JPH03116572A - Rotary head type recorder - Google Patents

Abstract

PURPOSE:To select an operation of the subject device during a period until recording is resumed after stopping recording in response to a using state of the device by providing a mode for stopping/starting carriage with a carrier means and a mode for starting recording with a recording means. CONSTITUTION:The subject device possesses a system controller 11 and an operating part 13, and is provided with the 1st mode for stopping/starting carriage with the carrier means and the 2nd mode for starting recording with the recording means. Consequently, when recording is desired to be stopped for a short period of time, the 1st mode is used so that the time for starting recording after stopping it can be made extremely short. Then, when recording is desired to be stopped over a long period of time, the 2nd mode is used so that the rotation of a rotary head 3, etc., can once be stopped. By this method, the operation of the device before starting recording after stopping it can be selected in response to the using state of the device, and hence the best operation can be performed in accordance with the using state of the device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary head type recording device, and particularly to a rotary head type recording device that records signals on a tape-shaped recording medium with a rotary head while conveying the medium.

[Prior art] This type of device is a video tape recorder (VTR).
However, in VTRs, for example, when recording images taken with a video camera, a so-called splicing function is generally employed to make the seams between cuts less noticeable on the playback screen. has been done. FIG. 5(a) is a diagram schematically showing the movement of the tape during the conventional continuous shooting. In this conventional method, first, when transitioning from a recording state (indicated by double lines in the figure) to a recording-stop (pause) state, the tape that has been stopped is rewound by a certain amount, and the pinch roller is pressed against the capstan. Leave it there and wait. After the record button is pressed, it is customary to enter the playback state for a predetermined period corresponding to the amount of rewinding, and then shift to the record state after performing tracking #I control.

By performing the splicing operation as described above, the tape is conveyed until recording starts while tracking the recorded tracks, so that disturbances in the tracking pattern at the seam can be reduced.

[Problems to be Solved by the Invention] However, such conventional splicing requires rewinding and playback time of the tape, which inevitably results in a time that cannot be recorded for at least 4 seconds or more. During this time, a problem occurred in which even if the video camera was capturing the video that the video camera wanted to record, it could not be recorded.

In addition, in the conventional method described above, when transitioning from the playback state to the recording state, a new recording track may be formed over the already recorded track in order to avoid creating an unrecorded part, and a part of the video that should have been recorded may be erased. There were also problems such as the data being deleted and being omitted when played back later.

In addition, in relation to the above-mentioned problems, the time interval of so-called interval recording, which repeats short-term recording at predetermined intervals, cannot be made shorter than a certain interval, and when recording is frequently paused and restarted. There were problems such as increased power consumption.

In this way, even when simply performing continuous shooting, there are cases where recording is not performed for a long period of time, and cases where recording is frequently paused and restarted, and with conventional devices, various problems arise especially in the latter case. Occur.

Against this background, the present invention makes it possible to appropriately select the operation of the apparatus during the period after stopping recording and before restarting recording according to the usage status of the apparatus, and to perform a suitable operation in each situation. The object of the present invention is to provide a rotary head type recording device.

[Means for Solving the Problems] For such purposes, the rotary head type recording device of the present invention includes a rotary head that traces a tape-shaped recording medium and records signals on the medium, and a rotary head that rotates the rotary head. The conveyance means includes a rotational drive means, a conveyance means for conveying the tape-shaped recording medium in its longitudinal direction, and a recording means for supplying a recording signal to the rotary head, and when recording by the recording means stops or starts, the conveyance means a first mode in which the conveyance is stopped and started by the recording means; and a first mode in which the conveyance direction by the conveyance means is reversed as recording by the recording means is stopped and the conveyance is stopped after a predetermined period, and a predetermined mode in which the conveyance by the conveyance means is started. and a second mode in which the recording means starts recording after a period of time.

[Function] With the above configuration, when it is desired to stop recording for a short period of time, by using the first mode, it is possible to extremely shorten the time from when recording is stopped until it is started. In addition, the conveying means does not carry out wasteful conveyance, which is advantageous in terms of power consumption. In addition, if you want to stop recording for a long period of time, you can use the second mode to temporarily stop the rotation of the rotary head. In this case, you can prevent damage to the recording medium and reduce consumption. It is also advantageous in terms of power.

[Example] Below, an example of the present invention will be explained. Fig. 2 shows the following:
1 is a block diagram showing a schematic configuration of a VTR as an embodiment of the present invention. FIG.

In the figure, 1 is a rotating drum, 2 is a drum rotation motor (DM), 3 is a recording/reproducing rotary head (RPH), and 4 is a rotary drum.
5 is a rotating erase head (FEH); 5 is a capstan for running the tape; 6 is a capstan motor (CM); 7 is a magnetic tape; 8 is a drum rotation speed detection signal (DFG) and a drum rotation phase detection signal (DPG). 9 is a capstan servo circuit that controls the capstan motor 6 according to a capstan rotation speed detection signal (CFG); 10 is a signal processing circuit that processes recording signals and reproduction signals; 11 is a system controller, 12 is an erasing circuit, 13 is an operation section for manually inputting keys to specify a mode of the system, and 14 is an ATF circuit for generating a tracking signal.

In the figure, the operation in the recording mode will be explained. After the tape 7 wound around the drum 1 at predetermined angular intervals is erased by the rotating erasing head 4 which traces the tape 7 in advance of the recording/reproducing head 3, the recording/reproducing head 3 receives the video from the terminal 15 supplied from the signal processing circuit IO. Recording signals including signals, audio signals, tracking pilot signals, etc. are recorded to sequentially form video tracks at regular intervals. During this time, the capstan 5 continues to transport the tape 7 at a constant speed.

In the drum servo circuit 8, the drum servo circuit 8 is controlled to rotate at a constant speed while maintaining a specific phase difference between the vertical synchronizing signal (VD) of the video signal to be recorded and the recording/reproducing head 3 attached to the drum 1. .

On the other hand, the operation in playback mode will be explained. Among the RF signals reproduced from the recording/reproducing head 3, the video signal,
The audio signal is output from the terminal 16 after being demodulated by the signal processing circuit IO. The aforementioned tracking pilot signal is supplied to the ATF circuit 14, and a tracking error signal is output from the ATF circuit 14.

This tracking error signal is guided to the capstan servo circuit 9 and used for tracking control operation by the capstan 5. During this time.

A drum servo circuit 8 rotates the drum 1 at a constant rotational speed. In each of the above-mentioned modes, each part of the system is controlled by a system controller 11 including a microcomputer in accordance with manual key instructions from an operation unit 13. In particular, the drum servo circuit 8 and capstan servo circuit 9 are controlled by a system controller 11 including a microcomputer. is the drum motor l,
In the 0th order, information such as rotation/stop of the capstan motor 6, rotation direction information, rotation speed information, rotation phase information, mode information such as recording mode/playback mode, etc. is closely exchanged with the system controller 11. The operation of the example VTR related to continuous shooting will be explained according to the flowchart shown in FIG.

When the power switch of the operation unit 13 is turned on (Sl),
Drum l is activated (S2) and enters recording Bose mode. When the trigger switch of the operation unit 13 is turned on in the recording Bose mode, the mode shifts to the recording mode.
In this embodiment, the operation upon transition to the recording mode differs depending on the mode transition up to the recording Bose mode. This mode transition is determined in S6.

First of all, if the trigger switch is turned on in the recording mode and the recording Bose mode is set, recording will start when the capstan is activated (sio), which will be explained in detail later.On the other hand, if you turn on the power switch or operate from stop mode Part 1
When the recording button 3 is turned on and the recording Bose mode is set, first, the capstan 5 is started, and tracking control by the ATF circuit 14 is started while playing back (S7), and then the predetermined period T has elapsed. Then (S8),
Disclose records.

When the trigger switch is turned on in recording mode (Sl
l), stop recording when the capstan stops (S
12) Return to recording Bose mode. In this case, when the trigger switch is turned on again, the process moves to S10. on the other hand,
Is the power switch turned off in recording mode (S13
) or when the stop key on the operation unit 13 is turned on, recording is stopped and the capstan is reversed (515).
, the tape is rewound 516) until a predetermined period of time has elapsed, the capstan is stopped 517), and the drum is also stopped (S l 8) to enter the stop mode. When the recording key is turned on in this stop mode (S20), the drum is restarted and the system returns to the recording Bose mode. In this case, when the trigger switch is turned on again, the process moves to S7.

If the power is turned off in the recording mode in S13, the drum is stopped in S1B, and then power off is confirmed in 319, and the process ends together with the case that the power is turned off in the stop mode. On the other hand, if the power is turned off in the recording pause state, the drum is stopped in S21 and the post-processing is ended.

Then, when the power is turned on again (Sl) and the trigger switch is turned on after entering the recording Bose mode, the process moves to S7.

As is clear from the above description, in the VTR of this embodiment, when resuming recording after stopping, it shifts from recording mode to recording Bose mode, and when shifting to recording mode again, the recording stop period is short. Therefore, recording can be resumed immediately without rewinding the tape (first mode). In addition, when performing stop mode or turning off the power switch, the tape is rewound, the rotation of the drum is stopped, and when recording is resumed, the tape is transported for a predetermined period in playback mode and tracking control is performed. A configuration was adopted in which recording is restarted (second mode).

Since the latter method is a well-known method as already explained, detailed explanation thereof will be omitted in this specification. The tape conveyance and mode transition at this time are schematically shown in FIG. 6(a).

The former method will be explained in detail below.

FIG. 3 is a timing chart showing the operation of the second section during continuous shooting according to the former method, and FIG. 6(b) schematically shows tape conveyance and mode changes.

In the timing chart of FIG. 3, (a) is the operation section 1.
3, (b) is a head switch pulse (H3P) for sequentially switching multiple recording/reproducing heads 3 to the rotation of drum 1, (C) is a timing signal for operating the rotating erase head 4, (d) ) is a timing signal that causes a recording current to flow through the recording/reproducing head 3 to switch between the recording mode and the reproduction mode, (e) is a control timing signal that turns on and off the rotation of the capstan 5, and (f) is a control timing signal for turning the rotation of the capstan 5 on and off.
(g) is a drum speed compensation timing signal for changing the rotational speed of the drum l for a predetermined period; (g) switches the value of the phase target value in phase control that controls the phase difference between the drum l and the vertical synchronization signal of the video signal to be recorded; This is the drum phase control offset signal.

One feature of this embodiment is that the recording timing signal (d) and the capstan rotation timing signal (e) are switched almost simultaneously in synchronization with H3P generated in response to drum rotation, and that the transition from the recording state to the pause state The transition timing from the pause state to the recording state is determined by H3.
The point is that the timing is set to be almost the same as that of P. During this time, the drum servo circuit 8 receives the vertical synchronization signal and the DP
Needless to say, the phase relationship with G is kept constant, and the capstan 5 and the pinch roller are held in a pressed state.

With such an operation, problems such as large unrecorded areas and discontinuity of video signals do not occur even at recording joints, waste time is extremely short, and good continuous shooting is possible.

Furthermore, if the rotational speed of drum l is constant when performing the above-mentioned continuous shooting, when transitioning from the pause state to the recording state,
Since the activation of the capstan 5 and the start of recording by the video head are almost simultaneous, the relative speed between the tape and the video head at this timing changes, so that a slight horizontal blur may occur on the screen at this point during playback. The details of the measures being taken are described below.

FIG. 4 is a diagram showing details of the drum servo system of the VTR shown in FIG. 2, and FIG. 5 is a timing chart when transitioning from a pause state to a recording state.

In FIG. 4, the symbol 8 within the dashed line corresponds to the drum servo circuit 8 in FIG. This is a drum control circuit that generates control signals for phase rotation. Further, 22 is a voltage pattern generation circuit that generates a control voltage pattern for accelerating and decelerating the drum l, which will be described later, 23 is a changeover switch, and 24 is a drum motor driver.

As mentioned above, if the rotational speed of the drum l is always constant, if the recording start timing and the capstan activation timing are made to match, the relative speed between the tape 7 and the recording/reproducing head 3 will increase as the rotational speed of the capstan accelerates. The state is faster than the normal recording state and gradually becomes slower until it becomes equal to the normal recording state. This is because the VTR of this embodiment assumes that the drum rotation direction and the tape running direction have vector components in the same direction. Therefore, in order to compensate for this, in accordance with the drum speed compensation timing signal shown in (f) in FIGS. 3 and 5, a predetermined deceleration and acceleration are performed as shown in the drum control signal (h) for a predetermined period before and after starting the capstan 5. Insert pulse voltage signals sequentially. This made it possible to cancel out the change in relative speed when starting the capstan. That is, the system controller 11 supplies the speed compensation timing signal (f) to the voltage pattern generation circuit 22 and the switch 23, switches the switch 23 to the H side for a predetermined period, and during this period the output of the voltage pattern generation circuit 22 is output from the motor driver 24. supply to.

Furthermore, in order to prevent the rotational phase of the drum l from shifting due to the speed compensation operation described above, the system controller 11 sets the rotational phase of the drum l in response to the vertical synchronization signal in a recording pause state to be different from that during normal recording. A drum phase control offset signal (g) is supplied to the drum control circuit 21 to set the phase. In this embodiment, as described above, it is assumed that the rotational direction of the recording/reproducing head 3 and the conveyance direction of the tape 1 during recording have vector components in the same direction.
The rotational speed of drum 1 is slowed down just before the capstan 5 is started, and is increased immediately after it is started.
The rotational phase of is delayed. Therefore, the drum control circuit 21
operates in accordance with the signal (g) so that the rotational phase of the drum 1 in the pause state is advanced from that during normal recording, and is controlled to maintain the original rotational phase after the start of recording.

By configuring as described above, it is possible to prevent the drum servo circuit 8 from becoming unstable due to the phase fluctuation of the drum l that occurs due to the relative speed compensation operation.

In the above example, the recording stop/start timing and the capstan stop/start timing are switched almost simultaneously, but the capstan stop L, start timing, and recording are changed in consideration of the actual transient response of the capstan. cessation of,
It is also possible to determine the relative relationship with the start timing. For example, if the capstan stop and start timing is set slightly earlier than the recording stop and start timing, better continuous shooting can be achieved.

As shown in the double series, in the VTR of this embodiment, if recording is stopped for a long time, a method is adopted that allows good continuous shooting even if the rotation of the drum is stopped. The drum can be stopped at the time of operation, which is advantageous in terms of power consumption. In addition, when stopping recording for a short time, there is no need to rewind the tape, which saves wasted time.The time from stopping to starting recording can be set short, and there is no waste in transporting the tape, which reduces power consumption. It's advantageous.

In the above embodiment, the drum servo circuit and capstan servo circuit are shown as separate circuits from the system controller, but in recent years, the above 3m
It is also possible to implement the present invention, and the introduction of the present invention is more effective when control is performed by such an L-chip microcomputer.

[Effects of the Invention] As explained above, according to the rotary head type recording device of the present invention, the operation of the device from the stop to the start of recording can be selected depending on the usage status of the device, so that the device can be operated easily. It can perform the best operation according to the usage situation.

[Brief explanation of drawings]

FIG. 1 is a flowchart for explaining the operation related to continuous shooting of the VTR of the present invention. FIG. 2 is a diagram showing a schematic configuration of a VTR as an embodiment of the present invention. Figure 3 is a timing chart to explain the operation of the numbered part in Figure 2. Figure 4 is a diagram showing details of the drum servo system of the VTR in Figure 2. Figure 5 is the transition from the pause state to the recording state. FIGS. 6(a) and 6(b) are timing charts for explaining the operation of the drum servo system at the time of recording. FIGS. 6(a) and 6(b) are diagrams schematically showing the movement of the tape during continuous shooting according to the present invention, respectively. In the figure, l is a drum, 2 is a drum motor, 3 is a recording/reproducing head, 4 is a rotary erasing head, 5 is a capstan, 6 is a capstan motor, 7 is a magnetic tape, 8 is a drum servo circuit, 9 is a capstan servo circuit, IO is a signal processing circuit, 11 is a system controller + roller, 12 is an erase circuit, 1
3 is an operating section, 14 is an ATF circuit, 21 is a drum control circuit, and 22 is a voltage pattern generation circuit.

Claims (3)

[Claims] (1) a rotary head that traces a tape-shaped recording medium and records signals on the medium; a rotary drive unit that rotates the rotary head; a conveyance unit that conveys the tape-shaped recording medium in its longitudinal direction; recording means for supplying a recording signal to the rotating head, the recording means can stop and stop recording;
A first mode in which the conveyance by the conveyance means is stopped and started upon the start of recording, and a first mode in which the conveyance direction by the conveyance means is reversed upon stopping recording by the recording means and the conveyance is stopped after a predetermined period, and the conveyance is stopped after a predetermined period. and a second mode in which the recording means starts recording after a predetermined period of time after the start of conveyance by the rotary head type recording apparatus. (2) In claim (1), in the first mode, the recording by the recording means and the conveyance by the conveying means are stopped in response to the rotary head reaching a predetermined phase. A rotary head type recording apparatus characterized in that the recording by the recording means and the conveyance by the conveying means are started in response to the rotary head reaching the predetermined phase. (3) In claim (1), the rotary head type recording is characterized in that in the second mode, tracking control is performed for a period from the start of conveyance by the conveyance means to the start of recording by the recording means. Device.