JP2630655B2 - Video magnetic recording device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic image recording apparatus, and more particularly, to a so-called time-lapse shooting used in animation shooting and the like.
The present invention relates to an image magnetic recording device capable of intermittently recording an image.

[Prior Art] FIG. 4 shows an example of a conventional magnetic recording apparatus. The magnetic recording apparatus 1 includes a head drum 3 having a head 28, a take-up reel 4 for winding the magnetic tape 2 during recording or reproduction, and a supply reel 5 for supplying the magnetic tape 2. A magnetic tape 2 having both ends wound around a take-up reel 4 and a supply reel 5 is wound around the head drum 3 in an oblique direction by a tape guide (not shown).

The magnetic recording device 1 is further provided with a recording control device 14 connected to the head drum 3 and for outputting a signal to be recorded on the head 28, separated from the magnetic tape 2 by a predetermined distance. A capstan 7 and a pinch roller 6 for running at a speed, and a capstan 7
, And a capstan driving device 11 for controlling the capstan motor 8.

The conventional magnetic recording apparatus 1 is additionally provided with a magnetic tape 2
Running control signal (hereinafter referred to as CTL signal) recording track 2
a CTL signal head 9 for recording a CTL signal in b, a CTL signal input / output switching device 12 connected to the CTL signal head 9 and switching a signal path in accordance with a recording / reproducing operation of the CTL signal head 9; A head switching detection head 10 for detecting a recording head among the heads 28; a head switching signal detection device 13 connected to the head switching detection head 10 for detecting a head switching signal;
11, CTL signal input / output switching device 12, head switching signal detection device 13, intermittent recording control means 26 connected to recording control device 14.
And

The intermittent recording control means 26 includes a tape rewinding means 15 for rewinding the magnetic tape 2 by a predetermined length between continuous intermittent recordings so as to enable a so-called splicing photographing to be performed in intermittent recording of a video. , CTL signal input / output switching device 1
2, a phase control means 16 for controlling the capstan driving device 11 in synchronization with the reproduced CTL signal to adjust the traveling speed of the magnetic tape 2,
The CTL signal is recorded on video signal recording track 2 of the magnetic tape.
a, connected to the intermittent recording means 17 for recording on the CTL signal recording track 2b, the phase control means 16 and the intermittent recording means 17, for recording the video and for controlling the phase.
And a CTL signal switching control means 30 for switching the CTL signal input / output switching device 12 in accordance with the switching between the CTL signal and the reproduction.

The intermittent recording control means 26 is further connected to the tape rewinding means 15 and includes a tape rewinding amount counter 18 for counting the amount of rewinding of the magnetic tape 2, and a phase control means.
16, a tape feed amount counter 20 for counting the tape feed amount during phase control, and a recording frame number counter 19 connected to the intermittent recording means 17 for counting the number of recording frames during intermittent recording. including.

Next, the operation of the conventional magnetic video recording apparatus will be described with reference to FIG. An intermittent recording control command is issued by an operator using input means (not shown).
Is input to The intermittent recording means 17 is a capstan driving device
By operating 11, the running of the magnetic tape 2 by the capstan motor 8 starts. The intermittent recording means 17 sends a CTL signal recording switching signal to the CTL signal switching control means 30. By the CTL signal switching control means 30, the CTL signal input / output switching device 12 switches so as to connect the intermittent recording means 17 and the CTL signal head 9.

Phase control means only for the first intermittent recording
The tape running speed is not adjusted by the intermittent recording means 16, the intermittent recording means 17 supplies the video signal to the video signal recording track 2 a via the head 28, and the CTL signal to the CT signal via the CTL signal head 9.
It is recorded on each of the L signal recording tracks 2b. After the recording of the video signal for a predetermined time (for example, 1 second; hereinafter, the time in parentheses indicates the time in an example of the operation), the tape rewinding unit 15 performs the predetermined time (1 second).
Is rewound. The rewind amount is set in advance by a tape rewind amount counter 18.

Next, when the intermittent control means is inputted to the intermittent recording control means 26, the phase control means 16 is operated to control the capstan driving device 11 so that the magnetic tape 2 runs.
The phase control means 16 sends the CTL signal
Sends a signal reproduction switching signal. CTL signal switching control means 30 is CTL
CTL signal input / output switching device 12 in response to a signal reproduction switching signal
Is switched to the phase control means 16 side.

The CTL signal is recorded on the magnetic tape 2 at the time of the previous intermittent recording. The CTL signal head 9 reproduces the CTL signal recorded on the track 2b, and outputs a CTL signal input / output switching device 12
Is input to the phase control means 16 via. Further, the head switching signal is input to the phase control means 16 by the head switching signal detecting device 13. In response to the reproduced CTL signal, the phase control means 16 causes the magnetic tape 2 to run at a constant speed in synchronization with the CTL signal.

In order to perform intermittent recording for a fixed number of frames (for example, 60 frames), the number of frames is set in the recording frame number counter 19. When it is detected from the count value of the tape feed amount counter 20 that the reproduction of the CTL signal of the predetermined length has been completed, the CTL signal switching control means 30 switches the CTL signal input / output switching device 12 to the intermittent recording means 17 side. Switch to. Intermittent recording means
17, the video signal for 60 frames is recorded on the video signal recording track 2a of the magnetic tape 2, and the CTL signal recording track 2b
The CTL signal is recorded in the.

Thereafter, control is transferred to the tape rewinding means 15, in which the magnetic tape 2 is rewound by a predetermined amount in order to make the magnetic tape 2 run at a constant speed by the next phase control means 16, and the apparatus is temporarily stopped. The tape rewind amount is set by the tape rewind amount counter 18 as described above.

The above-described series of operations is performed each time the intermittent recording control command is input. As a result, video signals formed by intermittent recording for a fixed number of frames (for example, 60 frames) are recorded on the magnetic tape 2.

FIG. 5 is a flowchart of a program of the controller when the intermittent recording control means 26 is realized by the controller. FIGS. 6A to 6K are schematic diagrams showing recording of video signals and CTL signals on the magnetic tape 2 based on this flowchart.

Referring to FIG. 5, this program starts operation when intermittent recording is designated by the operator,
Initial setting is performed in S101. The appearance of the tape at this point is shown in FIG. 6A. In FIGS. 6A to 6K, arrows 9a and 28a indicate the positions of the CTL signal head 9 and the head 28, respectively.
Indicates a fixed point on the magnetic tape 2 located at a location corresponding to.

Subsequently, in step S102, the recording of the video signal 61 by the head 28 and the recording of the CTL signal 62 by the CTL signal head 9 are performed simultaneously, for example, for one second. In step S103, the magnetic tape 2 is rewound by a length corresponding to the recording performed in step S102, that is, by a length corresponding to one second of the tape length. This is shown in FIG. 6C. In this state, the video magnetic recording apparatus is stopped until a next intermittent recording command is input.

In step S104, it is determined whether an intermittent recording command has been input. The process waits until this condition is satisfied. If the condition is satisfied, the control proceeds to step S105. In step S105, the CTL signal is reproduced,
The magnetic tape 2 runs at a constant speed for one second by the phase control means 16. After this constant speed running, the magnetic tape 2 is in the state shown in FIG. 6D.

Subsequently, the control proceeds to step S106, where the recording of the video signal 63 by the head 28 and the CTL signal by the CTL signal head 9 are performed.
64 recordings are made simultaneously for 2 seconds. As a result, the recording state on the magnetic tape 2 is as shown in FIG. 6E.
Further, the control proceeds to step S107, where the tape rewinding means 15
Thereby, the magnetic tape 2 corresponding to a predetermined amount, for example, one second of the tape length, is rewound. The state of the magnetic tape 2 after being rewound is shown by FIG. 6F.

After step S107, control returns to step S104 again.
It enters a waiting state until the next intermittent recording command is input.
6G to 6K are schematic diagrams showing the repetition processing from step S104 to step S107. From the state shown in FIG. 6F, the magnetic tape 2 is brought into the state shown in FIG. 6G by running the tape at a constant speed for one second. Subsequently, the video signal 65 is generated by the head 28 and the C
The TL signal 66 is recorded on the magnetic tape 2 respectively. This situation is shown in FIG. 6H. When the recording of the signal is completed, the magnetic tape 2 corresponding to one second is rewound with reference to FIG. 6I.

FIG. 6J shows a state of the magnetic tape 2 after the tape is driven at a constant speed for one second from the state shown in FIG. 6I,
FIG. 6K shows that the video signal 67 is further
The state of the magnetic tape 2 on which the CTL signal 68 is recorded by the signal head 9 is shown. In this way, an image is intermittently recorded on the magnetic tape 2.

[Problem to be Solved by the Invention] In the conventional video magnetic recording apparatus, the CTL signal is simultaneously recorded at the time of recording the video signal as described above. When the intermittent recording is interrupted / restarted, the recording of the CTL signal is interrupted and restarted, and as a result, it is inevitable that a phase shift occurs in the CTL signal. Therefore, if an attempt is made to perform intermittent recording with a smaller fixed number of frames, the number of intermittent recordings per fixed length of the magnetic tape increases, and therefore the frequency of occurrence of a phase shift of the CTL signal increases. For example, in the case of a relational recording of three frames (corresponding to 0.1 second during reproduction), 10 phase shifts of the CTL signal occur per second during reproduction. For this reason, there is a problem in that the tape running is disturbed due to the phase shift of the CTL signal when the video signal is reproduced, and a clear video cannot be obtained.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a video magnetic recording apparatus capable of obtaining a clear image at the time of reproduction even if intermittent recording is performed in a shorter recording time than in the past. The purpose is to:

[Means for Solving the Problems] A video magnetic recording apparatus according to the present invention is for intermittently recording a video signal on a magnetic tape, and runs on the magnetic tape when reproducing the video signal. A CTL signal recording / reproducing means for recording or reproducing a CTL signal defining a reference timing for controlling the speed of the CTL signal;
A video signal recording means for recording a video signal on a magnetic tape, and a CTL signal for a predetermined period of time before the intermittent recording at a normal running speed at every predetermined number of intermittent recordings. When performing intermittent recording, the CTL signal is reproduced, and in response to the reproduced CTL signal, the CTL signal is recorded / recorded so that the video signal is recorded on the magnetic tape.
Intermittent recording control means for controlling the reproduction means and the video signal recording means.

[Operation] The CTL signal recording / reproducing means is controlled by the intermittent recording control means, and outputs the CTL signal at a normal traveling speed for a predetermined time before the intermittent recording at a predetermined number of intermittent recordings. Record on magnetic tape. The intermittent recording control unit further records the video signal so as to be synchronized with the CTL signal in response to the reproduced CTL signal while reproducing the recorded CTL signal during the intermittent recording of the video signal. At the time of intermittent recording, only the CTL signal is reproduced as described above, and the video signal is intermittently and repeatedly recorded in synchronization with the reproduced CTL signal.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, the same components as those of the conventional video magnetic recording apparatus shown in FIG. 4 are denoted by the same reference numerals, and have the same names. Therefore, their detailed description will not be repeated here.

Referring to FIG. 1, the difference between the video magnetic recording apparatus of the present invention and the conventional video magnetic recording apparatus is that a new intermittent recording control means 23 is used instead of the intermittent recording control means 26 in the conventional apparatus.
It is to include. The difference between the intermittent recording control means 23 and the conventional intermittent recording control means 26 is that
In addition to the 26 components, CT
This is to include continuous recording control means 27 for recording only the CTL signal on the L signal recording track 2b. The intermittent recording control means 23 is a CTL signal switching control means 30 in the conventional apparatus.
Instead of the phase control means 16 and the continuous recording control means
And a CTL signal switching control means 29 connected to the control signal switching means 27.

The continuous recording control means 27 controls the capstan driving device 11 to record the CTL signal on the magnetic tape 2 and simultaneously sends the CTL signal to the CTL signal head 9 via the CTL signal input / output switching device 12. Continuous recording means 21; an intermittent recording number counter 25 which counts the number of intermittent recordings by the intermittent recording means 17 and detects that it becomes equal to a predetermined number and outputs a signal to that effect, and an intermittent recording number counter 25 A continuous recording control command output signal 24 for outputting a continuous recording control command signal to the continuous recording means 21 in response to a signal output from
And a recording amount counter 22 for counting the recording amount of the CTL signal on the magnetic tape 2 by the continuous recording means 21.

The phase control means 16 is connected to the intermittent recording means 17 unlike the conventional apparatus. This indicates a synchronization signal for synchronizing the reproduction of the CTL signal by the CTL signal head 9 and the recording of the video signal by the intermittent recording means 17.

Next, the operation of the magnetic image recording apparatus 1 according to the present invention having the above-described configuration will be described with reference to FIG. An intermittent recording control command is input to the intermittent recording control unit 23 by an operator using an input unit (not shown). Prior to the repetition of the intermittent recording, a continuous recording control command is generated by the continuous recording control command output means 24 and input to the continuous recording means 21 in order to first perform the continuous recording of the CTL signal on the magnetic tape 2 once. You. A predetermined amount is set in the recording amount counter 22, and a predetermined value is also set in the intermittent recording number counter 25. In response to the continuous recording control command, the continuous recording means 21 drives the capstan driving device 11 to move the magnetic tape 2 in a predetermined direction. The continuous recording means 21 sends a CTL signal recording switching signal to the CTL signal switching control means 29. The CTL signal switching control means 29 controls the CTL signal input / output switching device 12 in response to the CTL signal recording switching signal, and connects the connection to the continuous recording means 21.
Switch to side. As a result, the continuous recording
The CTL signal is recorded on the CTL signal recording track 2b via the signal head 9.

When the continuous recording of the CTL signal of the recording amount set in the recording amount counter 22 ends, the control is transferred to the tape rewinding means 15. Prior to rewinding the magnetic tape 2, a predetermined value is set in the tape rewind amount counter 18 in order to rewind the magnetic tape 2 to the continuous recording start position. Tape rewinding means 15
Rewinds the magnetic tape 2 by the rewind amount set in the tape rewind amount counter 18, and the apparatus enters a waiting state.

Hereinafter, the intermittent recording operation of the video is repeated. When an intermittent recording command is input to the intermittent recording control means 23 by the operator, the CTL signal on the magnetic tape 2 is reproduced by the phase control means 16 which performs the same operation as in the prior art. Is performed at a constant speed. After the predetermined amount of the CTL signal has been reproduced, the intermittent recording means 17 performs intermittent recording of a fixed number of frames. At this time, the CTL signal is reproduced at the same time by the CTL signal head 9, and the phase control means 16 keeps the magnetic tape 2 running at a constant speed in synchronization with the reproduced CTL signal. At the same time, only the video signal is recorded on the video signal recording track 2a by the recording control device 14. When one intermittent recording is completed, the tape rewinding amount counter 18 and the tape rewinding means 15 rewind the magnetic tape 2 by a predetermined amount, and the apparatus is temporarily stopped. At this time, counting by the intermittent recording number counter is performed.

Until the next continuous recording control command is input, the above-described intermittent recording is repeated for each intermittent recording control command. When the end of the predetermined number of intermittent recordings is detected by the intermittent recording number counter 25, a continuous recording control command is input from the continuous recording control command output means 24 to the continuous recording means 21, and thereafter, the above operation is repeated. It is.

When the video signal is intermittently recorded in this manner, the number of interruptions and restarts of the recording of the CTL signal is irrelevant to the time per one intermittent recording. That is, it is a continuous recording means
It is determined by the time of continuous recording of the CTL signal by 21. Therefore, even if the intermittent recording of the video signal is repeated for a short intermittent recording time, the frequency of the phase shift occurring in the CTL signal does not increase. Therefore, even when the video signal is reproduced, the CTL signal for controlling the tape running does not have a particularly large disturbance, and a clearer image can be obtained as compared with the conventional apparatus.

FIG. 2 is a flowchart of a program when the intermittent recording control means 23 is realized by a controller.
FIGS. 3A to 3K are schematic diagrams showing the states of the CTL signal and the video signal recorded on the magnetic tape 2 at that time.

Referring to FIG. 2, this program starts operation when intermittent recording is designated by an operator,
Initial setting is performed in S1. The state of the magnetic tape 2 at this point is shown in FIG. 3A. 3A to 3K, the arrow 9a indicates the position of the CTL signal head 9,
Arrow 28a represents the position of head 28. Point A represents a fixed point on the magnetic tape 2 at a position corresponding to the head 28 at the start of the intermittent recording.

In step S2, the continuous recording means 21
The L signal 53 is recorded for 4 seconds. FIG. 3B shows the state after the recording of the CTL signal. Referring to FIG. 3C, the steps
In S5, a predetermined amount of tape, that is, the magnetic tape 2 having a length corresponding to the tape length of 4 seconds in this example, is rewound. The device enters a waiting state in this state.

In step S6, the number “20” is set in the intermittent recording number counter 25, for example. Subsequently, control proceeds to step S7.
In step S7, it is determined whether an intermittent recording command has been input to the intermittent recording control unit 23. This corresponds to determining whether or not to continue the above-described waiting state. When the intermittent recording command is input, the control moves to step S8.

In step S8, referring to FIG. 3D, the CTL signal is reproduced by the CTL signal head 9, and the tape is driven at a constant speed by the phase control means 16 for one second in synchronization with the reproduction. Subsequently, the control proceeds to step S9, and referring to FIG. 3E, the CTL signal is reproduced by the CTL signal head 9, and the tape is maintained at a constant speed by the phase control means 16. At the same time, the intermittent recording means 17 records three video signals (0.1 seconds) on the video signal recording track 2a via the recording control means 14 and the head 28.

Subsequently, control is passed to step S10, and the magnetic tape 2 is rewound by a predetermined length, in this case, by a length corresponding to one second of the tape length. The state after rewinding is shown in FIG. 3F. Subsequently, 1 is subtracted from the content of the intermittent recording number counter 25 in step S11. In step S12, it is determined whether or not the content of the intermittent recording number counter 25 is equal to zero. If the condition is not satisfied, the control proceeds to step S7, and if the condition is satisfied, the control proceeds to step S3. As a result, a video signal of 0.1 second is recorded on the magnetic tape 2.

3G to 3K show that the content of the intermittent recording number counter 25 is
It shows the repetition of steps S7 to S12 when it is not equal to 0. That is, referring to FIG. 3G, after the intermittent recording command is input, the magnetic tape 2 runs at a constant speed for one second. Subsequently, referring to FIG. 3H, the CTL signal is reproduced, and the constant speed running of the magnetic tape 2 is maintained, and at the same time, the video signal 55 corresponding to the next intermittent recording section is recorded for the same three frames. Referring to FIG. 3I, the tape is rewound for another 1 second.

Referring to FIG. 3J, the magnetic tape 2 runs at a constant speed for one second again in response to the next intermittent recording command. Followed by
Referring to the 3K diagram, following the previously recorded video signal 55,
Similarly, a video signal 56 for three frames is recorded. As described above, by repeating the processing of steps S7 to S12, the video signal covering a very small number of frames is intermittently recorded.

If it is determined in step S12 that the content of the intermittent recording number counter 25 is equal to 0, the control proceeds to step S3.
In step S3, the CTL signal is reproduced by the CTL signal head 9 and the phase control means 16, and in response to the reproduced CTL signal, the magnetic tape 2 travels at a constant speed of 1 speed.
For a second. Further, the control proceeds to step S4, and the recording of the CTL signal is performed by the continuous recording means 21 via the CTL signal head 9 for further 3 seconds. Then the control is step
Return to S5. Thereafter, the above operation is repeated.
By repeating the above operation, a video signal intermittently recorded every 0.1 second is formed on the video signal recording track 2a.

On the other hand, in the CTL signal 53 recorded on the magnetic tape 2, even if the intermittent recording time of the video signal is shortened, the frequency of occurrence of the phase shift of the CTL signal itself does not increase.
This is because the CTL signal 53 is recorded on the magnetic tape 2 in advance, and the CTL signal is only reproduced when recording a video signal. Therefore, even when the video signal formed by the above operation is reproduced, the CTL signal is less likely to be out of phase and stable tape running can be realized. Therefore, the reproduced video is clear.

[Effect of the Invention] As described above, in the video magnetic recording apparatus according to the present invention, the CTL signal is recorded on the magnetic tape prior to the intermittent recording. At the time of intermittent recording, the CTL signal is reproduced, and the CTL signal is recorded so that the video signal is recorded in response to the reproduced CTL signal.
The signal recording / reproducing means and the video signal recording means are controlled. Since the recording of the CTL signal is performed separately from the intermittent recording of the video signal, the recording of the CTL signal may be interrupted and restarted every time the recording operation of the video signal is performed intermittently, causing a phase shift. Absent. Therefore, even if the intermittent recording time of the video signal is shortened, the frequency of occurrence of the phase shift of the CTL signal does not increase. That is, the CTL generated during the unit time
The signal disturbance does not increase.

When reproducing the video signal, the CTL signal is reproduced, and the running of the magnetic tape is controlled in synchronization with the reproduced CTL signal. Since the phase disturbance generated in the CTL signal is small, the running of the magnetic tape is also performed stably. Therefore, the reproduction of the video signal is also performed stably, and the video signal is less likely to be disturbed by the disturbance of the tape running.

Therefore, even if intermittent recording is performed in a short recording time, it is possible to provide a video magnetic recording apparatus capable of obtaining a clear video during reproduction.

[Brief description of the drawings]

FIG. 1 is a block diagram of an image magnetic recording apparatus according to the present invention. FIG. 2 is a flowchart of a program when the image magnetic recording apparatus according to the present invention is controlled by a controller. FIG. 3K is a schematic diagram showing a video signal and a CTL signal recorded on a magnetic tape according to the present invention. FIG. 4 is a block diagram of a conventional video magnetic recording apparatus. Fig. 6A to Fig. 6K are schematic diagrams showing video signals and CTL signals recorded on a magnetic tape by a conventional video magnetic recording device. In the figure, 2 is a magnetic tape, 9 is a CLT signal head, 12 is a CTL signal input / output switching device, 14 is a recording control device, 14 is a tape rewinding device, 16 is a phase control device, 17 is an intermittent recording device, and 21 is an intermittent recording device. Continuous recording means, 23 is intermittent recording control means, 27 is continuous recording control means, and 30 is CTL signal switching control means. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

(57) [Claims] 1. A video magnetic recording device for intermittently recording a video signal on a magnetic tape, the video magnetic recording device being adapted to control a running speed of the magnetic tape during reproduction of the video signal on the magnetic tape. Traveling control signal recording / reproducing means for recording or reproducing a traveling control signal for determining a reference timing; video signal recording means for recording the video signal on the magnetic tape; Prior to the intermittent recording, the running control signal is recorded on the magnetic tape at a normal running speed for a predetermined period of time before the intermittent recording, and thereafter the intermittent recording is performed for the predetermined number of times or less. When the intermittent recording is performed each time, the travel control signal is reproduced, and the video signal is recorded on the magnetic tape in response to the reproduced travel control signal. The travel control signal recording / reproducing means and a video magnetic recording apparatus comprising said intermittent recording control means for controlling a video signal recording means so as to.