GB1337655A - Decoding system for a television receiver - Google Patents
Decoding system for a television receiverInfo
- Publication number
- GB1337655A GB1337655A GB2931271A GB2931271A GB1337655A GB 1337655 A GB1337655 A GB 1337655A GB 2931271 A GB2931271 A GB 2931271A GB 2931271 A GB2931271 A GB 2931271A GB 1337655 A GB1337655 A GB 1337655A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signals
- line
- switch
- demodulator
- fed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/44—Colour synchronisation
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
- Color Television Systems (AREA)
Abstract
1337655 Colour television SONY CORP 22 June 1971 [17 Oct 1970 17 Nov 1970] 29312/71 Heading H4F A decoder for PAL colour television signals utilizes only every second line of chrominance information by use of a one line delay line 2 and switch 4 operated at the end of each line period. As a result all the signals fed to the demodulators 7 and 8 have the same modulation axes, demodulator 8 being fed with a sub-carrier frequency reference signal of B-Y phase, and demodulator 7 being fed with a reference signal coinciding in phase with the burst signals from switch 6 gated out by gate 10. The resulting demodulated signals are matrixed at 18 with the luminance component applied at 19 to produce red, green and blue component signals. The B-Y reference signal is produced by averaging the burst phases in the incoming signal to give a signal of -(B-Y) phase which is inverted at 17. In an alternative embodiment the delay 2 is provided after the switch 4, the switch passing every second line and burst gate 10 and each demodulator being connected to the switch output directly and via the delay line. Alternatively, switch 4 may be replaced by a diode witch (22, Fig. 7, not shown) which has two outputs one producing chrominance signals with positive B-Y and R-Y modulation axes and the other signals having positive B-Y and negative R-Y modulation axes. Burst gate 10 and demodulator 7 are then fed from one of these outputs and demodulator 8 from the other output. In a further embodiment the chrominance signals are demodulated along the R-Y and B-Y axes by adding the outputs from continuous wave generators 11 and 15 in the correct proportions to give a signal along the R-Y axis, which is then used to control the oscillator 12. Delay line 2 may have a delay of an odd multiple of one line period.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9133470A JPS502209B1 (en) | 1970-10-17 | 1970-10-17 | |
JP10128470A JPS502327B1 (en) | 1970-11-17 | 1970-11-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1337655A true GB1337655A (en) | 1973-11-21 |
Family
ID=26432786
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2931271A Expired GB1337655A (en) | 1970-10-17 | 1971-06-22 | Decoding system for a television receiver |
Country Status (14)
Country | Link |
---|---|
AT (1) | AT328525B (en) |
AU (1) | AU454095B2 (en) |
BE (1) | BE769986A (en) |
CA (1) | CA951013A (en) |
CH (1) | CH540620A (en) |
DE (1) | DE2138826C3 (en) |
ES (1) | ES393362A1 (en) |
FI (1) | FI57333C (en) |
FR (1) | FR2112305B1 (en) |
GB (1) | GB1337655A (en) |
IE (1) | IE35586B1 (en) |
NL (1) | NL173008C (en) |
NO (1) | NO140782C (en) |
SE (1) | SE373016B (en) |
-
1971
- 1971-06-22 GB GB2931271A patent/GB1337655A/en not_active Expired
- 1971-06-22 SE SE809171A patent/SE373016B/xx unknown
- 1971-06-23 FI FI179271A patent/FI57333C/en active
- 1971-07-14 BE BE769986A patent/BE769986A/en not_active IP Right Cessation
- 1971-07-14 NO NO270071A patent/NO140782C/en unknown
- 1971-07-16 ES ES393362A patent/ES393362A1/en not_active Expired
- 1971-07-19 FR FR7126382A patent/FR2112305B1/fr not_active Expired
- 1971-08-03 DE DE19712138826 patent/DE2138826C3/en not_active Expired
- 1971-08-18 AT AT720571A patent/AT328525B/en not_active IP Right Cessation
- 1971-08-30 CH CH1270471A patent/CH540620A/en not_active IP Right Cessation
- 1971-09-01 IE IE111471A patent/IE35586B1/en unknown
- 1971-10-13 AU AU34517/71A patent/AU454095B2/en not_active Expired
- 1971-10-14 CA CA125,135,A patent/CA951013A/en not_active Expired
- 1971-10-18 NL NL7114293A patent/NL173008C/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ES393362A1 (en) | 1973-09-16 |
AU454095B2 (en) | 1974-10-17 |
BE769986A (en) | 1971-11-16 |
AU3451771A (en) | 1973-04-19 |
DE2138826C3 (en) | 1978-06-01 |
NL173008C (en) | 1983-11-16 |
SE373016B (en) | 1975-01-20 |
IE35586B1 (en) | 1976-03-31 |
DE2138826A1 (en) | 1972-04-20 |
DE2138826B2 (en) | 1977-08-11 |
FR2112305A1 (en) | 1972-06-16 |
FR2112305B1 (en) | 1976-09-17 |
IE35586L (en) | 1972-04-17 |
NL173008B (en) | 1983-06-16 |
ATA720571A (en) | 1975-06-15 |
FI57333C (en) | 1980-07-10 |
NO140782B (en) | 1979-07-30 |
CH540620A (en) | 1973-08-15 |
NL7114293A (en) | 1972-04-19 |
AT328525B (en) | 1976-03-25 |
FI57333B (en) | 1980-03-31 |
NO140782C (en) | 1979-11-07 |
CA951013A (en) | 1974-07-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |