SU1474735A1 - Autotracking device - Google Patents

Abstract

This invention relates to a magnetic video recording technique. In order to increase the speed of the process of combining the trajectories of the video heads with the recording tracks, an actuator with a roller 7 was added to the device, forming a magnetic tape loop between the second 5 and third 6 bypass guide rollers, and the automatic movement phase control unit of the tape. The device makes it possible to reduce the inertia of the system for regulating (adjusting) the phase of the movement of the tape and to reduce the level of interference at the output of the television device.

Description

ka 4 rotation of the drum on the shaft of diabetes 15. DVI-40 will not be rebuilt, because

LED 15 is controlled by SARCD 16 by reference pulses (25 Hz). The actuator is controlled by AFDS 17 by signals from the sensor on the LED shaft and the control pulse from the control head 8.

The device works as follows.

When the VCR is turned on, the SARSD 15 system adjusts the rotational speed of the RHD 1 according to the frequency of the reference clock pulses (with a frequency of 25 Hz for a standard of 25 frames or 50 fields of time 45

50

the frequency of the tracking control pulses does not change. The phase change of the control pulses will be monitored by the ARSFL and the corresponding phase change between the rollers 5 and 6 will again establish the required phase correspondence. During the advanced phase of the magnetic tape, the SARFPL generates a signal to the executive body, which leads to a decrease in the loop length, which causes a short deceleration of the tape stretch and restoration of the correct following of video heads along the tracks

the frequency of the tracking control pulse does not change. The change in the phase of the control pulses will be monitored by the SARPH and the corresponding change in the length of the loop of the tape between faces 5 and 6 will again establish the required phase correspondence. At the advanced phase of the SARFPL magnetic tape, the actuator generates a signal leading to a decrease in the loop length, which causes a short deceleration of the stretching of the tape and the restoration of the correct following of video heads along the path

l in 1 s).

At the same time, SARSL 14 adjustment records. In the lagging phase, SARPHF rotates the frequency of HP 12 in such a way that it generates a signal to increase by 3, so that the speed of drawing the magnetic tape corresponds to 50 recording tracks per second. The work of SARSL is based on the magnetic tape loop, which means a short-term accelerated pulling of the tape past the RHD.

five

0

the frequency of the tracking control pulses does not change. The phase change of the control pulses will be monitored by the ARSFL and the corresponding phase change between the rollers 5 and 6 will again establish the required phase correspondence. During the advanced phase of the magnetic tape, the SARFPL generates a signal to the executive body, which leads to a decrease in the loop length, which causes a short deceleration of the tape stretch and restoration of the correct following of video heads along the tracks

records In the lagging phase, SARPHF generates a signal to increase

the length of the loop of the magnetic tape, which causes a short-term accelerated pulling of the tape past the RHD.

31474

Claims (1)

Claims Auto-tracking device comprising a first bypass roller sequentially arranged along a magnetic tape movement, a rotating magnetic heads unit, a second and third bypass rollers, a magnetic control head and a drive shaft, kinematically connected with the actuator of the magnetic tape movement automatic control unit, the first the input of which is connected to the output of the magnetic control head, and the second input - to the rotation sensor of the magnetic heads, kinematically connected with The automatic motor of the automatic adjustment of the rotation speed of the magnetic heads, the first input of which is connected to the rotation sensor of the magnetic heads block, and the second input - to the source of clock pulses, characterized in that, in order to reduce the time it takes for the video heads to align motion with the recording tracks, it is additionally entered an actuator with a roller and an automatic control unit for the movement phase of the magnetic tape, the first input of which is connected to the output of the rotation sensor of the magnetic goal block The second input is with the output of the magnetic control head, and the output is connected to the input of the actuator with a roller located between the second and third by-pass rollers.