GB1239052A - - Google Patents
Info
- Publication number
- GB1239052A GB1239052A GB1239052DA GB1239052A GB 1239052 A GB1239052 A GB 1239052A GB 1239052D A GB1239052D A GB 1239052DA GB 1239052 A GB1239052 A GB 1239052A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phase
- signal
- generator
- output
- degrees
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/44—Colour synchronisation
- H04N9/465—Synchronisation of the PAL-switch
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
- Color Television Systems (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
1,239,052. Colour television. TELEFUNKEN PATENTVERWERTUNG G.m.b.H. ' 19 July, 1968 [19 July, 1967; 19 Sept., 1967], No. 34432/68. Heading H4F. In a PAL receiver an arrangement ensures that the phase of the half-line frequency signal operating the switch-over phase reversal of the (R-Y) demodulating sub-carrier signal is correct. The colour bursts are combined (said term including performing a phase comparison with) with the switched demodulation signal and the resultant signal used to control the phase of operation of the switch-over signal generator. In the embodiments of Figs. 1 to 9, the " combination " is an additive process in addition means 15, whereas in the embodiment of Figs. 10 and 11, said phase comparing process is used. In Fig. 1, chrominance signals including the colour bursts are applied at terminal F, the colour bursts having place variations from line to line indicated at 14. The chrominance signals are synchronously demodulated at 2 with the direct output of sub-carrier oscillator 7 to give the (B-Y) signal and at 3 with the phase quadrative output of said oscillator to give the (R-Y) signal, 90 degrees place shifter 9 and PAL switch 10 causing a phase reversal on alternate lines. The thus phase alternated subcarrier 17, Figs. 2 and 3, is fed to addition means 15 for combination with the colour bursts. In the case of correct phasing of the switching signal from generator 11, the output of 15 has a large amplitude (b), Fig. 2, yielding on rectification a large D.C. signal (C) which is such as not to effect the operation of generator 11. With incorrect phasing of the switching signal (Fig. 3), the D.C. signal (C) is small, and so readjusts generator 11. In the embodiment of Fig. 4 (not shown), a combination of the output of switch 10 and the direct output of oscillator 7, is fed to the left input of addition means 15. This produces a small D.C. signal for the correct phase case and a large D.C. signal for the incorrect case. In the embodiment of Fig. 7, the +90 phased colour burst signals 14 are fed to addition means 15 and produced by summing at 24 the colour burst signals of the previous line. The D.C. signal for controlling generator 11 behaves as in the embodiment of Fig. 1. In the embodiment of Fig. 10, the output of the subcarrier generator 7 is, after being switched and alternately phase reversed at 10, phase shifted by 45 degrees. The phase thus alternates between + 45 degrees and + 225 degrees. The colour burst alternates in phase between Œ45 degrees. The phase discrimination 26 is of the type giving zero output for 0 and and 180 degrees phase difference between its input signals, and a maximum positive on negative signal for a phase difference of +90 and -90 degrees respectively. With correct phasing of the switch signal from generator 11, discriminator 26 gives a positive triangular output voltage, which does not affect generator 11 whereas incorrect phasing gives a negative output voltage, causing the generator to stop, leaving the switch 10 in such a position that when the generator 11 restarts, under the control of the positive discriminator output resulting from the applied constant phase subcarries, the correct phasing state is attained.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1967T0034350 DE1278494B (en) | 1967-07-19 | 1967-07-19 | Circuit in a PAL color television receiver to correct the switching phase of the line-frequency switch |
DE1967T0034815 DE1537479B2 (en) | 1967-07-19 | 1967-09-19 | Circuit in a PAL color television receiver to correct the switching phase of the line-frequency switch |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1239052A true GB1239052A (en) | 1971-07-14 |
Family
ID=48537728
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1239052D Expired GB1239052A (en) | 1967-07-19 | 1968-07-19 |
Country Status (13)
Country | Link |
---|---|
AT (1) | AT282717B (en) |
AU (2) | AU425473B2 (en) |
BE (1) | BE718244A (en) |
DE (2) | DE1278494B (en) |
DK (1) | DK126080C (en) |
ES (1) | ES356250A1 (en) |
FI (1) | FI42730C (en) |
FR (1) | FR1593556A (en) |
GB (1) | GB1239052A (en) |
NL (1) | NL6810041A (en) |
NO (2) | NO122989B (en) |
NZ (2) | NZ153808A (en) |
SE (1) | SE330219B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5346226A (en) * | 1976-10-08 | 1978-04-25 | Toshiba Corp | Color television receiving circuit for pal |
DE2841891A1 (en) * | 1977-09-26 | 1979-03-29 | Rca Corp | ARRANGEMENT FOR CONTROLLING THE ON-LINE SWITCHING OF COLOR TELEVISION DECODERS |
EP0009237A1 (en) * | 1978-09-19 | 1980-04-02 | Sanyo Electric Co., Ltd. | Chrominance signal circuit in color television receiver |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS531608B1 (en) * | 1971-05-04 | 1978-01-20 | ||
JPS5426789Y2 (en) * | 1974-07-23 | 1979-09-03 | ||
JPS5730486A (en) * | 1980-07-30 | 1982-02-18 | Matsushita Electric Ind Co Ltd | Chrominance demodulator |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NZ145104A (en) * | 1965-05-21 |
-
0
- NZ NZ153182D patent/NZ153182A/xx unknown
- NZ NZ153808D patent/NZ153808A/xx unknown
-
1967
- 1967-07-19 DE DE1967T0034350 patent/DE1278494B/en active Pending
- 1967-09-19 DE DE1967T0034815 patent/DE1537479B2/en active Granted
-
1968
- 1968-07-15 SE SE971468A patent/SE330219B/xx unknown
- 1968-07-16 NL NL6810041A patent/NL6810041A/xx unknown
- 1968-07-16 AU AU40684/68A patent/AU425473B2/en not_active Expired
- 1968-07-17 FR FR1593556D patent/FR1593556A/fr not_active Expired
- 1968-07-17 FI FI203568A patent/FI42730C/en active
- 1968-07-17 NO NO282568A patent/NO122989B/no unknown
- 1968-07-17 ES ES356250A patent/ES356250A1/en not_active Expired
- 1968-07-18 AT AT692768A patent/AT282717B/en not_active IP Right Cessation
- 1968-07-18 DK DK348468A patent/DK126080C/en active
- 1968-07-18 BE BE718244D patent/BE718244A/xx not_active IP Right Cessation
- 1968-07-19 GB GB1239052D patent/GB1239052A/en not_active Expired
- 1968-09-03 AU AU42906/68A patent/AU426913B2/en not_active Expired
-
1971
- 1971-05-10 NO NO174071A patent/NO136601C/en unknown
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5346226A (en) * | 1976-10-08 | 1978-04-25 | Toshiba Corp | Color television receiving circuit for pal |
JPS5747874B2 (en) * | 1976-10-08 | 1982-10-13 | ||
DE2841891A1 (en) * | 1977-09-26 | 1979-03-29 | Rca Corp | ARRANGEMENT FOR CONTROLLING THE ON-LINE SWITCHING OF COLOR TELEVISION DECODERS |
EP0009237A1 (en) * | 1978-09-19 | 1980-04-02 | Sanyo Electric Co., Ltd. | Chrominance signal circuit in color television receiver |
Also Published As
Publication number | Publication date |
---|---|
NO136601C (en) | 1977-09-28 |
FI42730C (en) | 1970-10-12 |
FI42730B (en) | 1970-06-30 |
NO136601B (en) | 1977-06-20 |
DE1537479B2 (en) | 1975-07-24 |
AU425473B2 (en) | 1972-06-26 |
DE1278494B (en) | 1968-09-26 |
NO122989B (en) | 1971-09-13 |
FI203568A (en) | 1969-01-20 |
DK348468A (en) | |
NZ153182A (en) | |
AU4290668A (en) | 1970-03-12 |
BE718244A (en) | 1968-12-31 |
FR1593556A (en) | 1970-06-01 |
NZ153808A (en) | |
NL6810041A (en) | 1969-01-21 |
DK126080B (en) | 1973-06-04 |
SE330219B (en) | 1970-11-09 |
AT282717B (en) | 1970-07-10 |
ES356250A1 (en) | 1970-01-01 |
AU4068468A (en) | 1970-01-22 |
DK126080C (en) | 1976-07-19 |
DE1537479A1 (en) | 1969-09-25 |
AU426913B2 (en) | 1972-08-07 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
429A | Application made for amendment of specification (sect. 29/1949) | ||
429H | Application (made) for amendment of specification now open to opposition (sect. 29/1949) | ||
429D | Case decided by the comptroller ** specification amended (sect. 29/1949) | ||
SP | Amendment (slips) printed | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PE20 | Patent expired after termination of 20 years |