SU664313A1 - Television system - Google Patents

Description

The invention relates to the field of Special and Broadcast Television and can be used in the development of compatible color television with enhanced image quality. A television system is known that has a color television signal sensor on the transmitting side, the blue signal output of which is connected via the first balanced modulator to the first input of the adder, the second input of which is connected to the output of the first amplitude modulator, and the other input of the first balanced modulator is connected to the first output of the subcarrier generator The second output of which is connected to the input of the second amplitude modulator through the first phase-shifting circuit, the output of which is connected to the third input of the adder, four Its third input is connected to the second balanced modulator, the first input of which through the second phase-shifting circuit is connected to the output of the first phase-shifting circuit, and the second input through the first phase inverter to the output of the red sensor of color television signals, which is connected through the third balanced modulator to the fifth the input of the adder, the output connected to the amplifier: high frequency glue, additional carrier generator, on the receiving side - a frequency converter connected to the input of the intermediate frequency amplifier, first The first output of which is connected to the video detector, and the second output through the first controlled filter connected in series, the first and intermediate frequency generator to the first synchronous detector, the second input of which is connected to the second input of the second synchronous detector and c. the second output of the intermediate frequency amplifier, while the outputs of both synchronous detectors are connected to the inputs of the first adder 1. The disadvantage of this television system is reduced image clarity and the absence of colors in small parts, which reduces the image quality. The purpose of the invention is to improve the quality of the transmitted and received images. To do this in a television system containing on the transmission side. A sensor of color television signals, the blue signal output of which is connected via the first balancer module to the first input of the adder, the second input of which is connected to the output of the DS) (the first modulator of the Split6 / other input of the first balanced modulator is connected to the first output of the subcarrier generator, the second the output of which through the first phase-shifting circuit is connected to the input of the second amplitude modulator, the output of which is connected to the third input of the adder, the fourth input of which is connected to the second balanced modulator, the first The second KOTopoiro through the second phase-shifting circuit is connected to the output of the first phase-shifting circuit, and the second input through the first phase inverter to the output of the red sensor signal of the color TV signal, which is connected through the third balanced 1U1 module to the fifth input 6 e; with a high-frequency amplifier, a dbpblnitelnaya carrier generator, on the receiver with a frequency converter, connected to the input of the intermediate frequency amplifier, the first output of which is connected to the video detector, and the second output through the last This is the first controlled signal that generates the first intermediate frequency with the first synchronous detector, the second input is connected to the second input of the second synchronous detector, and the second output of the intermediate frequency amplifier, while the outputs of both synchronous detectors are connected to the inputs of the first adder, the output The signal intensity of the color television signal sensor is connected via the inputted second phase inverter with the first inputs of the first and second amplitude modulators; the second input of the first .amplitude The modulator is connected via a third fa- cespeed circuit to a generator and an additional output, the output of which ifO is connected to the fourth balanced modulator input, the output of which is connected to the sixth input of the adder, and the other input through the input of the third phase inverter to the output signal. colored telSHSHN signals, the second input of the perimeter aMtiJlMTy Hbro modulator is connected to the output wires; fourth phase-shifting circuit with DRUG1Sh input of the third balancer, on the receiving side the second output of the intermediate frequency amplifier is connected Through the second connected and sequentially connected second controlled filter and second intermediate generator to the input of the second synchronous detector whose output is through the input of the second synchronous detector connected to the second input Su F Atbrom, another input of which is connected to the output of the first synchronous detector, and the output to the first input of the input matrix of the green signal, the second input of which is connected nen with output of the first adder. The drawing shows a structural electrical circuit of the described television system. The television system contains on the overeating side a sensor 1 of color television signals, the output 2 of the blue signal of which is connected through the first balanced modulator 3 to the first input of summatr 4, the first amplitude modulator 5, the generator 6 up existing, the first phase-shifting circuit 7, the second amplitude modulator 8, the second balanced modulator 9, the second phase-shifting circuit 10, the first phase-shifter. an inverter 11, the input of which is connected to the output 12 of the red sensor signal 1 color television signals jBoB, the third balanced modulator 13, the high-frequency amplifier 14, the additional generator 15 additional 5 LEDs, on the receiving side - the frequency converter 16, the intermediate frequency amplifier 17, in the ID 18 , control unit filter 19, generator. 20 First Intermediate Frequency, First Detector 21, Second Synchronous Detector 22, First Adder 23, and also on the transmitting side of Gucd 24, J Signal intensity of the sensor 1 Schottler; 1 Stroke Signal, UFLURNAL 4 Phase-Invor Tor 25 With First-Chélord, first-of-the-first-quarter signals of the Phase Inverter 25 with the first signal; modulator 5, the third phase-shifting circuit 26, the fourth balanced,. the modulator 27, the third phase 28, the fourth phase-shifting circuit 29, and on the receiving side - a controllable filter 30, a governor 31 is the third frequency, a second frequency, a third signal, and a green signal matrix 34. Television; the system works with L (e); subcarrier generator 6 produces a subcarrier frequency oj. These oscillations are through the first phase shift & 7 (4p 45 °) nbcT naiOr oscillator on / off the amplitude modulator 8. Simultaneously, the carrier generator 8 connected directly to the front balanced modulator 3, to the second input of which the output 2 of the blue signal is connected (HZts). After the first phase-shifting circuit 7 there is the same second fa- dBD junction circuit 10 (c 45 °) and its output is connected to the second balanced blower 9 whose second entrance is from output 12 of the red signal through the first fd13 inverter 11 delivers the signal ts. the generator 15 is an additional carrier; similarly, through the retract, the phase-shifting circuit 26 is connected to the first amplitude module 5, the input of which receives a signal from the output 24 of the luminance signal y in negative polarity

the second phase inverter 25. The oscillations with the frequency directly from the generator 15 of the additional carrier are delivered to the fourth balanced modulator 27, to the input of which goes through the third phase inverter 28. the blue signal in negative polarity Ug. The third phase-shifting circuit 26 is connected to the same fourth phase-shifting circuit 29 (h.). Thus, the third balanced modulator 13 oscillates at a frequency co. That is shifted by 90 relative to the oscillations arriving at the four-way turn-on modulator 27. The second input of the third balanced moto- tor 13 receives a red signal from sensor 1 () . Balance modulators 3,9,13,27 and amplitude 1 modules 8 and 5 are connected to adder 4, the role of which can be a filter that forms a symmetrical amplitude-frequency characteristic, adder 4 is connected to a high-frequency amplifier 14. From the converter ItJ frequency signal is fed to the input of the amplifier 17 intermediate. frequencies. This amplifier has a symmetric amplitude-frequency characteristic with respect to two carrier frequencies bJ ,, and uij. The signal from the amplifier input 17 of the intermediate frequency is fed to the video detector 18 and controlled filters 19 and 30 (controlled by line synchronizing pulses), which are connected to the generators 20 and 31 of the intermediate frequencies, respectively. The outputs of the generators 20 and 31 are connected to synchronous detectors 21 and 22, to the second inputs of which a signal is supplied from the intermediate frequency amplifier 17. You: the tracks of the synchronous detectors 21 and 22 are connected to the first adder 23, at the output of which a color contrast signal () is formed. The output IBTOpqfo of the synchronous detector 22 is black. The inverter 32 is connected to the second adder 33, to which the first synchronous detector 21 is connected. At the output of the second adder 33 a color difference signal (Ug -Uy) is formed. In the green signal matrix 34, a color difference signal (C, -Ify) is formed. The output of the video detector 18 is a luminous signal Uy.

. The essence of the described television system is explained by the following reasoning.

The total signal formed in adder 4 with regard to filtering sidebands can be represented as a sum, cos (uj, tH 5 ° H f UgKcosfuj, SJ g) t-UYCx3stC, + aH + 45 -aUgKSif. (U) + "" And +

+ UjCc (402t t45) -2 u KCOs (uJ2-S2gH + 4 | UgK6 n (io -S2gH-7TJYCDs (t02-SiH-4S ° J. Fl)

The signal contains information about both carrier frequencies (and uJj (the first and the first three terms). In the receiver, common: signal (1) in the first synchronous; detector 21 multiplied by binui t. At the output of the first synchronous detector 21, taking into account the filtering of high-frequency components takes place

V (tV6iriJ, t -ySin45-C UgK-sin5lgtt UYSin (SJt + 4S -fflUg-K-co & fi, t- -sinBu) 2-uJ) U45% K-sinM ,,

(Shg-i1, - g H + Eu1nO, (02-H-5 H + 5 f 2)

In the second synchronous detector 22, the signal (1) is multiplied by sinWit

; ifo (t) -sin u) jt) 2-i iH-45Ji-mUe Cip (Cb), - 5 Hz) t-EuY-6in iw2-W, -flH-45 ° j-2 Ug- K-co6 (. .NAS -fflUg.K-iin 5Jgt + EUgKCtJsSigt (3)

("1-45.).

In the adder 23, the signal yt) -ys-fflu.K- & inSi is generated: t Uj, K-5inM2- r e

+ W- (2 u COS "t-cob (UJ2-H) H V2-UYCDS (Wj-uJ, -") t.,

(

Here, Uj U 0 is accepted. This expression is a color difference signal (Ug-Uy) with a constant component. The difference frequency u) j-Wj carries the same signal. But for simplicity, it is enough to put a rejection filter tuned to the difference frequency tJjM at the output of the synchronous detector, as in the capacitive channel

) .K-binft t + mV2UyCos t. (S)

In order for the second and third terms to represent the usual color difference signal (it-g) g is necessary. MO to x j OJ08.

In the inverter 32, the phase constituting the expressions (3) is reversed. In the adder 33, taking into account the notch filter (ujj-ui), there is

Uj2 pW-§yjK-cos "gtfmV2UySin" t, (6) i.e. color difference signal - ()

55

Claims (1)

Invention Formula A television system comprising a color television signal sensor on the transmitting side, the blue signal output of which is connected via the first balanced modulator to the first input of the adder, the second input of which is connected to the output of the first amplitude modulator, the other input of the first balanced modulator is connected to C p & the generator output was offered by Um, the second output kbto | horn6 through the first phase-shifting circuit is connected to the input of the second amplitude modulator, the output of which is connected to the third input of the adder, the fourth input which is connected to the second balanced modulator, the first input of which through the second phase-shifting circuit is connected to the output of the first phase-shifting circuit, and the second input through the first phase inverter to the output of the red color television signal sensor, which is connected to the fifth adder via the third balanced modulator connected to a high-frequency amplifier; additional carrier; on the receiving side, a frequency converter connected to the input of the intermediate-frequency amplifier; first output The second output is connected in series with the first controlled filter, the first intermediate frequency generator to the first synchronous detector, the second input of which is connected to the second input of the second synchronous detector and to the second output of the intermediate frequency amplifier, while the outputs of both synchronous detectors connected to the inputs of the first adder, characterized in that, in order to improve the quality of the transmitted and received images, the output of the luminance signal of the color television sensor Ion signals are connected via the inputted second phase inverter to the first inputs of the first and second amplitude modulators, the second input of the first amplitude modulator is connected via the third phase-shifting circuit to the first output of the additional carrier generator, the second output of which is connected to the fourth balance modulator, the output of which is connected to the sixth input of the adder, and the other input through the entered third phase inverter - with the output of the blue sensor signal of color television signals, the second input of the first amplitude This modulator is connected via a fourth phase phase to another input of the third balanced modulator. On the receiving side, the second output of the intermediate frequency amplifier is connected via a second controlled frequency filter and a second intermediate frequency generator input and series connected to the second synchronous detector, the output of which through the entered inverter is connected to the entered second adder, the other input of which is connected to the output of the synchronous detector, and the output - c. the first input of the input matrix of the green signal, the second input of which is coi dinene with the output of the first adder. Sources of information taken into account in examination 1. Application No. 2135448/09, class No. 04/93/95/19.05.75 That decision on the vnadache copyright certificate.