SU1697272A1 - Picture signals generator - Google Patents

Abstract

The invention relates to a technique of television and can be used in systems for receiving and recording an image signal. The purpose of the invention is to improve accuracy. The input video signal enters the selector 2 small pulses. The delay element 3 generates voltage potentials corresponding in time to the presence of a maximum and minimum value string in the video signal. At the required time intervals are triggered.

Description

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the first and second keys 4 and 6, as a result of which the minimum and maximum values of the string signal are stored in memory elements 5 and 7, respectively. The second subtractor 9 determines the difference in input voltages, and the first subtractor 8 shifts the input video signal to the minimum level. The voltage dividers 10, the comparator 11 and the adder 12 form a level-quantized signal, taking into account the values in the elements 5 and 7 of the memory. Zil.

The invention relates to a technique of television and can be used in systems for receiving and recording an image signal.

The purpose of the invention is to improve accuracy.

FIG. Figure 1 shows the electrical structure of the image signal forming device; in fig. 2 shows timing diagrams for explaining the operation of the image signal forming apparatus; in fig. 3 shows the structure of the line and the synchronizing pulse used in the device for forming the image signal,

The image signal shaping device comprises an input 1, a selector 2 horizontal sync pulses, a delay element 3, a first key 4, a first memory element 5, a second key 6, a second memory element 7, the first 8 and the second 9 subtractors,

first, second, nth dividers 10.1, 10.2 ...

10p is voltage, respectively, comparator 11, adder 12 and output 13.

The imaging device operates as follows.

The operation of the device is based on detecting the synchronization pulses of the video signal lines, determining and storing the maximum value (black level) in a given part of the line and then forming it by dividing the reference levels by fixed coefficients, at the intersections of which the quantized video signal is produced by the input video signal. In this case, the minimum value (white level) of the video signal is measured and remembered, the differential voltages of the maximum and minimum values of both the input video signal and the minimum value are determined, and reference levels are formed from the first differential voltage when the second differential voltage generates a quantum video signal .

Thus, the quantization scale is formed from the voltage drop between the maximum and minimum overhead values in a video signal line.

FIG. Figure 2a shows the video signal of the line, varying between the maximum.

and a minimum of 11 min, in fig. 26 shows the video signal shifted by the value of the minimum Umin value, compared with the reference levels Uoi.

which are formed from the difference (Umax - Umin) of the maximum and minimum values, and in FIG. 2c is a view of a quantized video signal.

FIG. For the selected structure of the video signal line, each line contains the synchronizing pulse CA of the line of channel A, the SC signal of open space scanning, information signal of the line in the television range

the radiation, the TA signal of the telemetric information of channel A, the synchronizing pulse CB of channel B, the signal KB of space scanning in the infrared range of radiation, the information signal B in the infrared range of radiation and the TV signal of telemetric information of channel B.

The sync pulse of the strings of channel A (FIG. 36) contains seven elements of a sync series with a duration of 2t0 (up to 0.24038 ms),

after which the minimum value Umin of the space scan in the television radiation range is established, and the synchronizing pulse of the B-channel row contains seven elements

3t0, after which the maximum Umax value of the scanning of the cosmos in the infrared range of the radiation is set. From the input video signal, the line clock pulses are extracted. For example, when processing the signal indicated in FIG. In favor, the presence of a clock pulse CA of the scanning channel of the observed surface is detected in the television measurement range, which is represented by a series of pulses of a certain duration (Fig. 36, c). Similarly, the sync pulse of the CB channel is scanned of the observed surface in the infrared radiation range (Fig.

ZB, c), At the end of the synchronization pulses of the lines of channels A and B, the minimum Umin and maximum Umax values of the video signal are set, corresponding to the results of scanning open space in the television and infrared radiation ranges

(Fig. 36.c), Imax voltage and 1) Min is remembered for the full line of the video signal (Fig. 2a). The minimum value of UMHH (Fig. 2a) is subtracted from the input video signal U (t), and the difference signal is compared to the reference levels Uoi (Fig. 26), which are formed by dividing the maximum UMHH video signal of the line by the specified coefficients This quantization scale can be formed both linearly (with a constant step between adjacent reference levels) and the linearly responsible function of the video signal level to the physical parameter of the observed surface, such as radiation temperature round. The output video signal obtained in this way (Fig. 2c) is a voltage level quantized between the maximum (black level) and minimum (white level) values of the video signal in a line.

The input video signal at input 1 is fed to the selector 2 small pulses. The delay element 3 generates voltage potentials corresponding in time to the presence in the video signal of a maximum and minimum value string.

At the corresponding time intervals, the first 4 and second 6 keys are triggered, as a result of which the minimum and maximum values of the string signal are stored in elements 5 and 7 of the memory, respectively. The second subtractor 9 determines the difference in input voltages, and the first switch 8 shifts the input video signal to the minimum level. With the Moaibio dividers 10.1, 10.210.p, the voltage levels of the reference levels are created, creating a quantization scale. The comparator 11 compares the input voltage from the output of the first subtractor 8 with the reference levels and outputs rectangular voltages to its separate outputs when the input information signal exceeds the corresponding reference level. The adder 12 performs the summation of the input voltage potentials and outputs a 13-level quantized video signal at the output 13.

Claims (1)

The invention of the image signal forming apparatus comprising a series-connected horizontal sync pulse selector, whose input is an input of the image signal forming apparatus, a delay element, the first output of which is connected to the control input of the first key, the information input of which is connected to the input of the horizontal sync pulse selector, the output of the first key is connected to the input of the first memory element, the second output-delay element is connected to the control input of the second key, The input of which is connected to the input of the lowercase clock selector, the output of the second key is connected to the input of the second memory element, a comparator and voltage dividers, the inputs of which are interconnected and the outputs connected to the corresponding inputs of the comparator, which differs from in order to improve accuracy, the first and second subtractors and an adder, the output of which is the output of the image signaling device, are introduced, and n inputs of the adder are connected to the corresponding outputs of the comparator, the first input is first The subtractor is connected to the input of the lowercase clock selector, the second input is connected to the first input of the second subtractor and the output of the first memory element, the second input of the second subtractor is connected to the output of the second memory element, and the output of the first subtractor connected to the (n + 1) th input of the comparator. I washed n /  / at J J L fig 2