JPS6129055B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording device such as a VTR that runs a tape intermittently.

2. Description of the Related Art Conventionally, VTRs have been known in which still images, slow motion images, etc. are obtained by running a tape intermittently during playback. This kind
In order to feed the tape intermittently in a VTR, for example, a pinch roller is turned on and off at a predetermined period on the capstan.
I'm trying to turn it off. The on/off state of this pinch roller is controlled based on the CTL signal recorded for each frame of the tape, and this is used to advance the frame of the tape and track the rotating head. There is.

It is conceivable that various images can be obtained during playback by running the tape intermittently during recording on a VTR. For example, if a tape recorded by running every n frames is played back at normal speed, then n
Double speed images can be obtained. Animated images can also be obtained by manually feeding the tape intermittently.

However, even if you try to intermittently advance the tape at a precise cycle during recording, CTL
Since no signals are recorded, there is no reference for controlling the pinch rollers on and off. For this reason, for example, a method can be considered in which, prior to recording, only the CTL signal is recorded in advance while the tape is continuously run at a steady speed, but this is very time-consuming. It is also possible to use a pulse motor to feed the tape intermittently, but there is a problem with the accuracy of the amount of intermittent feed of the pulse motor.

The present invention is intended to solve the above-mentioned problems,
Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a case in which the present invention is applied to a conventionally known VTR, in which a tape 1 is fed out from a supply rail 2, passes between a pinch roller 3 and a capstan 4, and is further passed through a tension arm 5. From there, it passes through a rotating drum 6 having heads A and B, passes between a CTL reproducing head 7, a pinch roller 8 and a capstan 9, and is wound onto a take-up reel 10. The tension arm 5 rotates against the spring 17 when the tape 1 is pulled, so when this rotation is detected, the capstan 4 is rotated and the tape 1 is fed out to a predetermined position. It is designed to provide tape tension.

In this example, the FG is directly connected to the capstan 4.
A (frequency generator) 11 is provided, and a recording head 12 in contact with the tape 1 wound around the pinch roller 3 is also provided. A pulse of approximately 30 Hz obtained from the FG 11 corresponding to the rotation of the capstan 11 is applied to the recording head 12 through an amplifier 13. Furthermore, the CTL signal reproduced by the CTL reproduction head 7 is counted by a 1/n counter 14, and by applying this count output to the pinch roller driving plunger 16 through an amplifier 15,
The pinch roller 8 is turned on and off.

According to the above configuration, from the FG 11, the tape has a cycle that substantially corresponds to the amount of movement of the tape 1 on a 1:1 basis.
A 30Hz pulse is obtained. This pulse is used as a CTL signal to record the CTL of tape 1 by the recording head 12.
By recording on the track, the CTL signal that follows the movement of the tape 1 can be recorded before it reaches the CTL playback head 7. This CTL signal is regenerated by the CTL reproducing head 7 and output to the counter 1.
The frequency is divided by 4 to 1/n. By controlling the on/off state of the pinch roller 8 based on this counter output, the tape 1 is intermittently run every n frames. Therefore, if a video signal synchronized with the CTL signal is supplied to the rotary heads A and B and recorded on the tape 1, an n-times speed image can be obtained when the tape 1 is normally played back. Also this
By detecting the phase difference between the CTL signal and the pulse from the pulse generator provided on the drum 6, capstan servo can be applied to the capstan 9.

The present invention includes means 4 and 11 for generating pulses with a period that follows the movement of the tape 1, and means 4 and 11 disposed upstream of the CTL signal reproducing head 7 in the running path of the tape to generate the pulses when recording a video signal. A recording head 12 for recording on a tape, a counter 14 for dividing the frequency of the pulses reproduced by the CTL reproduction head during the recording, and means 8 for intermittently running the tape during the recording based on the output of the counter. , 9, and 16.

Therefore, according to the present invention, while recording a video signal, it is possible to record a CTL signal that accurately follows the movement of the tape just before recording the video signal, so that the intermittent feeding means can be activated by this CTL signal. can be controlled. This allows traditional VTR
It is possible to make the tape advance intermittently during recording without changing the standard. If a tape recorded in this manner is normally played back, high-speed images can be obtained.

[Brief explanation of the drawing]

The drawings are a schematic plan view and circuit block of the main parts of a VTR showing an embodiment of the present invention. In addition, in the symbols used in the drawings, 1...
...tape, 4,9...capstan, 8...pinch roller, 11...FG, 12...recording head,
14...1/n counter, 16...plunger.

Claims (1)

[Claims] 1 means for generating pulses with a period that follows the movement of the tape, and means for generating pulses with a period that follows the movement of the tape,
a recording head disposed upstream of the CTL signal reproduction head for recording the pulses on the tape when recording a video signal; a counter for dividing the frequency of the pulses reproduced by the CTL reproduction head during recording; and means for intermittently running the tape during the recording based on the output of the video signal.