JPH05109238A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To enable the editing work with high accuracy without shifting an editing point by making the reproducing pausing state of a recording side VTR presently under the recording pausing state by pressing player key at the time of editing and confirming a reproducing picture of the recording side VTR without operating a shuttle key. CONSTITUTION:The subject device is capable of recording a video and audio signals in forming slant tracks on a magnetic tape 10 or reproducing the video and audio signals recorded on the magnetic tape 10. In this VTR, the recording side VTR is made to be capable of changing the recording pausing state to the reproducing pausing state by pressing only the player key 18b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus suitable for application to a VTR such as a so-called 8 mm video tape recorder.

[0002]

2. Description of the Related Art Conventionally, so-called 8 mm video tape
A VTR such as a recorder has a dedicated control terminal which is convenient for editing work such as recording an image from another device.

This control terminal makes it possible to operate the other device by operating the operation key of one device when the two devices are connected, or to reproduce the reproduced signal reproduced by one device by the other device. The so-called editing for recording can be performed by synchronizing one device and the other device.

Further, a VTR or the like having such a control terminal is equipped with a selection key for selecting whether to control itself or another machine connected to itself with an operation key. Has been done.

Further, in the above-mentioned editing, a so-called shuttle key which is a widely known variable speed reproduction key is used.

The shuttle key is a key for reproducing at a speed corresponding to the rotation angle.

At the time of editing, the playback VTR is set to the playback suspension state, the recording side VTR is set to the recording suspension state, and in this state, the shuttle key is used to perform the playback side VTR.
Determine the part of TR that you want to record, that is, edit point,
The edit point of the recording VTR is determined.

The actual editing is performed as follows.

First, in connection, the video and audio output terminals of the reproducing VTR are connected to the video and audio input terminals of the recording VTR, respectively, and the above-mentioned control terminals are connected to each other.

At this time, the video and audio output terminals of the VTR on the recording side are connected to the monitor television.

When the key for starting editing is pressed,
As described above, the playback VTR is in the playback paused state, and the recording side VTR is in the recording paused state.

In this state, the control by the operation key is selected for the reproducing VTR, and first, the head of the portion to be reproduced on the reproducing VTR, that is, the editing point is searched by operating the shuttle key.

At this time, a reproduced image of the magnetic tape set on the recording-side VTR is displayed on the tube surface of the television monitor connected to the recording-side VTR.

Next, the control by the operation keys is selected for the recording side VTR, and the head of the portion to be recorded of the recording side VTR, that is, the editing point is searched by operating the above-mentioned shuttle key.

At this time, a reproduced image of the magnetic tape set in the reproducing VTR is displayed on the tube surface of the television monitor connected to the reproducing VTR.

After that, by pressing a predetermined start key, the reproducing side VTR starts reproducing and the recording side VT.
R starts recording, and the reproduced signal reproduced by the reproducing VTR is recorded on the magnetic tape of the recording VTR.

As described above, conventionally, the control terminals of the reproducing side VTR and the recording side VTR are connected to each other, and the recording side VT is connected.
Operate various operation keys of R to play VTR and record V
The edit point of TR is determined, and thereafter, the reproduction signal reproduced by the reproduction side VTR is recorded on the magnetic tape of the recording side VTR while the reproduction side VTR and the recording side VTR are synchronized.

[0018]

By the way, in the case of editing using a VTR as described above, in order to see the image of the magnetic tape set in the recording VTR for confirming the editing point, It is necessary to operate the select key to select the object to be controlled, and then to operate the shuttle key after setting the VTR on the recording side, which is bothersome to the user and the editing point once set may be misaligned. There was an inconvenience.

Further, when the edit points of the recording-side VTR and the reproducing-side VTR are determined at the time of editing, the shuttle key for reproducing at the speed corresponding to the rotation angle is used. It was difficult to match with accuracy.

The present invention has been made in view of the above point, and the editing point on the recording side can be confirmed, whereby the editing can be accurately performed at the desired editing point, and the operability can be improved. It is intended to propose a recording / reproducing apparatus.

[0021]

In the magnetic recording / reproducing apparatus of the present invention, as shown in FIGS. 1 to 7, for example, a signal is recorded or recorded from the magnetic recording medium 10 so as to form an inclined track on the magnetic recording medium 10. In a magnetic recording / reproducing apparatus adapted to reproduce a signal, when recording an input signal from the outside, when the recording is suspended, the reproduction is suspended by a predetermined operation. ..

The magnetic recording / reproducing apparatus of the present invention is shown in FIG.
As shown in FIG. 7, in order to perform variable speed reproduction in a magnetic recording / reproducing apparatus adapted to record a signal so as to form an inclined track on the magnetic recording medium 10 or reproduce a signal recorded from the magnetic recording medium. First operation button 18
g, a second operation button 18d for reproducing each frame, and switching means 18b, 18c for switching control by operating the first and second operation buttons 18g and 18d to the main unit or another unit 6, 7 and 7.

[0023]

According to the present invention described above, when recording an input signal from the outside, when the recording is paused, the reproduction is paused by a predetermined operation.
The editing point on the recording side can be confirmed without operating the shuttle key, which allows the editing to be performed accurately at the desired editing point.

Further, according to the present invention described above, the control by the first operation button 18g for performing variable speed reproduction and the second operation button 18d for performing reproduction for each frame is performed by the main unit or another unit 6 Since it can be switched to, it is possible to perform editing at a desired editing point with high precision and improve operability.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the magnetic recording / reproducing apparatus of the present invention will be described in detail below with reference to FIG.

In FIG. 1, reference numeral 1 denotes an antenna, which receives a television broadcast.

The television signal received by the antenna 1 is supplied to the television tuner 2, and is supplied by the television tuner 2 as a video signal and an audio signal to the recording system signal processing circuit 8 via the fixed contact 5a of the switch 5. To be done.

The contacts and output terminals described below are
For simplification of description, it is assumed that the image is composed of video, left audio, and right audio.

Reference numeral 3 denotes a satellite dish receiving parabolic antenna. A satellite broadcast received signal received by the antenna 3 is received by a BS tuner 4, and the BS tuner 4 serves as a fixed contact of a switch 5 as a video signal and an audio signal. It is supplied to the recording system signal processing circuit 8 and a fixed contact 13c of a switch 13 described later via 5b.

In the switch 5 described above, the movable contact 5e is connected to each fixed contact 5a, 5b, 5c or 5d under the control of the control circuit 7.

The fixed contacts 5c and 5d of the switch 5 are fixed contacts for external input which are connected to the output terminals of another device (VTR, camera-integrated VTR, etc.) 6 as in the example of this figure. It is said that.

A signal to be recorded is supplied to the recording system signal processing circuit 8 and the output terminal 13e via the movable contact 5e of the switch 5.

The signal supplied to the output terminal 13e is
Since this is the signal to be recorded, for example, this output terminal 1
If a television monitor is connected to 3e, the recorded image can be viewed, and, for example, this output terminal 13
If a VTR is connected to e, it is possible to record a signal with this unit and the same signal to this VTR.

The control circuit 7 controls the switches 5, 13 and 14 according to the operation of the operation keys of the operation panel 18, and is connected to the fixed contact for external input as shown in this figure. The other device 6 is controlled through the control terminal of the other device 6 which is set.

As described above, this control is a control in which the control terminals of two devices are connected to each other, and the other device is operated by the operation keys of one device, for example.
It is generally called rank communication.

The video signal and the audio signal (PCM audio signal) supplied to the recording system signal processing circuit 8 are supplied to the magnetic head 9 after being subjected to signal processing, respectively, and are supplied to the magnetic tape 10 by the magnetic head 9. It is recorded to form a tilted track.

The video signal and audio signal thus recorded are reproduced from the magnetic tape by the reproducing head 11 and supplied to the reproducing system signal processing circuit 12, respectively.

The reproduction system signal processing circuit 12 performs signal processing on the video signal and the audio signal from the magnetic head 11, respectively, and outputs these reproduction signals to the fixed contact 1 of the switch 13.
Supply to 3a.

Under the control of the control circuit 7, the switch 13 connects the movable contact 13d to each of the fixed contacts 13a, 13b or 13c, and the reproduction signal reproduced from the magnetic tape 10 should be recorded on the magnetic tape 10. Either the signal selected by the switch 5 or the video and audio signals of the satellite broadcast from the BS tuner 4 is supplied to the adding circuit 16.

The adder circuit 16 adds the character data supplied from the character generator 15 via the switch 14 and the signal from the switch 13, and supplies the added signal to the television monitor 17.

Thus, on the screen of the television monitor 17, the reproduced signal reproduced from the magnetic tape selected by the switch 13, the signal selected by the switch 5 to be recorded on the magnetic tape, and the BS tuner 4 are recorded. A signal obtained by adding character data to any of the satellite broadcast video signals is displayed, and the reproduction is performed from the magnetic tape selected by the switch 13 from the speaker of the television monitor 17 (not shown). Any of the signal, the signal selected by the switch 5 to be recorded on the magnetic tape, and the satellite broadcast audio signal from the BS tuner 4 are output.

Next, the operation panel 18 will be described. 18a is an operation button group, and this operation button group is a known V group.
Various TR operation keys and a “BS monitor” key described later are arranged.

Reference numeral 18b is a player key, and 18c is a record key. As described above, the control terminal of another machine and the control terminal of this machine (control circuit 7 in this figure) are connected to perform rank communication. This is a selection key when set to.

That is, this is a key for selecting whether to operate this machine or another machine by operating each key described below.

When the player key 18b is pressed,
By operating the operation keys of this machine, you can operate the other machine 6 described above.
When the record key 18c is pressed, this machine can be operated with the operation keys of this machine.

Reference numeral 18d denotes a frame key, and each time the left side of the frame key 18d is pressed, reproduction can be performed for each frame in the reverse direction from the magnetic tape of this machine or another machine 6, and the right side of the frame key 18d. This is a so-called frame advance key that can reproduce each frame in the forward direction from the magnetic tape of this machine or another machine 6 every time is pressed.

Reference numeral 18e designates an edit standby key. By pressing the edit standby key 18e, the other device 6 on the reproducing side can be put into the reproduction paused state, and the main unit on the recording side can be put into the recording paused state.

That is, this edit standby key 18
When e is pressed, the control circuit 7 puts the other device 6 into the reproduction paused state by the rank communication, and further puts this unit into the recording paused state.

Reference numeral 18f is a start / pause key. Whenever the user presses this key 18f to edit by connecting the other device 6 and this device as shown in this figure, the other device 6 starts playback and the The recording is started by the machine, the other machine 6 is put into the reproduction pause state, and the operation of the main body is put into the recording pause state alternately.

The shuttle key 18g is a key capable of reproducing at a speed corresponding to the rotation angle as described above.
As shown in this figure, the shuttle key 18g
When it is rotated in the direction of 1, the variable speed reproduction in the reverse direction is performed, and when the shuttle key 18g is rotated in the direction of the arrow r2, the variable speed reproduction in the forward direction is performed.

That is, as shown in this figure, the other device 6 and this device are connected for rank communication, and the output terminal of the other device 6 is connected to the input side (switch 5) of this device to reproduce the other device 6. When a signal is recorded on the magnetic tape of this machine, that is, when so-called editing is performed, by pressing the player key 18b described above, the other machine 6 can be operated by the frame key 18d and the shuttle key 18g, and the record key 18c described above can be operated. When pressed, the frame key 18d and the shuttle key 18g can operate the machine.

Next, referring to the flow chart of FIG. 2, the operation in the editing work in which the other device 6 is connected to this device as shown in FIG. 1 and the reproduction signal of the other device 6 is recorded on the magnetic tape 10 of this device. Explain.

First, in step 100, the operation panel 18
When the edit standby key 18e is pressed, the other device 6, which is the VTR on the reproducing side, is set to the reproduction temporary stop state and the main unit is set to the recording temporary state. And step 110
Move to. At this time, the movable contact 5e of the switch 5 described in FIG. 1 is connected to the fixed contact 5c.

In step 110, the player key 18b
Is ON, and if "YES", step 1
If No, the process proceeds to step 130.

At step 120, the control mode of the other device 6 is set. Then, the process proceeds to step 110 again.

At this time, the control signal from the control circuit 7 described in FIG. 1 is supplied to the switch 13, and the movable contact 13d of the switch 13 is connected to the fixed contact 13b.

At this time, the control circuit 7 controls the character generator 15 to output character data such as "reproducer screen", and also supplies a control signal to the switch 14 to turn on the switch 14. ..

In this way, the video signal reproduced by the other device 6 and the character signal from the character generator 15 are respectively supplied to the addition circuit 16, and these are added in the addition circuit 16 to form an addition signal. Are supplied to the television monitor 17.

Therefore, as shown in FIG. 5A, a reproduced image of the other device 6 is displayed on the screen of the television monitor 17, and a display such as a "reproducer screen" indicating that the reproduced image of the other device 6 is displayed. Is done.

Further, the control circuit 7 obtains the count information from the other machine 6, controls the character generator 15 based on this information, and outputs the numerical data according to the obtained count information.

Then, a control signal is supplied to the switch 14 to turn on the switch 14.

Thus, the character generator 15
The numerical character signal which is the count value of the other device 6 is supplied to the addition circuit 16, and the reproduction video signal and the numerical character signal from the other device 6 are added in the addition circuit 16, and the addition signal is added to the television monitor 17. Is supplied to.

Therefore, as shown in FIG. 6A, the reproduced image of the other device 6 is displayed on the screen of the television monitor 17 and the count information of the other device 6 is displayed.

By doing so, it is possible to easily determine whether the other device 6 or the main device is currently controlled, and more accurate editing can be performed by the value of the counter.

At this time, the television monitor 17
While looking at the tube surface, the shuttle key 18g is used to set the desired reproduction position, and the frame key 18d is used to determine the desired reproduction start position, that is, the edit point in frame units.

The determined reproduction start position information is supplied to and stored in the control circuit 7 of this unit by, for example, the above rank communication.

The display indicating that the image is from the other device 6 and the counter from the other device 6 may be displayed at the same time.

In step 130, the record key 18c
Is ON, and if "YES", step 1
If it is “NO”, the process proceeds to step 180.

In step 140, the recorder is changed from the recording pause state to the reproduction pause state. And step 15
Move to 0.

At this time, the control signal from the control circuit 7 described in FIG. 1 is supplied to the switch 13, and the movable contact 13d of the switch 13 is connected to the fixed contact 13a.

At this time, the control circuit 7 controls the character generator 15 to output character data such as "recorder screen" and also supplies a control signal to the switch 14 to turn on the switch 14. ..

Thus, the video signal from the reproduction system signal processing circuit 12 and the character signal from the character generator 15 are supplied to the adder circuit 16, and these are added in the adder circuit 16 to form an added signal. The signal is supplied to the television monitor 17.

Therefore, as shown in FIG. 5B, a reproduced image from the reproduction system signal processing circuit 12 is displayed on the screen of the television monitor 17, and a "recorder screen" indicating that the reproduced image is the reproduced image of this unit. Is displayed.

Further, the control circuit 7 obtains the count information of this machine, controls the character generator 15 based on this information, and outputs the numerical data according to the obtained count information.

Then, a control signal is supplied to the switch 14 to turn on the switch 14.

Thus, the character generator 15
Numerical character signal, which is the count value of this machine from
6, the reproduction video signal and the numerical character signal from this unit are added in this addition circuit 16, and this addition signal is supplied to the television monitor 17.

Therefore, as shown in FIG. 6B, the reproduced image of this unit is displayed on the screen of the television monitor 17, and the count information of this unit is displayed.

By doing so, it is possible to easily determine whether the other device 6 or the main device is currently controlled, and more accurate editing can be performed by the value of the counter.

At this time, the television monitor 17
While looking at the tube surface, the shuttle key 18g is used to set a desired recording position, and the frame key 18d is used to determine a desired recording start position, that is, an edit point in frame units.

It should be noted that the display indicating that the image is the image of this machine and the display of the counter of this machine may be performed simultaneously.

At step 150, the player key 18b
If it is "YES", the process proceeds to step 120 again, and if "NO", the process proceeds to step 160.

In step 160, the record key 18c
Is ON, and if "YES", step 1
If it is “NO”, the process proceeds to step 180.

At step 170, for example, the operation panel 1
It is determined whether or not the synchro edit key (not shown) of the operation key group 18a of No. 8 is turned on. If “YES”, the process proceeds to step 180, and if “NO”, the process ends.

In step 180, it is determined whether or not the start / pause key 18f is turned on. If "YES", the process proceeds to step 190, and if "NO", the process proceeds to step 170 again.

In step 190, editing is started, that is, reproduction of the other device 6 is started and recording of the present device is started. Then, the process proceeds to step 200.

In step 200, it is determined whether or not the start / pause key 18f is pressed. If "YES", the process proceeds to step 170 again.

When editing is started after pressing the synchro edit key, first, the pre-roll operation is performed.

This pre-roll operation is performed on the reproducing device side, that is,
The other machine 6 reverses from the determined edit point P, for example, at a normal reproduction speed for about 2 seconds, and performs variable speed reproduction, normal reproduction, or pause operation in the forward direction from this position to reach the edit point. That is.

In this figure, a is the pre-roll period, and the time information of this pre-roll period a is supplied from the other device 6 to this device in advance.

Accordingly, when the predetermined pre-roll period a has elapsed since the editing was started and the other machine 6 reproduces the edit point P, this machine starts recording according to the time information of the pre-roll period a supplied in advance. be able to.

As shown in FIG. 3, when the edit point is determined in the still state, that is, in the playback pause state, and the editing operation is actually started, the other device 6 first plays the data in the reverse direction at a minus double speed. When a predetermined period of time has passed, the other device 6 plays back at 1x speed in the forward direction, and when this unit enters the edit standby state, the other device 6 is temporarily suspended for the time adjustment, and thereafter, When the machine 6 enters the reproduction state and reaches the actual editing point, the machine starts recording.

This recording period b is a period in which the signal actually reproduced by the other device 6 is recorded on the magnetic tape 10 of this device.

As shown in this figure, the structure of the reproducing side, that is, the magnetic tape of the other device 6 is, for example, a pre-roll area for 2 seconds when traveling at a normal reproducing speed and a signal to be actually recorded. The recording area is recorded.

In this example, the above step 1
In 80, after the start / pause key 18f is pressed, after the pre-roll period a as described above, the reproduction signal of the other device 6 is actually recorded on the magnetic tape 10 of this device, that is, the pre-roll period a has passed. After that, since the recording of the apparatus is started, a display such as "standby for recording" is displayed on the screen of the television monitor 17, as shown in FIG.

As described above, in the pre-roll period a, the variable speed reproduction such as the reverse operation is performed in the other device 6, and the device starts the recording operation after the pre-roll period a has passed. This is one of the editing operations, and the above-mentioned "standby for recording" is displayed to indicate that the device is operating normally.

Therefore, the user does not mistake the operation of the device during the preroll period a for the device failure.

In this example, when a BS monitor key (not shown) of the operation button group 18a is pressed, a satellite broadcast image is displayed on the screen of the television monitor 17, and The satellite monitor sound is output from a speaker (not shown) of the television monitor 17, and the recorded video and audio signals are output to the output terminal as a line-out.

That is, when the BS monitor key of the operation button group 18a is pressed, the control signal from the control circuit 7 is supplied to the switch 13, and the movable contact 13d of the switch 13 is supplied.
Is connected to the fixed contact 13c, whereby the television monitor 17 is supplied with satellite broadcast video and audio signals, and the output terminal 13e is supplied with video and audio signals to be recorded.

The operation when the BS monitor key is pressed will be described below with reference to FIG.

First, in step 300, the operation key group 18
It is determined whether or not the reproduction key a (not shown) of "a" is turned on. If "YES", the process proceeds to step 310, and "N
If “O”, the process proceeds to step 320.

At step 310, it is judged whether or not a recording key (not shown) of the operation key group 18a is turned on,
If "YES", the process proceeds to step 330, "NO".
If so, the process proceeds to step 300 again.

At step 320, other processing is performed.

In step 330, it is judged whether or not the BS recording is performed, that is, whether or not the movable contact 5e of the switch 5 is connected to the fixed contact 5b by a selection operation, for example.
If S], the process proceeds to step 340, and if “NO”, the process proceeds to step 350.

In step 340, the movable contact 13d of the switch 13 is moved to the fixed contact 13b under the control of the control signal 7.
As a result, the television monitor 17 is supplied with satellite broadcast video and audio signals, and
Satellite output video and audio signals are supplied to the output terminal 13e.

The selection for recording is made by pressing, for example, a television key, a satellite broadcast key, or an external device key of the operation key group 18a.
Is performed by controlling the switch 5.

At step 350, it is judged whether or not the BS monitor key of the operation key group 18a is pressed, and "YE
If "S", the process proceeds to step 360, and if "NO", the process proceeds to step 370.

In step 360, the movable contact 13d of the switch 13 is moved to the fixed contact 13c under the control of the control circuit 7.
Thus, the television monitor 17 is supplied with the video and audio signals of the satellite broadcast and the video and audio signals of the television and the other device 6 recorded at the output terminal 13e. And it ends.

At step 370, the movable contact 13d of the switch 13 is moved to the fixed contact 13b under the control of the control signal 7.
As a result, the television monitor 17 is supplied with the video and audio signals from the television broadcast and the other device 6, and the same video and audio signals are also supplied to the output terminal 13e.

With this arrangement, while the video and audio signals of the television or the like are being recorded, the video and audio signals of the satellite broadcast can be enjoyed, and the output terminal 13e described above can be used.
If you connect another television monitor to, you can check the video and audio being recorded.

Further, another VTR is connected to the above-mentioned output terminal 13e.
When connected to, the video signal and the audio signal selected by the switch 5 can be recorded in this device, and the same signal can be recorded in another VTR connected to the output terminal 13e.

Also, the video and audio signals input to the switch 5 can be simultaneously recorded in this unit and another VTR.

As is apparent from the above, in this example,
In order to record the reproduction signal from the other device 6 in the present device, when the present device is set to the recording paused state, and when the other device 6 is set to the reproduction paused state, the present recording is temporarily stopped only by pressing the player key 18b. Since the state is set to the reproduction paused state, the edit point P of this machine can be confirmed without operating the shuttle key, and thus, the desired edit point P can be edited accurately.

In this example, the shuttle key 18g for editing is used to determine the rough editing point P, and the frame key 18d is used to finely determine the editing point. It is possible to edit well and improve operability.

The present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

[0115]

According to the present invention described above, when recording an input signal from the outside, when the recording is paused, the reproduction is paused by a predetermined operation. The editing point can be confirmed without operating the shuttle key, which has the advantage that the desired editing point can be edited accurately.

Further, according to the present invention described above, the control by the first operation button for performing variable speed reproduction and the second operation button for performing reproduction for each frame can be switched to this apparatus or another apparatus. Since this is done, there is an advantage that it is possible to edit with a desired editing point with high precision and to improve operability.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a magnetic recording / reproducing apparatus of the present invention.

FIG. 2 is a flowchart for explaining a magnetic recording / reproducing apparatus of the present invention.

FIG. 3 is an explanatory diagram for explaining a magnetic recording / reproducing apparatus of the present invention.

FIG. 4 is an explanatory diagram for explaining a magnetic recording / reproducing apparatus of the present invention.

FIG. 5 is an explanatory diagram for explaining a magnetic recording / reproducing apparatus of the present invention.

FIG. 6 is an explanatory diagram for explaining a magnetic recording / reproducing apparatus of the present invention.

FIG. 7 is a flowchart for explaining the magnetic recording / reproducing apparatus of the present invention.

[Explanation of symbols]

 7 Control Circuit 10 Magnetic Tape 18b Player Key 18c Record Key 18d Frame Key 18g Shuttle Key

Claims (2)

[Claims] 1. A magnetic recording / reproducing apparatus adapted to record a signal so as to form an inclined track on a magnetic recording medium or reproduce a signal recorded from the magnetic recording medium, when recording an input signal from the outside. The magnetic recording / reproducing apparatus is characterized in that when the recording is suspended, the reproduction is suspended by a predetermined operation. 2. A magnetic recording / reproducing apparatus adapted to record a signal so as to form an inclined track on a magnetic recording medium or reproduce a signal recorded from the magnetic recording medium, wherein a first variable speed reproduction is performed. And an operation button, a second operation button for reproducing each frame, and a switching means for switching control by the operation of the first and second operation buttons to the main unit or another unit. And a magnetic recording / reproducing apparatus.