SU471687A1 - A device for storing a full television signal - Google Patents

Description

The invention relates to television technology and is used in television standard converters and television automation systems.

Known devices for storing a complete television signal containing a clock generator and a switch, the inputs of which are supplied with a full television signal, the second input of the switch connected to the output of the read level generator, the third input to the first input of the control signal generator, and the output to the first input an accumulator that stores a cathode-ray tube connected to a spiral sweep generator and an output connected via a preamplifier to a level fixation circuit, a key that controls progress coupled to the second input of the control signal fed to the input of which the signal "sample not provide automatic correction of the unevenness of the video signal and the background level.

The purpose of the invention is to provide automatic correction of video signal unevenness in the background and level.

This is achieved by connecting the output of the adder through the pilot-mixing unit to the recording input of the storage tube, and the output of the level fixing circuit is connected through the serially connected pilot selector and the envelope selection unit to the second input of the adder and the control level controller. video signal whose input is connected

with the output of the level fixing circuit, and the output with the key input; in addition, the third output of the control signal generator is connected to the control input of the pilot selector signal.

The drawing shows a block diagram of a device for storing a complete television signal.

A device for storing a complete television signal consists of a former

1 control signals providing connection through switch 2 to input of adder 3 or video signal sample or generator output 4 read levels, clock generator 5 synchronizing operation

of all units of the device, a storage electron tube 6, a spiral scanning generator 7, a level fixing circuit 8, a preamplifier 9, a pilot selector 10, a pilot envelope extracting section 11, a video signal level regulator 12, a key 13 and a replacement block 14 -signal.

The device works as follows. By command coming from the shaper

1 control signal starts the cycle

records In this case, the switch 2 drains the selection of the outgoing sample of the television signal, which through the adder 3 and the mixing unit 14 and the pilot signal, supported by the horizontal pulses of the synchro generator 5, is fed to the storage cathode 6 operating in the recording mode. The signal is recorded according to the law of helical sweep with the help of a helical sweep generator-7.

Due to the absence of the beam wrapping for a reverse stroke along the line in a spiral scan, the unevenness of the background and video signal level is reflected at the black (white) level, so that the irregularity of the video signal background across the field can be eliminated using the level fixing scheme 8. In the pilot pilot signal block 14, the pilot signal is replaced at the horizontal gain intervals of the original video sample. The video signal from the load resistance of the storage cathode-ray tube 6 is fed to the input of the preamplifier 9, from the output of which is fed to the pilot selector 10. From the output of the latter, a sequence of pilot signals is supplied to a pilot envelope allocation section 11. The selected envelope is a signal of unevenness of the video signal level over the frame. From the output of the pilot-envelope selection block 11, the signal signal level unevenness over the frame, is fed to the input of adder 3 to create predrambling in the original video signal sample and to the input of the video signal level adjuster 12. From the exit

the last read signal through the key 13 is fed to the output of the device.

Subject invention

A device for storing a complete television signal containing a synchronous generator and a switch, the inputs of which are supplied with a full television signal, the second input of the switch connected to the output of the read level generator, the third input to the first input of the control signal generator, and the output to the first input of the adder storage tube connected to the generator

spiral scan and output connected through a pre-amplifier to the level fixing circuit, a key controlling the input connected to the second input of the control signal shaper, to the input

which signal is "sampled", characterized in that, in order to automatically correct the unevenness of the video signal in the background and level, the output of the adder is connected to the input through the pilot mixing unit

recording a storage electron tube, and the output of the level fixing circuit is connected via serially connected pilot selector and envelope selection unit to the second input of the adder and to the control input of the video signal level regulator whose input is connected to the output of the level fixing circuit and the output to the input the key, in addition, the third output of the driver of the control signal is connected to the control input of the pilot signal selector.