SU1589428A1 - Device for conversion of television standard - Google Patents

Abstract

The invention relates to television technology. The purpose of the invention is to increase the information content of the image. A device for converting a television standard contains a small-frame television camera 1, ADC 2, block 3 of buffer memory, block 4 of memory, DAC 5, video control block 6, counters 7, 8, 10 and 11 pulses, generators 9 and 14 sync pulses, block 12 comparing codes, element 13, a divider 15 of the frequency of a pulsed packet, shaper 16 control pulses, an element of OR 17, a distributor of 18 lines, and generators 19 and 20 of pulse packets. The goal is achieved by scaling the selected fragment. 1 il.

Description

The invention relates to television technology and can be applied in low-frame tehI-effective systems,

The aim of the invention is to increase the information content of the image by large-scale transformation of the selected fragment.

The drawing shows a structural electrical circuit of a device for transforming a television statodart.

A device for converting a television standard (Fig. 1) contains a small-frame television (TV) camera 1, an analog-to-digital converter () 2, a buffer memory block 3, a memory block 4, a digital-analog converter (PDP) 5 and a video control block ( WKB) 6., per Bbffl and second counters 7 and 8 pulses, first generator 9 sync pulses, third counter 10 pulses, fourth counter 1.1 pulses, block 12 comparison of codes, element K 13, | Second generator 14 sync pulses, divider 15. pulse frequency packs, for Schrovel 16 control | pulse 6c, Hilti element 17, distribution | numerator 18 lines, nepiBbin and second generators 19 and 20 pulse bursts. ; The device works as follows.

I During the forward run of the lowercase unwinding of the broadcast standard, unit 4 is set by a signal from the third output of the first generator 9 sync pulses to read mode. In this mode, block 4 is addressed by a second counter 8. Each field synchronization pulse loads into the second counter 8 an initial read address of this field, which arrives at the second counter 8 from the generator 16. In the case where the display scale on the VBB screen 6 is selected 1 : 1, the starting addresses are the addresses of the placement in block 4 of the digital equivalents of the signals of the first elements of each field. When a fragment is displayed at a given scale, the initial addresses become addresses containing information about the signal of the initial element of the selected fragment in each field. Gender is identified on the basis of a check for XI and FID matching on the second and

0

S

0

five

0

five

0

five

0

five

the first inputs of the second counter 8 from the fourth and first outputs of the first generator 9 clock pulses .. Cyclic setting of the start address ensures that the information in each frame is identical.

During the forward stroke of the lines of the active part of the frame, the input of the direct account (fifth input) of the second counter 8 is received through the WIT element 17 and the divider 15 of the impulse rate frequency, clock pulses generated in these time intervals at the second output by the first generator 9 clock pulses. The number of clock pulses in a pack is selected on the basis of the condition that 4 digital equivalents of all elements contained in a line of a full-format television device are derived from a block.

In the case when the scale of display on the screen of VKB 6 is 1: 1, shaper 16 sets the division ratio of divider 15 of the pulse bundle frequency to one and sets the distributor 18 lines, the first generator 19 of the pulse packs and the second generator 20 of the pulse packs in the neutral (non-working) state the As a result, only the bundle formed by the first generator 9 clock pulses affects the input of the direct counting of the second counter 8, without any changes during the passage of the pulse pack frequency through the divider 15 and the OR element 17. There is no signal at the output of the counting counter of the second counter 8. Each clock pulse at the input of the direct counting increases the number currently existing in the second counter 8 by one, thus realizing the reading of information from the next cell of block 4. Thus, in this mode, digital equivalents of signals are output from block 4 all elements of the line of single-frame TV. camera 1.

At the same time, the analog-to-digital converter 2 samples in time and amplifies the video signal of a small-frame television camera 1 inputted to the analog-digital converter 2 by amplitude. The half-code from the first output of the analog-digital converter 2 is transmitted to the first input-unit 3 and is stored in one of the cells of this block. At the end of the quantization of the first sample of the video slot from the second output of the analog-digital converter 2 to the input of the third counter 10, a pulse arrives, which takes it to the next state. In this case, the third counter 10 enters in block 3 already the address of the next cell, into which the amplitude of the next sample of the video signal of the low-frame system is recorded in digital form. Thus, in block 3, codes, corresponding to the amplitudes of the video signal from 1 image points sequentially scanned by a small-frame television camera, are accumulated, and the third counter 10 stores the number corresponding to the number of video signal samples converted into a code. At this time, the third input of the element I 13 prohibits the signal from the third output of the first generator of 9 clock pulses, therefore the clock pulses from the input of element II 13 do not pass to its output. The states of the first and fourth counters 7 and 11 are unchanged.

After the end of the direct horizontal sweep of the television broadcast standard, a signal appears at the third output of the first generator 9 clock pulses that puts unit 4 in recording mode. In this mode, it is addressed by the first counter 7. At the first input of the splitter 15 of the bundle frequency, and hence at the direct count input of the second counter 8, during the return stroke, there are no clock pulses. This prevents any changes in the state of the counter 8 in the considered period of time.

The constancy of the state of the second counter 8 at the time of the return stroke of the line of the broadcast standard is characteristic for the case of display on a scale of 1: 1. When choosing a different scale, the dispenser of 18 lines, the first and second generators of 19 and 20 pulse packs take part in the operation of the device. This leads to the appearance of additional bursts of clock pulses at the inputs of the forward and reverse counts of the second counter 8 during the return stroke of the line of the broadcasting standard and, therefore, to a change in its state.

15

589428

ten

At the input of the element And 13 comes from the first generator 9 clock pulses the enable signal. If during the forward run of the broadcast standard line one or several image points are recorded in block 3, the codes stored in the third and fourth counters 10 and 11 are different from each other, therefore the input of element P 13 from block 12 is received enable signal. Since the resolving signal is also present at the input of the AND 13 element, the clock pulses J5 from the output of the second generator 14 clock pulses through the AND 13 element arrive at the input of the first and fourth counters 7 and 11. Since the block 4 is in recording mode, the pro the information is copied from block 3 to block 4. At the same time, the code from block 3, to which the first bit was recorded during the forward stroke of the line 25 of the television broadcast standard, is first written over. All the information accumulated in block 3 has time to rewrite to block 4 in a time less than or equal to the duration of the return stroke of the display line 30. When a new video sample of a small-frame television camera 1 is created, overwriting information is temporarily suspended. An entry is made in block 3 of the buffer memory of the newly received code, after which the rewriting is resumed. Overwriting is stopped when the third and fourth counters 10 and 11 have the same codes. In this case, the resolving signal is removed from the input of element 13. After the end of the return stroke of the TV broadcast standard line, block 4 returns to readout, the third and quarter of the frequency counter counters 10 and 11 are set to zero. The PS of block 4 outputs the cylindrical equivalents of the signals of all samples of the next row of a low-frame television camera 1..

35

40

45

50

, In the case when the standard conversion is performed for an arbitrarily selected fragment of the image and the display scale on the screen of VKB 6 differs from unity, the process of recording video signal samples

. small-frame camera t in block 3, as well as rewriting accumulated in it

eight

the information in block 4 is carried out in a similar way.

The process of reading information from block 4 to be displayed on the screen of the VCB 6 in this case proceeds with a significant difference. The shaper 16 sets in the divider-15 the frequencies of the pulse wad of the division factor corresponding to the horizontal scale factor K factor. This leads to a thinning by the divider 15 formed at the second output of the first generator 9 clock pulses. As a result, the packet of clock pulses, acting through the OR element 17 on the direct count input of the second counter 8 during the forward run of the broadcast standard line, contains K fewer pulses. Thus, in the forward run, the display lines from block 4 are successively displayed K times less than

15

20

The displayed line of the displayed fragment is performed by supplying the broadcasting standard to the counting input (third input) of the second counter 8 packs of clock pulses from the second generator of 20 pulsed packets during the reverse stroke. The number of pulses in a burst should be equal to the number of addresses read in block 4 while the fragment string is displayed. It is formed by shaper 16 and is fed into pulse generator 20 through its second input. The lines in front of which in the second counter 8 must be restored the starting address of the current line is identified by feeding to the first input of the second generator 20 pulsed packets of the horizontal gassing pulse from the second output of the distributor 18

lines.

The hopping operation of the address is increased in the second counter 8 of the implementation i3bJ13U / l, ll AL-L o l f.t- - honestly digital equivalents of samples 25 is due to the feed during the reverse i "iH.Hin f m rn an dnt 9 TTTbUOT /

video signal of a small-frame television camera 1. This, in turn, means that on the screen of VBB 6 each output from block 4 the element is stretched horizontally K times. The start read address in each field, as already mentioned, is the address containing the digital equivalent of the starting element of the displayed fragment. Consequently, .--,

The battle in each field will begin (35 ke ke of the camera) and the number of elements with the first element of this fragment. in the line of the displayed fragment.

It is calculated by the former.

The TV standard line at its input for the direct counting of clock pulses from the first generator is 19 pulsed packs through an ISH element 17. The number of clock pulses in a burst must be equal to the difference between the number of samples of a video signal from a small-frame television camera 1 during its line ( the number of elements in the article

The implementation of the vertical scaling is associated with the need to repeat on the screen of WKB 6 information of the same line the necessary number of times. This means that before re-displaying the line, the address of its beginning must be restored in the second counter 8. On the other hand, after the vertical scale-conditioned number of repetitions, a jump-like increment of the readout address should be implemented, providing a transition from the final address of the current line of the fragment to the initial address of its next line. This ensures that at the beginning of each new row, the element belonging to the initial column of the selected

fragment.

The restore operation in the second counter 8 of the start address is repeated 16 and the generator 1 of the pulse bursts is entered into the nepBbrfi through its second

0 entry The lines before the forward run of which in the second counter 8 should be made an abrupt increase in the address are identified by giving to the first input of the first generation

5 tori 19 pulse packs of the lowercase extinguishing pulse from the first output of the distributor 18 lines.

The dispenser of 18 lines distributes the lowering damping pulses containing 50 pulses of the signal received from the third output of the first generator 9 Extinguishing mixture between the first inputs (start inputs) of the generators 19 and 20 of the shsulny packs. Ra

55, the distribution is carried out on the basis of the information on the vertical scaling factor recorded by the shaper 16. Each with a pulse of tv fields

eight

0

five

0

The displayed line of the displayed fragment is performed by supplying, during the return stroke, the line of the television broadcast standard to the counting input (third input) of the second counter, 8 bursts of clock pulses from the second generator 20 pulsed packs. The number of pulses in a burst should be equal to the number of addresses read in block 4 while the fragment string is displayed. It is formed by shaper 16 and entered into generator 20 of pulsed packs through its second input. The lines before the forward run in which the starting address of the current line is to be restored in the second counter 8 are identified by feeding to the first input of the second generator 20 pulsed packets of horizontal gassing pulses from the second output of the distributor 18

lines.

The step of incrementing the address in the second counter 8 is accomplished by sending it at the time it calls back by giving the "iH.Hin f m rn an DOnt 9 TTTbUOT /

, .--,

The TV standard line at its input for the direct counting of a clock pulse packet from the first generator is 19 pulse packets via an ISH element 17. The number of clock pulses in a packet must be equal to the difference between the number of video sample samples of a low-frame television camera 1 during the decomposition line is calculated by the former

16 and is brought into the nepBbrfi generator 19 pulse packs through its second

entrance. The lines before the forward run which in the second counter 8 must be jumped up are identified by feeding to the first input of the first generator 19 pulsed packets of the horizontal extinguishing pulse from the first output of the distributor 18 lines.

The distributor 18 lines distributes the lowering damping pulses contained in the signal received by the third output of the first generator 9 pulses of the damping mixture between the first inputs (start inputs) of the generator-. tors 19 and 20 shsulny packs. The distribution is made on the basis of the information on the vertical scaling factor recorded by the shaper 16. Each syi-sync pulse of the TV broadcast standard fields, coming from the fourth output of the first generator 9 sync pulses to the second input of the 18-row distributor, performs a cyclic initial setting of the latter. The WKB 6 unit is synchronized by horizontal synchronizing pulses and field pulses produced by the generator 9 of clock pulses.

Claims (1)

Formula invented the shadows A device for converting a television standard that contains a series-connected small-frame television camera, an analog-to-digital converter (ADC), a buffer memory block, a memory block, a digital-to-analog converter (D / A converter), and a video control block (WKB), the first input of which is connected the input of the second pulse counter and the first output of the first clock generator, the second output of which is connected to the first input of the AND element and the second input of the memory unit, is connected to the third and fourth inputs The outputs of the first and second pulse counters, the third pulse counter, the input of which is connected to the second output of the ADC, and the output connected to the second input of the buffer memory unit and the first input of the comparator, to the third input of which the second input of the comparator and the output of the fourth pulse counter , the input of which is connected to the input of the first pulse counter and the output of the element I, to the second and third inputs of which are connected respectively to the output The unit of comparison and the second clock generator, characterized in that, in order to increase the information content of the image by large-scale transformation of the selected fragment, the frequency divider of the pulse pack, the first input of which is connected to the third output of the first clock generator, the row distributor, the first and second inputs of which are connected respectively with the BToptiM and the fourth outputs of the first clock generator, which is connected, also with the second input of the second pulse counter and the third input KB, two impulse pack generators, NLP element and control-pulse former, the first to fifth outputs of which are connected respectively to the third input of the second pulse counter, the first input of the second generator of impulse packs, the first input of the first distributor of impulse packs, the third input of the distributor rows and the second input of the frequency divider of the pulse pack, the output of which is connected to the first input of the OR element, to the second input thirty the output of the first generator of pulse packs is connected, the second input of which is connected to the first output of the row distributor, the second output of which is connected to the second input of the second 25 generator of pulse packs, the output of which is connected to the fourth input of the second pulse counter, the fifth input is connected to the output element Iirai, while the second output of the first clock generator is connected to the second input of the DAC. 40