SU452114A3 - Quadrature demodulation device for color signals - Google Patents
Quadrature demodulation device for color signalsInfo
- Publication number
- SU452114A3 SU452114A3 SU1821076A SU1821076A SU452114A3 SU 452114 A3 SU452114 A3 SU 452114A3 SU 1821076 A SU1821076 A SU 1821076A SU 1821076 A SU1821076 A SU 1821076A SU 452114 A3 SU452114 A3 SU 452114A3
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- line
- color signals
- quadrature demodulation
- demodulation device
- signal
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N11/00—Colour television systems
- H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
- H04N11/12—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only
- H04N11/14—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system
- H04N11/16—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system the chrominance signal alternating in phase, e.g. PAL-system
- H04N11/165—Decoding means therefor
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
- Color Television Systems (AREA)
Description
1one
Изобретение относитс к устройствам дл квадратурной демодул ции цветовых сигналов.This invention relates to devices for quadrature demodulation of color signals.
Известны демодул торы дл телевизион ных приемников системы РА .содержащие квадратурный демодул тор, переключатель, генератор цветовой поднесущей, линии задержки и фазовращатель.Demodulators for PA receivers of the PA system are known. They contain a quadrature demodulator, a switch, a color subcarrier generator, delay lines and a phase shifter.
Однако такие устройства имеют сложную конструкцию.However, such devices have a complex structure.
Цель изобретени - упрощение устройства .The purpose of the invention is to simplify the device.
Это достигаетс тем, что в предлагаемо устройство введен перекрестный переключатель , один полюс которого соединен с выходом , а другой - с выходом линии задержки .This is achieved in that a cross-over switch is introduced into the device, one pole of which is connected to the output and the other to the output of the delay line.
На чертеже показана блок-схема предлагаемого устройства.The drawing shows a block diagram of the proposed device.
На клемму 1 подаетс демодулируемый сигнал цветности РА . На квадратурный демодул тор 2 через переключатель 3 подаетс управл ющий сигнал от осцилл тора цветовой поднесущей частоты либо непос .редственно, либо после коммутации переключател 3 фазовращателем 5 со сдвигом |A demodulated PA chroma signal is applied to terminal 1. Through the switch 3, the quadrature demodulator 2 is supplied with a control signal from the color subcarrier frequency oscillator either directly or after switching the switch 3 with a phase shifter 5 with a shift |
по фазе на 9О . При способе РА , также в одной строке транслируетс квадратурно- модулированный цветовой сигнал. В следу- ющей строке транслируетс составл1поща in phase at 9O. With the PA method, a quadrature modulated color signal is also broadcast on one line. The next line broadcasts
-У с обратным знаком. Первые строки в дальнейшем названы строки А, а строки с обратной по пол рности составл ющей строки В .- Do with the opposite sign. The first lines are hereinafter referred to as lines A, and the lines with the inverse polarity of the component of line B.
Переключатель попеременно переключаетс от строки к строке, и сигнал цветовой поднесущей частоты подаетс на квадратурный демодул тор с такой фазой, что во врем строк А демодулируетс и по вл етс : на выходе демодул тора составл юща -У, а во врем строк В - сигнал В-У. Во врем строк А видеочастотный демодулированный сигнал -У подаетс через перекрес.-тный переключатель 6 непосредственно на выходную клемму 7. Одновременно этот сигнал посылаетс на линию задержки и запоминаетс в ней.The switch alternately switches from line to line, and the color subcarrier frequency signal is fed to a quadrature demodulator with such a phase that during line A it is demodulated and the signal appears at the output of the demodulator, and during line B the signal B - u. During lines A, the video demodulated signal -A is transmitted through the crossover switch 6 directly to the output terminal 7. At the same time, this signal is sent to the delay line and stored in it.
Во врем той же самой строки А накопленный в линии 8 задержки во врем преDuring the same line A accumulated in the delay line 8 during the pre
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2141886A DE2141886C3 (en) | 1971-08-20 | 1971-08-20 | Method for quadrature demodulation of PAL color television signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU452114A3 true SU452114A3 (en) | 1974-11-30 |
Family
ID=5817356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU1821076A SU452114A3 (en) | 1971-08-20 | 1972-08-18 | Quadrature demodulation device for color signals |
Country Status (13)
| Country | Link |
|---|---|
| JP (1) | JPS4830820A (en) |
| AT (1) | AT334434B (en) |
| AU (1) | AU471051B2 (en) |
| BE (1) | BE787696A (en) |
| DE (1) | DE2141886C3 (en) |
| ES (1) | ES405934A1 (en) |
| FR (1) | FR2150365B1 (en) |
| GB (1) | GB1391549A (en) |
| IT (1) | IT963616B (en) |
| NL (1) | NL7210673A (en) |
| SE (1) | SE381391B (en) |
| SU (1) | SU452114A3 (en) |
| ZA (1) | ZA724948B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53133325A (en) * | 1977-04-27 | 1978-11-21 | Hitachi Ltd | Pal-system color demodulation circuit |
| JPS5426266A (en) * | 1977-07-29 | 1979-02-27 | Ishikawajima Harima Heavy Ind Co Ltd | Automatic sheet gauge controlling method for rolling mill |
-
1971
- 1971-08-20 DE DE2141886A patent/DE2141886C3/en not_active Expired
-
1972
- 1972-07-12 AT AT598872A patent/AT334434B/en not_active IP Right Cessation
- 1972-07-18 ZA ZA724948A patent/ZA724948B/en unknown
- 1972-07-31 AU AU45129/72A patent/AU471051B2/en not_active Expired
- 1972-08-01 IT IT27731/72A patent/IT963616B/en active
- 1972-08-03 NL NL7210673A patent/NL7210673A/xx not_active Application Discontinuation
- 1972-08-15 SE SE7210600A patent/SE381391B/en unknown
- 1972-08-17 GB GB3839272A patent/GB1391549A/en not_active Expired
- 1972-08-18 SU SU1821076A patent/SU452114A3/en active
- 1972-08-18 BE BE787696D patent/BE787696A/en unknown
- 1972-08-18 FR FR7229590A patent/FR2150365B1/fr not_active Expired
- 1972-08-18 ES ES405934A patent/ES405934A1/en not_active Expired
- 1972-08-22 JP JP47083576A patent/JPS4830820A/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE2141886B2 (en) | 1975-02-13 |
| GB1391549A (en) | 1975-04-23 |
| ATA598872A (en) | 1976-05-15 |
| AT334434B (en) | 1976-01-10 |
| SE381391B (en) | 1975-12-01 |
| AU4512972A (en) | 1974-02-07 |
| FR2150365B1 (en) | 1978-10-27 |
| NL7210673A (en) | 1973-02-22 |
| JPS4830820A (en) | 1973-04-23 |
| FR2150365A1 (en) | 1973-04-06 |
| DE2141886A1 (en) | 1973-03-01 |
| ES405934A1 (en) | 1975-07-16 |
| AU471051B2 (en) | 1976-04-08 |
| IT963616B (en) | 1974-01-21 |
| DE2141886C3 (en) | 1975-09-11 |
| BE787696A (en) | 1973-02-19 |
| ZA724948B (en) | 1973-04-25 |
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