SU1444879A1 - Device for shaping horizontal lines on television indicator screen - Google Patents

Description

G8

nineteen

oo h

with

ipas.l

The invention relates to automation and computing and can be used to display information in the form of a histogram on a television indicator.

The purpose of the invention is to increase the capacity of the device.

Figure 1 shows the block diagram of the device; figure 2 is an example of the output information ..

The device contains a generator of 1 pulses, an input of 2 lower case damping pulses, the first counter 3, digital-analog converter 4, register 5, the second KQNmapaTOp 6, the first element And 7, the second counter 8, the switch 9, the information inputs 10 of the device, the third counter 11 , the first element OR 12, the element NOT 3, the second element AND 14, the third element AND 15 the first comparator 16, the second element OR 17, the driver 18 pulses, the output 19 of the device, the input 20 frame damping pulses of the device. ,

The device operates as follows.

The television frame is divided into horizontal stripes (FIG. 2), the number of which is equal to the number of input-displayed analog signals and is determined by the number of inputs of the switch 9. To each band correspond to its analog input, the switch 9 controls the counter 8, the bit which is equal to

m log, j K, (O

where K is the number of inputs of the analog switch 9.

The width of the horizontal strip is a multiple of the width of the line of the television raster. The number of TV lines in a band is determined by the width of the estimator 11 and is equal to 2, where n is the width of the counter 11. At the beginning of each frame, the counters (8, 11) are wrapped with a frame damping pulse 20. A continuous damping pulse 2 controls the operation of the master oscillator 1 and is supplied to the clock input of the counter 11. The counter 11 counts lower case fading pulses, which in fact means the counting of lines in the strip. After counting 2 lines, the next lower-order sync pulse turns counter 1 into the zero state. The state of the outputs of the counter 11 analyzes the first element OR 12 and in the presence of zero

the combination generates at its output a signal O, which is fed to the inverse clock input of the counter 8 and switches it to the next state.

The outputs of the counter 8 are the address inputs of the switch 9, and the switch 9 switches the voltage from the input whose address is set to its output. Thus, each input of the switch 9 is mapped to a certain band on the television receiver screen. The output signal of the switch 9 is compared by the comparator 16 with the voltage removed from the output of the digital-analog converter 4. In the comparison, the output of the comparator 16 forms a difference from level O to level 1 which locks the television receiver's video amplifier, which is open at the beginning of the line, and thereby determines the length of the horizontal band. At the same time, the pulse duration at the output of the comparator 16, and hence the length of the band, is proportional to the value of the input analog signal applied to the information input of the switch 9, whose address is currently indicated by the binary code from the outputs of the counter 8. The voltage at the output of the digital-analog converter 4 is generated when a linearly increasing code is fed to its input from the outputs of counter 3, the width of which 1 is chosen based on the accuracy requirements for converting analog signals to pulse duration. A linearly increasing code at the output of the counter 3 is generated when pulses are fed to its clock input of the master oscillator 1, which generates output pulses between the lower-case damping pulses and is in a quiescent mode during the action of the horizontal damping pulse. The frequency of the master oscillator I is chosen in such a way that during the forward course of the horizontal sweep of the television receiver, the counter 3 successively takes all 2 of its states. Counter 3 is zeroed by a lower-case damping pulse at the beginning of each line, which causes a synchronous change in the output code of counter 3 from zero to 2 during each line of the television raster.

The input code of the digital-to-analog converter 4 is stored in register 5 at the time of comparing the input analog signal with the voltage from the output of the digital-analog converter during only the first line of each horizontal band. Writing into register 5 is effected by a pulse from the output of the comparator 16 through the second input of the element AND 15, and the element 15 is open only if there is a level 1 at its first input, which is supported by the element NOT 13, since To the input of the latter, the level O is output from the output of the OR 12 element, when all the zeroes are present at the inputs of the OR 12 element, and the zero combination at the inputs of the OR 12 element corresponds only to the first line of each strip. The output of the element HE 13 supports open and the element AND 14 during the first line of each band, therefore the length of the first line of each band is set by a pulse from the code of the comparator 16 through the element AND 14, the element OR 17 and the pulse shaper 18 for matching with the television receiver's video amplifier. As a rule, signal level matching circuits, such as voltage dividers or buffer amplifiers, are used as pulse generator 18. On all rows of the strip other than the first, level 1 is maintained at the output of the OR 12 element, therefore elements 15, 14 are closed and the pulse from the output of the comparator 16 does not pass to the control

input to register 5, or to the output device. The signal that locks the video amplifier at the end of the band is formed in this case by a comparator.

6 through element AND 7 when comparing the current binary code at the input of the digital-to-analog converter 4 with the stored binary code stored for the entire strip in register 5.

Thus, during the first line of each band its end is determined by analogue comparison, and for all other lines by digital comparison. Since, when digitally comparing, high-frequency minds at the device input do not affect the result of the comparison, the length of all the lines that make up the band.

0

five

five

0

five

0

five

five

strictly the same, which makes it easier for the operator to read the readings.

Claims (1)

Invention Formula A device for forming horizontal stripes on a television indicator screen, comprising a pulse generator, a first counter, a digital-to-analog converter, a first comparator, a pulse generator output connected to the counting input of a first counter, the reset input of which is connected to the master input of the pulse generator and is a horizontal lowering pulse input devices, the outputs of the first counter are connected to the information inputs of the digital-analog converter, the transducer whose output is connected to the first I1 {forma- tional The first input of the first comparator, characterized in that, in order to improve the accuracy of the device, the second and third counters, the first and second elements OR, the switch, the second comparator, the register, the element NOT, the first, second and third elements AND, the pulse shaper are entered into it. , the reset input of the second counter is connected to the reset input of the third counter and is the input of frame damping pulses of the device; the count input of the third counter is connected to the input of the pulse generator; the outputs of the third counter are connected to the inputs of the first IL element And, the output of which is connected to the counting input of the second counter, to the input of the element NOT and to the first input of the first element I, the outputs of the second counter are connected to the address inputs of the switch, the information inputs of which are the information inputs of the device, and the output connected to the second information input of the first a comparator, the output of which is connected to the first inputs of the second and third elements I, the second inputs of which are connected to the output of the element NOT; the information inputs of the register are connected to the outputs of the first counter, and the control The main input is connected to the output of the third element I, the outputs of the register are connected to the first information inputs of the second comparator, the second information inputs of which are connected to the outputs of the first counter, the output of the second comparator is connected to the second input of the first element AND, the output of the first element AND is connected to the first input of the second element OR, the second input of which is connected to the output of the second element AND, the output of the second element AND is connected to the input of the pulse former, the output of which is the output of the device for connecting to the video input of the television indicator. ///////////// W7 //// In ///////. Yo four- U ///////// U7 / A 2 W //// Z / /////  and U //// 7 // ///// 7 // AU  and  comparator Have  and Fie.2