JPH0554471A - System for consecutive recording in magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To provide a consecutive recording system in a magnetic recording and reproducing device capable of smooth consecutive recording from a preceding video signal to a new video signal even when a interrupting signal is not detected at the time of consecutive recording. CONSTITUTION:When a recording action is temporarily interrupted, the interrupting signal is recorded in the control track of a magnetic tape 8, and simultaneously, the recording action is temporarily interrupted after proceeding with recording of the video signal only during a fixed time. Then, at the time of rezuming of the recording action, when the interrupting signal recorded in the magnetic tape 8 is not detected, the recording action is forcedly resumed after passing a detecting expected time of the interrupting signal and before passing a fixed time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous recording system for a magnetic recording / reproducing apparatus, and is used, for example, in a video tape recorder.

[0002]

2. Description of the Related Art FIG. 2 is a schematic plan view for explaining the movement of the mechanism shown in FIG. 2 and a schematic diagram for explaining the recording state of a magnetic tape in a continuous recording system using a conventional video tape recorder. It will be described with reference to FIG. However,
In FIG. 3, the recorded portion of the video signal recorded before the continuous recording state is shown by a diagonal line descending to the left, the recorded portion of the video signal recorded after the recording is resumed is shown by a diagonal line descending to the right, and an unrecorded portion is shown. Shown as blank.

In FIG. 2, between the tape supply side of the tape cassette 1 and the input side of the rotary drum 2, a tension arm 4, a full width erasing head 5, a supply side guide roller 6,
An inclined pole 7 is provided at each position, and between the tape winding side of the tape cassette 1 and the output side of the rotary drum 2, an inclined pole 9, a winding side guide roller 10, and A are provided.
A / C (audio / control) head 11, a capstan 12, and a pinch roller 13 are provided at their respective positions.

At the time of tape loading, the magnetic tape 8 pulled out from the supply reel 1a of the tape cassette 1 is first tensioned by the tension arm 4 and comes into contact with the full width erasing head 5, and then with the supply side guide roller 6. It is wound around the rotary drum 2 while being guided by the inclined pole 7, and then guided by the inclined pole 9 and the winding side guide roller 10 to contact the A / C head 11, and the pinch roller 13 and the capstan 12 rotate. It is taken up by and taken up by the take-up reel 1b.

At this time, the take-up reel 1b is driven by a capstan motor (not shown) for driving the capstan 12 in the take-up direction via an idler gear (not shown). Further, the magnetic tape 8 is attached to the capstan 12 rotating clockwise in the drawing on the pinch roller 1
By being pressed by 3, it is advancing at a predetermined speed in the arrow X direction in the drawing. Further, in the A / C head 11,
Audio signals and control signals are recorded.

In the video tape recorder having the above structure, when the continuous recording state is reached, an interruption signal is recorded on the control track of the magnetic tape 8 by the A / C head 11, and at the same time, the recording / reproducing head (provided on the rotating drum 2 ( The recording of the video signal on the magnetic tape 8 and the progress of the magnetic tape 8 are stopped (not shown). The recording state of the magnetic tape 8 at this time is shown as a state in FIG.

Next, the capstan 1 of the pinch roller 13
The pressure contact with 2 is released, and then the capstan motor slightly rotates counterclockwise in the drawing to switch the idler gear on the take-up reel 1b side to the supply reel 1a side. After that, the pinch roller 13 comes into pressure contact with the capstan 12 again. The recording state of the magnetic tape 8 at this time is shown in FIG.
B state (this state is the same as the a state).

In the state b, the capstan 12 rotates counterclockwise in the figure at a speed of 1 × for about 1.8 seconds, for example.
As a result, the magnetic tape 8 moves about 60 mm in the reverse direction (that is, the arrow Y direction in the drawing) in the NTSC SP mode. The recording state of the magnetic tape 8 at this time is shown in FIG.
Show as state.

After that, the pressure contact of the pinch roller 13 to the capstan 12 is released, and then the capstan motor slightly rotates clockwise in the figure, and the idler gear on the supply reel 1a side is rewound on the winding side. Switch to the reel 1b side. After that, the pinch roller 13 comes into pressure contact with the capstan 12 again. The recording state of the magnetic tape 8 at this time is shown in FIG. 3 as the d state (this state is the same as the c state).

As described above, the magnetic tape 8 shifts from the a state-b state-c state to the d state,
The standby state of the continuous recording is completed, and then the instruction to restart recording is awaited.

When a recording restart instruction is received, the capstan 1
2 starts rotating clockwise in the drawing, and the magnetic tape 8 starts moving in the X direction in the drawing, but the mode at this time is not the recording mode but the reproduction mode. Then, in this reproducing mode, when the interruption signal recorded on the control track by the A / C head 11 is detected (the recording state of the magnetic tape 8 at this time is shown as the state e in FIG. 3), the video tape recorder is in the reproducing mode. To the recording mode, and recording is started from this point. The recording state of the magnetic tape 8 at this time is shown as state f in FIG.

As described above, in the conventional video tape recorder, during the continuous recording, the continuous recording is performed by detecting the interruption signal recorded on the control track of the magnetic tape 8.

Therefore, if the interruption signal is not detected, the recording is not restarted at any time, and the continuous recording is not performed.

Therefore, in the conventional video tape recorder, when the interruption signal is not detected, a predetermined time T
The recording is forcibly restarted after eleven. The recording state of the magnetic tape 8 at this time is shown in FIG.

[0015]

As described above, in the conventional video tape recorder, when the interruption signal is not detected, the recording is forcibly restarted after the lapse of the predetermined time T11 to perform the continuous recording. During the predetermined time T11, a non-recorded portion in which a video signal is not recorded occurs on the magnetic tape 8. When the magnetic tape 8 having such a non-recorded portion is reproduced, this non-recorded portion becomes a noise section, and the reproduction screen is displayed. There is a problem that it is uncomfortable for the user who is looking at.

The present invention has been made in view of the above circumstances, and an object thereof is to enable smooth continuous recording from a previous video signal to a new video signal even when an interruption signal is not detected during continuous recording. Another object of the present invention is to provide a continuous recording method for the magnetic recording / reproducing apparatus.

[0017]

In order to solve the above problems, the magnetic recording / reproducing apparatus continuous recording method according to the present invention is
When the recording operation is temporarily interrupted, the interruption signal is recorded on the recording medium, and then the recording operation is temporarily interrupted after the video signal is continuously recorded for a certain time, and the recording operation is resumed. After the interruption signal recorded on the medium is detected, or when the interruption signal cannot be detected, the recording operation is restarted after the scheduled detection time of the interruption signal and before the elapse of the predetermined time. ..

[0018]

When the recording operation is temporarily interrupted, the interruption signal is recorded in the recording medium, and thereafter the recording operation is temporarily interrupted after the recording of the video signal is continued for a predetermined time. That is, the video signal for a certain period of time is recorded on the recording medium from the recording position of the interruption signal.

On the other hand, when the recording operation is restarted in this state, when the interruption signal recorded on the recording medium is detected, the recording operation is restarted after the detection. As a result, the video signal after the recording and reproduction is recorded in series from the video signal before the continuous recording.

When the interruption signal cannot be detected when the recording operation is reproduced, the recording operation is forcibly restarted after the scheduled time for detecting the interruption signal and before the elapse of the predetermined time. As a result, when the recording operation is restarted,
Since the video signal before the continuous recording is recorded, the video signal before the continuous recording is also recorded in sequence in this case as well.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing a recording state of a magnetic tape recorded by a continuous recording method of a magnetic recording / reproducing apparatus according to the present invention. However, in the figure, the recording part of the video signal recorded before the continuous recording state is shown by a diagonal line descending to the left, the recording part of the video signal for a fixed time after the continuous recording state is shown by a horizontal line, and after the recording is restarted. The recorded portion of the recorded video signal is indicated by a diagonal line descending to the right, and the unrecorded portion is indicated by a blank.

The mechanism is the same as that of the conventional video tape collator shown in FIG. That is, at the time of tape loading, the supply reel 1a of the tape cassette 1
The magnetic tape 8 extracted from the first is first tensioned by the tension arm 4, and the full width erasing head 5
, And is wound around the rotary drum 2 by being guided by the supply-side guide roller 6 and the inclined pole 7, and then guided by the inclined pole 9 and the winding-side guide roller 10 to be A / C.
The head 11 is brought into contact with the head 11, is taken up by the rotation of the pinch roller 13 and the capstan 12, and is taken up by the take-up reel 1b.

At this time, the take-up reel 1b is driven in the take-up direction via an idler gear (not shown) by a capstan motor (not shown) that drives the capstan 12. Further, the magnetic tape 8 is attached to the capstan 12 rotating clockwise in the drawing on the pinch roller 1
By being pressed by 3, it is advancing at a predetermined speed in the arrow X direction in the drawing. Further, in the A / C head 11,
Audio signals and control signals are recorded.

Next, the operation of the video tape recorder having the above-mentioned structure when the continuous recording state is set will be described with reference to the schematic diagram showing the recording state of the magnetic tape shown in FIG.

In the continuous recording state, the A / C head 11
An interruption signal is recorded on the control track of the magnetic tape 8 by the magnetic tape 8 and then a predetermined time T1 (for example, 0.6 se
c: This is about 20 mm in the SP mode of the NTSC system) and the video signal is continuously recorded. After this, recording of the video signal on the magnetic tape 8 and the magnetic tape 8
Stop progress. The recording state of the magnetic tape 8 at this time is shown as state a in FIG.

Next, the capstan 1 of the pinch roller 13
The pressure contact with 2 is released, and then the capstan motor slightly rotates counterclockwise in the drawing to switch the idler gear on the take-up reel 1b side to the supply reel 1a side. After that, the pinch roller 13 comes into pressure contact with the capstan 12 again. The recording state of the magnetic tape 8 at this time is shown in FIG.
B state (this state is the same as the a state).

In this state b, the capstan 12 rotates counterclockwise in the figure at a speed of 1 × for a predetermined time T2 (for example, about 2.4 seconds). As a result, the magnetic tape 8 is
Approximately 80mm in the reverse direction (that is,
Move in the direction of the arrow Y in the figure). Magnetic tape 8 at this time
The recording state of is shown in FIG. 1 as state c.

After that, the pressure contact of the pinch roller 13 to the capstan 12 is released, after which the capstan motor slightly rotates clockwise in the figure, and the idler gear on the supply reel 1a side is rewound on the winding side again. Switch to the reel 1b side. After that, the pinch roller 13 comes into pressure contact with the capstan 12 again. The recording state of the magnetic tape 8 at this time is shown in FIG. 1 as the d state (this state is the same as the c state).

As described above, the magnetic tape 8 shifts from the a state-b state-c state to the d state,
The standby state of the continuous recording is completed, and then the instruction to restart recording is awaited.

When a recording restart instruction is received, the capstan 1
2 starts rotating clockwise in the drawing, and the magnetic tape 8 starts moving in the X direction in the drawing, but the mode at this time is not the recording mode but the reproduction mode. Then, in this playback mode, after about 1.8 seconds [that is, T2
(2.4 seconds) -T1 (0.6 seconds)] to A / C head 11
When the interruption signal recorded on the control track is detected by (the recording state of the magnetic tape 8 at this time is shown in FIG.
The video tape recorder switches from the reproduction mode to the recording mode, and recording is started from this point. The recording state of the magnetic tape 8 at this time is shown in FIG.
Is shown as f state.

On the other hand, in the reproducing mode, when the interruption signal recorded on the control track by the A / C head 11 is not detected after about 1.8 seconds, the video tape recorder issues a predetermined time T3 (however, from the instruction to resume recording). , T2−T1 ≦ T3 ≦ T2), and then the recording is forcibly restarted. Magnetic tape 8 at this time
The recording state of No. 1 is shown in FIG.

That is, according to the continuous recording method of the present invention, even when the interruption signal is not detected, there is a recording portion (a portion indicated by a horizontal line in the figure) of the video signal before the continuous recording after the interruption signal. In addition, the unrecorded part does not occur.

[0034]

According to the continuous recording method of the magnetic recording / reproducing apparatus of the present invention, when the recording operation is temporarily interrupted, the interruption signal is recorded on the recording medium, and thereafter the recording of the video signal is continued for a predetermined time. Then, when the recording operation is temporarily interrupted and the recording operation is restarted, after the interruption signal recorded on the recording medium is detected, or when the interruption signal cannot be detected, it is after the scheduled detection time of the interruption signal has elapsed. Since the recording operation is restarted before the elapse of the predetermined time, even if the interruption signal is not detected when the recording operation is restarted, there must be a recording portion of the video signal before the continuous recording after the interruption signal. Therefore, it is possible to prevent the occurrence of an unrecorded portion. Therefore, there is no unpleasant noise due to an unrecorded portion during reproduction, and an excellent reproduced image can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a recording state of a magnetic tape recorded by a continuous recording method of a magnetic recording / reproducing apparatus according to the present invention.

FIG. 2 is a schematic plan view for explaining the movement of the mechanism.

FIG. 3 is a schematic diagram showing a recording state of a magnetic tape recorded by a continuous recording method of a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

 1 tape cassette 2 rotating drum 8 magnetic tape 11 A / C head 12 capstan

Claims (1)

[Claims] 1. When the recording operation is temporarily interrupted, an interruption signal is recorded on a recording medium, and after that, the recording of the video signal is continued for a certain time, and then the recording operation is temporarily interrupted. When restarting, after restarting the recording operation after detecting the interrupt signal recorded in the recording medium, or when the interrupt signal cannot be detected, after the scheduled time for detecting the interrupt signal has elapsed and before the elapse of the predetermined time. A continuous recording method for a magnetic recording / reproducing device.