SU1438022A1 - Device for extracting television line signal - Google Patents

Abstract

The invention relates to television. The purpose of the invention is to improve the accuracy of the selection of a tele-: viewing line by eliminating the re-allocation of a signal of an even-field line. The device contains synchronizer 1, selector 2 pulses, fields, blocks of choice 3 and 4 fields and lines, shaper (F) 5 selector pulses, F 6 horizontal sync pulses, switches 7 and 11, divider 8 field pulse frequency by two, F 9 and CH2 blocking pulses and electrodes 10 and 13. When setting switch 1I to position II, the output of the Ф 12 excludes the blocking signal of all horizontal sync pulses of every 2nd even, field. This signal is sent to I-13 and then through switch 11 to I-10, prohibiting the passage through it to the block 4 of one horizontal sync pulse in the 2nd odd field and all the horizontal sync pulses in every 2nd even field . The goal is achieved by the introduction of F 12 and Zl-I 13. 2 Il.

Description

WITH

sh about to | o

srig,

I The invention relates to television and can be used in apparatus for measuring parameters of television systems.

The purpose of the invention is to improve the accuracy of the signal of a television line by eliminating the repeated selection of the signal of an even-field line.

A: FIG. 1 shows a structural electrical circuit of the device; on c) ig.2 - time diagrams, according to his work.

14380222

selected line in the field). At position I of the first switch 7, selector pulses of the Kth row of each odd field are formed at the output of the device; at position II, selector pulses of the Kth row of each even field; at position III, selector pulses of the Kth row of each odd field and the Kth row of each even field.

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The second switch 11 is set to position II. At the same time, the device contains (Fig. 1) sync-) the 5th output of the field selection block 3, sync onizer 1, pulse selector 2, unit 3, field selection block 3, row selection unit 4, shaper pulse selector 5, and 6 horizontal sync pulses , the first switch 20 |) switch 7, the divider 8 of the field pulse frequency following by two, the first driver 9 blocking pulses, the first element AND 10, the second switch 11, the second driver 25 blocking pulses - icH and the second element and 13.

The device works as follows.

The sync selector 1 selects from the PZO; at its input, a full telecom sync signal, from the selector selector 2 field pulses And the shaper 6 horizontal sync pulses of odd fields (Fig. 2c) are input to the divider 8 of the field pulse frequency by two The signal from the output of which (figd) starts the first shaper 9 of the blocking pulses of one horizontal sync pulse in every second odd field, the signal (fig.2e) from the output of which goes to the second: input of the second element And 13. From the first and second output The field selection block 3 synchronous pulses of odd (Fig. 2b) and even (Fig. 2d) fields are fed to the first and second inputs of the second blocking pulse generator 12, at the output of which a blocking signal (Fig. 2g) of the blocking all horizontal sync pulses of every second even sex is generated. The signal (Fig. 2g) after the | 1 pulses are extracted, respectively, is blunt at the first input of the element And 13,

the output signal of which (fig.2z) through the second, switch 11 supplies the saddle signals (fig.2a) and lowercase fig.2b (bin impulses arriving on the inputs of the field selection block 3. On the first, second JPOM and third outputs of the selection block 3 Pop pulses are formed of odd (fig. 2b), even (fig. 2d) and both (fig. 2a) fields, respectively.

The second switch 11 is set to position I. In this case, the operation of the device does not differ from the operation of the prototype. Lower sync pulses from the output of the forcing 6 lowercase sync pulses through the first element 10 and arrive at the second input of the row selector 4, while the first (setting) input of which through the first switch 7 receives field pulses from one of the three outputs of the field selector 3. Block 4 of line selection after each pulse. The field received at its first (installation) input generates a pulse at the output that coincides with Km. horizontal sync pulses (k - number

40

45

50

55

from the first input of the element I 10, prohibiting the passage through it to the second input of the block 4 row selection. one line sync pulse in every second odd field and all line sync pulses in each second even field (fig.2i). At position I of the first switch 7, selector pulses of the Kth row of each first odd field and (K + 1) -th row of every second odd field are formed at the output of the device, at position II - selector pulses of the Kth row of every second even field, with position III - selector pulses of the K-th line of each first odd field. The kth line of each first even field, the (K + 1) -th line of every second odd field, with the K-line of every second even field suppressed (Fig. 2k).

The second switch 11 is set to position II. At the same time, from the first output of the field selection block 3, odd-field clock pulses (Fig. 2b) are fed to the input of the divider 8 of the field pulse frequency by two, the output of which (Fig. 2d) is triggered by the first driver 9 of the blocking pulses of one horizontal sync pulse an odd field, the signal (fig.2e) from the output of which is fed to the second: input of the second element And 13. From the first and second output of the field selection block 3, the odd-clock sync pulses (figv) and even (fig.2d) fields are fed to the first and the second inputs of the second shaper blocking pulses 12, at the output of which a signal is generated (Fig. 2g) of blocking all horizontal sync pulses of every second even field. Signal (fig.2zh) pos0

five

0

five

from the first input of the element I 10, prohibiting the passage through it to the second input of the block 4 row selection. one line sync pulse in every second odd field and all line sync pulses in each second even field (fig.2i). At position I of the first switch 7, selector pulses of the Kth row of each first odd field and (K + 1) -th row of every second odd field are formed at the output of the device, at position II - selector pulses of the Kth row of every second even field, with position III - selector pulses of the K-th line of each first odd field. The kth line of each first even field, the (K + 1) -th line of every second odd field, with the K-line of every second even field suppressed (Fig. 2k).

Claims (1)

Invention Formula A device for signaling a television line, containing a series-connected synchro selector, whose input is the input of the television video signal, a field pulse selector, a field selection unit, a first switch, a line selection unit and a selector pulse generator whose output is the device output as well as the horizontal sync pulse shaper, whose input is connected to the output of the sync selector and the output is connected to the second input of the field selection block, to the first input of the second switch and the first input of the first element is And, the output of which is connected to the second input of the row selector unit, and the second input is connected to the output of the second switch, the frequency divider following two pulses of fields, the input a) n  I-, I no / ie --1} - “-if n Jlfiofle Jl (5j JLJUUl jJUULJU JUUUL ri which is connected to the first output of the field selection block, and the output is connected to the input of the first blocking pulse shaper, characterized in that, in order to improve the accuracy of the television line signal by eliminating the re-selection of the even-field string signal, a second blocking pulse shaper is introduced and the second element And, the first and second inputs of the second blocking device of the blocking pulses are connected respectively to the first and second outputs of the field selection block, the output of the second driver of the pulses is irovki connected to the first input of the second AND gate, a second input coupled to an output of the first lock pulse shaper and vkod second AND gate is connected to the second input of the second switch. n Jlfiofle Jl JTL l " 9и.г.1