GB1005290A - Improvements in or relating to decoder circuit arrangements in colour television receivers - Google Patents
Improvements in or relating to decoder circuit arrangements in colour television receiversInfo
- Publication number
- GB1005290A GB1005290A GB31583/63A GB3158363A GB1005290A GB 1005290 A GB1005290 A GB 1005290A GB 31583/63 A GB31583/63 A GB 31583/63A GB 3158363 A GB3158363 A GB 3158363A GB 1005290 A GB1005290 A GB 1005290A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- colour television
- phase
- degrees
- subcarrier
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
1,005,290. Colour television receivers. MULLARD Ltd. April 28, 1964 [Aug. 9, 1963], No. 31583/63. Heading H4F. The invention relates to a demodulator circuit for a colour television signal of the type in which two colour components I, Q, Fig. 3 (b), are modulated in quadrature on a sub-carrier signal, the phase of one of the components being reversed in alternate lines as indicated at IN and I R . In accordance with the invention the subcarrier signal is demodulated with the aid of two synchronous demodulations A and B, Fig. 3 (a), at phase angles A and B, Fig. 3 (b), which are symmetrically disposed with respect to the subcarrier component (Q) which is not subject to phase reversal during alternate lines, switch means 3 operating at line rate being provided either to reverse the connections of the subcarrier reference signals to the two demodulators (as illustrated), or to reverse the output connection 12 and 13 of the demodulators to the output signal channels. The switch operation is controlled by a square-wave signal applied at terminal 4 which is synchronized from the line time-base, and is established in operation in the correct phase in relation to the line sequential changes in the received signal by means of a special synchronizing signal included during the field blanking period. The invention is described more particularly as applied to the XZ demodulation system (see " Colour Television " by Carat & Townsend, 1961, p. 241 et seq.), two examples being given where the demodulation axes A and B are respectively Œ 17 degrees and Œ19À5 degrees with respect to the - Q axis of 213 degrees. A detailed circuit utilizing diode switching elements is described for switch 3 with reference to Fig. 4 (not shown).
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB31583/63A GB1005290A (en) | 1963-08-09 | 1963-08-09 | Improvements in or relating to decoder circuit arrangements in colour television receivers |
NL6408848A NL6408848A (en) | 1963-08-09 | 1964-08-01 | |
FR984671A FR1403595A (en) | 1963-08-09 | 1964-08-10 | Decoding circuit for color television receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB31583/63A GB1005290A (en) | 1963-08-09 | 1963-08-09 | Improvements in or relating to decoder circuit arrangements in colour television receivers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1005290A true GB1005290A (en) | 1965-09-22 |
Family
ID=10325292
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB31583/63A Expired GB1005290A (en) | 1963-08-09 | 1963-08-09 | Improvements in or relating to decoder circuit arrangements in colour television receivers |
Country Status (3)
Country | Link |
---|---|
FR (1) | FR1403595A (en) |
GB (1) | GB1005290A (en) |
NL (1) | NL6408848A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3474190A (en) * | 1965-07-22 | 1969-10-21 | Telefunken Patent | Phase distortion compensating circuit for pal color television recording system |
-
1963
- 1963-08-09 GB GB31583/63A patent/GB1005290A/en not_active Expired
-
1964
- 1964-08-01 NL NL6408848A patent/NL6408848A/xx unknown
- 1964-08-10 FR FR984671A patent/FR1403595A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3474190A (en) * | 1965-07-22 | 1969-10-21 | Telefunken Patent | Phase distortion compensating circuit for pal color television recording system |
Also Published As
Publication number | Publication date |
---|---|
FR1403595A (en) | 1965-06-18 |
NL6408848A (en) | 1965-02-10 |
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