JPS60163260A - Composite recording device of video tape recorder - Google Patents

Abstract

PURPOSE:To attain rapid and sure composite recording in a VTR by continuing the prescribed volume of recording at the time of temporary stop operation of recording to record a control signal by a fixed head, and using said recorded signal to a tracking servo at the composite recording time. CONSTITUTION:When temporary stop operation for the VTR under recording state is executed, the VTR is not immediately stopped by a system controller 11, the recording state is continued for a fixed period, and after recording a control signal through a control signal servo circuit 12 in a tape by a fixed control head 15, the VTR is made temporary stop state. As compared to the case using only a pilot signal, winding for a short period is executed and then the temporary stop state is attained. At the start of reproducing, a video is muted by the reproduced output of said control signal through the circuit 12 and a controller 11, a pilot signal servo circuit 13 is disabled and tracking servo for a rotary head is executed by the reproduced control signal. Then, a recording is restarted and rapid and precise composite recording is attained by the control signal for a short period.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a continuous shooting device for a video tape recorder.

[Technical background of the invention]

When recording a video signal following the previous video signal at time intervals on a general helical scan video tape recorder (hereinafter referred to as a VTR), so-called continuous shooting, the control signals before and after the continuous shooting are recorded. Phase continuity must be maintained. If the phase continuity of this control signal is not maintained, color bleeding or the like will occur on the screen at this portion during playback. Therefore, when recording continuously, if a recording pause operation is performed during recording,
When the capstan motor is reversed and the tape is rewound a small amount to cancel the recording pause, the VTR is placed in playback mode and the previously recorded control signal is played back, and this playback control signal and vertical synchronization signal are The method used is to match the phase with the frequency-divided signal and apply tracking servo to the rotary head, and then resume recording.

FIG. 1 shows a timing chart for this conventional continuous shooting. FIG. 4(a) shows a recording mode signal.

The H level represents the recording mode. FIG. 6(b) shows a capstan reverse signal, where H level indicates reverse mode. Figure (C) shows the pinch roller control signal, H
The level indicates the pinch roller's pressure on the capstan (ie, tape run). The continuous shooting operation will be explained based on this timing chart. When a recording pause operation is performed at time t, the capstan is reversed for one hour T8 and the tape is rewound. When the recording pause is canceled after 1 hour T has elapsed (time "t"), the playback mode is activated for TsO time. At this time, a control signal is played back, and the rotating head is controlled based on this control signal. Tracking servo is performed.

Then, after the servo is taken (time ts), recording is restarted. The times T, , T, are almost the same, and enough time is secured for the servo to lock during playback after the recording pause is released. This time is the count value of the control signal or the capstan FG.
Controlled by the signal count value.

[Problems with background technology]

By the way, it has been proposed to supply a pilot signal to the rotary head during recording, and perform tracking servo of the rotary head based on this reproduced pilot signal during reproduction (Japanese Patent Application Laid-Open No. 116120/1984, etc.). In such a case, it takes longer to achieve servo lock than when servo is performed using a control signal. For this reason, in the splice shooting υ method where the tape is rewound once and the recording pause is released, the recording pause is canceled and the servo is taken. needs to be made larger. That is, there is a drawback that quick continuous shooting cannot be performed in this case.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a continuous shooting device for a video tape recorder that can perform rapid continuous shooting.

[Summary of the invention]

The present invention provides a continuous recording device for a video tape recorder having servo means for supplying a pilot signal to a rotary head together with a video signal during recording and for performing tracking servo of the rotary head based on a reproduction pilot signal during reproduction. A fixed head that records a control signal on the recording head and then reproduces the control signal, a servo means that performs tracking servo of the rotary head based on the reproduction control signal, and a servo means that further records the control signal at F9 when a recording pause operation is performed. A means for continuing recording and recording a control signal on the tape by a fixed head at least during this time, and then stopping recording and rewinding the tape by a predetermined amount, and when an operation for canceling the recording pause is performed;
Once in play mode.

In this playback mode, the tracking servo of the rotary head is stopped by a tracking servo means based on a playback control signal, and recording is restarted after 1,000 seconds.

Note that in this specification, (recording and rewinding) a predetermined amount
shall mean the companion of length and time.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram of one embodiment of the present invention.

(111 is the system controller, α is the control signal servo circuit, (13) is the pilot signal servo circuit, (14) is the switch, and α is the control head.

(le+, α force is a rotating magnetic head. Also, (2
C2a is the wiring playback switching signal line, C2a is the capstan reverse signal line, (c) is the pinch lever crimping signal line, (2) is the video mute signal line, (to) is the control signal for recording and playing. This is the control circuit operation signal line which is a signal line. (c) is the operation switching signal line for switching the tracking servo based on the control signal to the tracking servo based on the pilot signal. This is the operation signal for the pilot signal servo circuit Q3). It becomes a line. C27), w is the signal line of the control signal,
(21 is a switching signal line of switch I, (to) is an input/output terminal for a video signal, and Gυ is a signal line for a pilot signal.

Next, the operation of the apparatus shown in FIG. 2 will be explained with reference to the time chart shown in FIG.

Assume that the VTR is now in recording mode. When the recording pause operation is performed at time '+1, the system controller 0
υ does not stop recording immediately, but continues recording a certain amount.

Note that when the VTR is in recording mode, the rotary head (11
(17) includes a pilot signal (during playback,
This pilot signal is used to perform tracking). When the above-mentioned slight amount of recording continues, the controller αυ sends a control circuit operation signal (see Fig. 3 (a)) to the servo circuit Q2 via the signal line (c).
The servo circuit a4 supplies a control signal to the control head (151 (see FIG. 3)). Then, the recording operation is stopped at time tim,
The running of the tape is also stopped. At this time, the output level of the recording/reproduction switching signal line eυ becomes L level (see FIG. 3(C)). In this way, after the recording pause operation, a certain amount of recording is continued, and at the same time, a control signal is recorded on the side edge of the tape. Note that the continuation of recording for a certain amount after the recording pause operation is continued for a sufficient amount of time (amount) for the servo circuit α4 to be servo-locked when the control pulses recorded during this period are reproduced for reasons described later. There is a need. In practice, 15 to 20 pulses are sufficient.

At time 'n, a capstan reverse signal is sent from the system controller aυ (see FIG. 3(d)).

The tape is rewound. At this time, the recording/reproducing switching signal on the signal line Qυ is at L level, so the VTR is in the reproducing mode. The previously recorded control signal is then played back from the control head α (
(see Figure 3(e)), this signal is further transmitted to the servo circuit (1
2 and is sent to the controller aυ via the signal line (c). The controller (11) detects this reproduction control signal and reads the pilot signal.

Next, when the recording pause is canceled at time tIs, the controller (11) sets the recording/reproduction switching signal to the reproduction mode (L level) (see FIG. 3(C)).

This is sent to the servo circuit (1) via the signal line (2υ).

Reproduction is thereby performed. At this time, the playback control signal (L'9!
D is obtained (see Fig. 3(e)), and this is the controller a.
It is sent to υ via the signal line (c). In response to this, the system controller θ1) sends an operating signal to the control signal servo circuit α2 via the signal line (c) (Fig. 3(a)).
). Then, tracking servo is performed using an external control signal (see FIG. 3(e)). Furthermore, the reproduction time TI is controlled to be approximately equal to the rewinding time Tll. At this time, an L level signal (see FIG. 3(f)) is sent from the servo circuit (14) to the servo circuit (13) via the signal line (e).

The servo circuit (I3) is made inoperative. Playing time TI! When the video mute signal line C2
When the signal level of 4) becomes L (see FIG. 3(g)), recording is restarted. That is, a rotating magnetic head (LE9.
(17) is input with a recording video signal from the terminal (to),
This is supplied to heads α and αη and recorded on a tape (not shown).

Furthermore, after a certain period of time has elapsed (time t14) + controller-y (lυ is the operating signal level of the control signal servo circuit 0 as L, see Figure 3 (a)), this servo circuit α is sent a signal to the servo circuit α mark. An operating signal (H level) (see Figure 3) is supplied via the line (26).

Then, the control of the tracking servo is switched from the control signal to the pilot signal.

At this point, the recording of the control signal (since the servo based on the control signal is performed for a certain period of time after resuming recording, the recording of the control signal is performed during this period) is stopped. As described above, recording of control signals is limited to only the joints in this case.

However, it goes without saying that the control signal may continue to be recorded.

In addition, if the playback control signal is not input when performing splice shooting (when trying to splice or record after a control head failure or playback state), the amount of tape rewind during splice shooting is determined by the pilot signal. If you make it shorter than usual, avoid using the same method. Furthermore, at this time, the servo signal is not switched from the pilot signal to the control signal.

In other words, the switch Q41 is normally ON (closed), but when the capstan is reversed to rewind the tape during continuous shooting, the playback control signal is transmitted through the signal line (to). If the signal is not input to the controller aυ within a predetermined time, the controller sends out a switching signal for the switch I via the signal line.
Turn OFF (open). In this case, the pilot signal servo circuit (13) comes into operation. With this configuration, when the control signal is not reproduced due to the head being clogged or the control signal not being recorded, the pilot signal servo circuit (13) is automatically activated. A servo circuit is activated by a signal.

Furthermore, the continuous shooting point (recording restart position, that is, the third
Time t8 in the figure. ) (In the above example, the rewind amount and playback amount are almost the same, so accurate splicing is not possible), the capstan motor, the number of rotational pulses of the reel, and the number of PG pulses are used. Various methods have been proposed in which the timing of rewinding and resuming recording is controlled using this method, and this embodiment may be combined with this method. Alternatively, the above control may be performed by counting the number of reproduction control pulses.

Furthermore, a method of tracking using four types of pilot signals of different frequencies in continuous shooting has been considered, but in this case, it is necessary to record the signals in sequence υ. In the case of this embodiment, even if the servo is applied by the control signal, the head αL (
By detecting the frequency of the reproduced pilot signal reproduced from lη and input to the servo circuit α via the signal line Gυ, the frequency of the pilot signal at the time of restarting recording can be specified. There are no problems with this point.

〔Effect of the invention〕

As described above, according to the present invention, in a VTR having a function of performing tracking servo based on a pilot signal, rapid continuous shooting can be performed by performing tracking using a control signal during continuous shooting. .

[Brief explanation of the drawing]

Figure 1 is a timing chart for conventional continuous shooting;
The figure is a block diagram of essential parts showing an embodiment of the continuous photographing device according to the present invention), and FIG. 3 is a timing chart of the device shown in FIG. 2. 11...System controller. 12...Control signal servo circuit. 13...Pilot signal servo circuit. 15...Control head. Agent Patent attorney Noriyuki Chika (and 1 other person) Figure 1 t+ b b Figure 2 Figure 3 t++ h2j13te4

Claims (1)

[Claims] A control signal is recorded on a tape in a video tape recorder continuous shooting device having servo means for supplying a pilot signal together with a video signal to a rotating head during recording and performing tracking servo of the rotating head based on the reproduced pilot signal during playback. In addition, there is a fixed head that reproduces the υ control signal, a servo means that performs tracking servo of the rotating head based on the reproduction control signal, and a servo means that further records a predetermined amount when a recording pause operation is performed. and at least during this period, the fixed head records a control signal on the tape, and then stops the recording and rewinds the tape by a predetermined amount;
When a recording pause canceling operation is performed, the recording mode is temporarily set to a playback mode, and in this playback mode, the tracking servo means turns off the tracking servo of the multi-rotation head based on a playback control signal, and then recording is restarted. A video tape recorder longevity photographing device characterized by the following features.