mode for reproducing a video signal, a weak high frequency signal taken out from the magnetic recording device is supplied to the recording/reproducing circuit 1 via the switch SO, where it is detected and the video signal is reproduced. At this time, the switch 31 is connected to the reference oscillator +
For example, a pulse signal of 0011Z is supplied to the servo circuit 2 via the switch 31, and the rotation speed and phase of the head motor 8 are controlled. Child control is done. On the other hand, the control head 10 detects a control signal from the magnetic tape 6. This control signal is then supplied to the servo circuit 1 via the switch S2.

This allows it to synchronize with the control signal in the same way as when recording.
(con) l: The capstor/motor 9 is driven by the N or 1/N output of the I-L signal No. 4, and the running speed of the magnetic tape is controlled. In the audio signal recording mode, a digitized (or frequency modulated) audio signal is supplied from the recording/reproducing circuit 2 to the rotary head via the sent switch SO, and the audio signal is recorded on the magnetic recorder. Ru. At this time, the switch S1 is connected to the reference oscillator +2, and a pulse signal of, for example, 22117 is supplied to the servo circuit 2 (jl-) via the switch S1, the rotation and phase of the head motor 8 are controlled, and the audio signal Ii+ of the rotary head 7 is !Servo control is performed during recording.Then, from the servo circuit 2, the switch S2
to the control 1J-le head 10 via the Noss quasi oscillator 1
A control signal having tQ frequencies of 172 of 2 is supplied, and the control signal is recorded on the magnetic data recorder. Further, the switch S3 is connected to the reference oscillator 13, and the servo circuit 4 is connected to the output (for example, +70) of the reference oscillator 1:
N or I of the output of the reference oscillator 13
The capstan/motor 9 is driven by an output with a frequency of /N. Therefore, the running speed of the magnetic tape is determined by the reference oscillator 13.
In the mote that reproduces an audio signal that conforms to the frequency of the output of . At this time, the switch 31 is connected to the reference oscillator 12, and the pulse signal of 22IIZ is transmitted to the switch S1.
The rotational speed and phase of the head motor 8 are controlled, and servo control is performed when the audio signal of the rotary head 7 is reproduced. On the other hand, m
The control head 10 detects a control signal from the magnetic tape 6 (in accordance with the output of the quasi-oscillator 13).

This control signal is input via switch S2 (
It is connected to the oscillator 13, and the oscillator 13 has ':j/tI
J-L signal is supplied and a synchronized output is sent out. The servo circuit 4 is synchronized with the output of this reference oscillator 13,
The Toyabustan motor 9 is driven by the output of the reference oscillator 13 at a frequency of N or I/N. Therefore, the running speed of the magnetic tape is in accordance with the frequency of the output of the reference oscillator 13, and is also phase-synchronized with the controller No. 1 No. 11.

According to the present invention as described above, the relative illumination between the rotary head and the magnetic tape during recording and reproduction of video signals is
l! The relative speed of the rotation head and the magnetic tape during recording and reproduction of audio signals can be made different depending on the degree of rotation. Therefore, if an audio signal is to record or reproduce a signal (such as a digital signal or FM signal) that requires the necessary level of fidelity, it must be Since magnetic tape can be used for recording (reproduction) for a longer period of time, it is practical to use magnetic tape.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing one embodiment of the present invention. SO・1・Switch to select the first mode and the second mote. Patent Applicant NEC Home Electronics Co., Ltd. Figure 1 Procedural Amendment, to. 1983 4J] 2 Ushiichi, Commissioner of the Patent Office, 1982 (1' Special Application No. 12/2003 λ Title of the invention: Magnetic recording 1 Recording device 3, Person making the amendment 4 Amending order dated 1973) !January 311'+ (Delivery "") 5. Statement subject to amendment. 6. Engraving of the statement of contents of the amendment. (No change in content.)

Claims (1)

[Scope of Claims] A first mode in which a video signal superimposed with an audio signal or simply a video signal is recorded or generated on a magnetic tape by a rotating head, and only an audio signal is recorded on a magnetic tape by the rotating head. A magnetic recording PF generation device capable of selecting a second mode in which recording or reproduction is performed on the magnetic tape, wherein when the first mode is selected, the niI magnetic tape and the 011゛ rotary head have a first relative speed. , when the second mode is selected, the magnetic tape and the magnetic head are set at a second relative speed different from the first relative speed.
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