GB1092455A - Improvements relating to colour television systems and receivers therefor - Google Patents
Improvements relating to colour television systems and receivers thereforInfo
- Publication number
- GB1092455A GB1092455A GB3211467A GB3211467A GB1092455A GB 1092455 A GB1092455 A GB 1092455A GB 3211467 A GB3211467 A GB 3211467A GB 3211467 A GB3211467 A GB 3211467A GB 1092455 A GB1092455 A GB 1092455A
- Authority
- GB
- United Kingdom
- Prior art keywords
- components
- phase
- burst
- subcarrier
- line
- 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
- H04N9/00—Details of colour television systems
- H04N9/44—Colour synchronisation
- H04N9/455—Generation of colour burst signals; Insertion of colour burst signals in colour picture signals or separation of colour burst signals from colour picture signals
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
1,092,455. Colour television. TELEFUNKEN PATENTVERWERTUNGS G.m.b.H. Nov. 26, 1964 [March 13, 1964, No. 32114/67. Divided out of 1,092,454. Heading H4F. In a P.A.L. system the colour synchronizing " burst " which is transmitted in the intervals between lines consists of two quadraturephase components, one of which assumes the same fixed phase in all lines and the other of which alternates in sign in successive lines. The two components 103, 104 may be transmitted in succession, Fig. 1, or may be transmitted simultaneously, Fig. 2, whereby the resultant signal 7, 7<SP>1</SP> alternates in phase Œ45 degrees with reference to the fixed phase 103. In a receiver for use in the system, Fig. 5, a transittime demodulator 3, 4, 16 is used to separate the I<SP>1</SP> and Q<SP>1</SP> components of the chrominance subcarrier signals and also functions to separate the components of the " burst " signal such that the fixed phase components 103 alone appear in the Q<SP>1</SP> signal channel and the alternating phase components 104 alone appear in the I<SP>1</SP> signal channel. The subcarrier and " burst " components are separated by appropriately timed gates 5, 6, 115, 122, the subcarrier components passing to demodulators 20, 24 and the " burst " components being applied to synchronize oscillators 9, 117 which supply reference signals to the corresponding demodulators. Oscillator 9 is synchronized at the fixed phase of component 103, but oscillator 117 is caused to alternate in phase in agreement with component 104 so that demodulator 24 is operated in the appropriate phase in successive lines to cause the output to be + I<SP>1</SP> despite the alternation of the subcarrier input in accordance with P.A.L. method of operation. The " burst " components function to establish the oscillators in the correct phase at the beginning of a line whilst synchronism during a line is maintained by the I<SP>1</SP> and Q<SP>1</SP> subcarrier components which are applied to control the oscillators via a frequency doubling circuit as described in Specification 1,070,193. The successive components of Fig. 1 may be separated without a delay line system (as in Fig. 5) by the use of appropriately timed gate circuits. The fixed phase component 103 may then be used to synchronize a quartz crystal oscillator which synchronizes a second oscillator via a phase shifter which is switched at line frequency in response to the alternating phase component 104. Reference is also made to the use of the " bursts " of Figs. 1 or 2 to synchronize a quartz crystal oscillator so that it is established at a phase midway between the " burst " phases of two successive line intervals. The production of a synchronizing signal as shown in Fig. 5, by adding components in successive lines with aid of a delay line, forms the subject of Specification 1,092,454.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DET25202A DE1194447B (en) | 1963-12-06 | 1963-12-06 | Color television receiver |
DE1964T0025813 DE1260520B (en) | 1963-12-06 | 1964-03-13 | Color television system with color sync signals for generating a reference carrier and line-frequency switching in the receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1092455A true GB1092455A (en) | 1967-11-22 |
Family
ID=25999803
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3211467A Expired GB1092455A (en) | 1963-12-06 | 1964-11-26 | Improvements relating to colour television systems and receivers therefor |
GB4803764A Expired GB1092454A (en) | 1963-12-06 | 1964-11-26 | Improvements relating to colour television |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4803764A Expired GB1092454A (en) | 1963-12-06 | 1964-11-26 | Improvements relating to colour television |
Country Status (9)
Country | Link |
---|---|
AT (2) | AT255508B (en) |
AU (2) | AU287601B2 (en) |
BE (1) | BE656631A (en) |
DD (1) | DD44179B1 (en) |
DE (2) | DE1194447B (en) |
ES (1) | ES306483A1 (en) |
FR (1) | FR1415318A (en) |
GB (2) | GB1092455A (en) |
NZ (2) | NZ140979A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1290177B (en) * | 1965-09-15 | 1969-03-06 | Standard Elektrik Lorenz Ag | Color television receiver circuit for setting the color saturation of a PAL signal |
GB1166632A (en) * | 1965-12-21 | 1969-10-08 | Communications Patents Ltd | Improved Wired Broadcasting Systems and Apparatus Therefor |
NZ150889A (en) * | 1966-12-03 | |||
GB1533148A (en) * | 1975-06-20 | 1978-11-22 | Indesit | Reception-transmission system for radio-electrical signal |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2735886A (en) * | 1956-02-21 | Color television system | ||
US2416424A (en) * | 1939-03-16 | 1947-02-25 | Hazeltine Research Inc | Synchronizing-signal separator |
LU31205A1 (en) * | 1951-01-22 | |||
US2754356A (en) * | 1952-04-24 | 1956-07-10 | Hazeltine Research Inc | Control systems for color-television receivers |
-
0
- NZ NZ140058D patent/NZ140058A/xx unknown
- NZ NZ140979D patent/NZ140979A/xx unknown
-
1963
- 1963-12-06 DE DET25202A patent/DE1194447B/en active Pending
-
1964
- 1964-03-13 DE DE1964T0025813 patent/DE1260520B/en active Pending
- 1964-11-02 DD DD10737364A patent/DD44179B1/en unknown
- 1964-11-03 AT AT680365A patent/AT255508B/en active
- 1964-11-03 AT AT931564A patent/AT247435B/en active
- 1964-11-20 AU AU51930/64A patent/AU287601B2/en not_active Expired
- 1964-11-26 GB GB3211467A patent/GB1092455A/en not_active Expired
- 1964-11-26 GB GB4803764A patent/GB1092454A/en not_active Expired
- 1964-11-27 ES ES306483D patent/ES306483A1/en not_active Expired
- 1964-12-01 FR FR996912A patent/FR1415318A/en not_active Expired
- 1964-12-04 BE BE656631D patent/BE656631A/xx unknown
-
1965
- 1965-03-05 AU AU56005/65A patent/AU292616B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NZ140979A (en) | |
DE1260520B (en) | 1968-02-08 |
AU287601B2 (en) | 1968-12-10 |
ES306483A1 (en) | 1965-04-16 |
DD44179B1 (en) | 1982-03-10 |
GB1092454A (en) | 1967-11-22 |
AT247435B (en) | 1966-06-10 |
AU292616B2 (en) | 1969-07-17 |
AU5193064A (en) | 1966-05-26 |
AU5600565A (en) | 1966-09-08 |
AT255508B (en) | 1967-07-10 |
NZ140058A (en) | |
FR1415318A (en) | 1965-10-22 |
BE656631A (en) | 1965-04-01 |
DE1194447B (en) | 1965-06-10 |
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