SU577508A1 - Minimum pulse front duration meter - Google Patents

Description

one

The invention relates to television measurements and can be used to monitor and measure the minimum duration of video signal fronts in the equipment for monitoring television centers, and as an image sharpness sensor in adaptive television systems.

The known meter of the minimum duration of the front of pulses contains a signal-to-pulse differential converter, the input of which is connected to the input of the driver of control signals, a delay element, and an indicator device 111.

However, this meter has insufficient accuracy due to anayo pry signal processing and the dependence of the readings on the shape of the front.

The aim of the invention is to improve the accuracy of the meter.

For this purpose, in the meter of the minimum duration of the fronts of the pulses, containing the transform of the b differential. signals to the pulse, the input of which is connected to the input of the control signal generator, the delay element, the indicator device, in addition, but a time converter

interval-code, shaper start-stop signals, arithmetic mouth. roystvo Moreover, the output of the signal-to-pulse converter is connected to the start-stop signal generator, to the input of the delay element and to the first input of the time interval-code converter, the second and third inputs of which are connected to the output of the start-stop signal generator. In this case, the first output of the control signal generator is connected to the input of the indicator device, and the inputs of the arithmetic device are connected, respectively, to the outputs of the time-code-converter, to the output of the delay element, and to the outputs of the indicator device. The drawing shows a structural diagram of the meter.

It contains a converter of 1 signal-to-pulse differential, a shaper of 2 control signals, a shaper of 3 start-stop pulses, a 4-delay element, a converter of 5 time interval — a code, an arithmetic unit 6, and an indicator device 7.

Shaper 3 includes dividers and 9 voltages, delay line 10, and comparison devices 11 and 12.

The device b comprises a comparing device 13, a memory block 14, elements 15 and 16, and a delayed signal shaper 17. Device 7 contains an AND 18 element, a memory block 19, a decoder 20, a digital digit. the board 21, the pho 5mirror 22 delayed signal .., the input; converter 1 is connected to the input of the imaging unit 2, and BOY5: one with the inputs of the divider 8, 9 and the line and also the input of element 4 and the first input of the converter 5, the other two inputs of which are connected to the outputs of the imaging unit 3.

The inputs of the device b, which are the input of the generator 17, the first and second inputs of the element 16 and the group of inputs of the device 13, are connected respectively to the output of the device 7 of the generator 22, the first output of the generator 2, the output of the element 4 and the group of outputs of the converter 5. Group The outputs of the device are the outputs of the block 14, connected to the inputs of the element 18 entering the device 7, the other input of the device 7 is connected to the second input of the driver 2.

The meter works as follows.

The signal under study is fed to the converter 1 and the driver 2. The output of the generator 2 produces extended damping pulses that prevent the measurement of the duration of the edges of the damping and synchronizing pulses, and the field pulses passing through the driver 17 and setting in block 14 the code corresponding to the maximum measured front value of the original signal.

The pulses formed in converter 1, the duration of the fronts and the span of which are equal to the duration of the fronts and the span of the corresponding drops of the pulse under study, enter the converter 5, preparing it for measurement, to the input of element 4, which forms the polling pulse, as well as through the line 10 - to the first inputs are compared with vacuum devices 11, 12 and through dividers 8.9 to the second inputs of devices 1 12.

divider transfer coefficient 8. and 9 is determined by the levels at which the front duration is measured. The length of the delay of line 10 is chosen so that the tip of the pulses after passing through line 10 coincides in time with the front, front of pulses passing through dividers 8, Y.

At the output of the device, the start-stop pulses corresponding to the duration of the fronts of the pulse under investigation are formed.

In the converter 5, a code is formed from start-stop pulses corresponding to: the duration of the edges of the monitored signal.

The resulting code enters the device 13 and is compared with the code pre-installed in block 14. If the duration of the measured front is less than that recorded in block 14, then on the input of the device 13 a resolution signal is generated and a pulse from the output of the former 3 pr. And 15, -resolving the rewriting of information from the converter 5 to the block 14. otherwise, no rewriting of information occurs.

Thus o6 pa30Mj. At the end of the image frame in block 14, the code corresponding to the minimum duration of the fronts of the signal under investigation will be recorded.

The field pulse from the imaging unit 2 erases the information recorded in block 19 and through the imaging unit 22 enters the input of element 18, allowing the information to be overwritten from block 14 to block 19. This code is converted to decimal in the decoder 20 and displayed on the digital display 21.

Claims (1)

1. Copyright certificate of the USSR. It 314326, cl. H04; N 7/02, 15.05.70. ps i; f k f-