ES356250A1 - Connection provision in a color television receiver. (Machine-translation by Google Translate, not legally binding) - Google Patents
Connection provision in a color television receiver. (Machine-translation by Google Translate, not legally binding)Info
- Publication number
- ES356250A1 ES356250A1 ES356250A ES356250A ES356250A1 ES 356250 A1 ES356250 A1 ES 356250A1 ES 356250 A ES356250 A ES 356250A ES 356250 A ES356250 A ES 356250A ES 356250 A1 ES356250 A1 ES 356250A1
- Authority
- ES
- Spain
- 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)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
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 45 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 |
---|---|
ES356250A1 true ES356250A1 (en) | 1970-01-01 |
Family
ID=48537728
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES356250A Expired ES356250A1 (en) | 1967-07-19 | 1968-07-17 | Connection provision in a color television receiver. (Machine-translation by Google Translate, not legally binding) |
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) | NZ153182A (en) |
SE (1) | SE330219B (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS531608B1 (en) * | 1971-05-04 | 1978-01-20 | ||
JPS5426789Y2 (en) * | 1974-07-23 | 1979-09-03 | ||
JPS5346226A (en) * | 1976-10-08 | 1978-04-25 | Toshiba Corp | Color television receiving circuit for pal |
US4148058A (en) * | 1977-09-26 | 1979-04-03 | Rca Corporation | PAL switching control circuit |
JPS5542482A (en) * | 1978-09-19 | 1980-03-25 | Sanyo Electric Co Ltd | Color signal circuit of pal color television receiver |
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 |
---|---|---|---|---|
DE1248708B (en) * | 1965-05-21 | 1967-08-31 | Telefunken Patentverwertungsgesellschaft mbH, Ulm/Donau | Circuit arrangement m a color television receiver with cell-sequential switching to synchronize the order switching phase of the color sync pulse |
-
0
- NZ NZ153808D patent/NZ153808A/xx unknown
- NZ NZ153182D patent/NZ153182A/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 AU AU40684/68A patent/AU425473B2/en not_active Expired
- 1968-07-16 NL NL6810041A patent/NL6810041A/xx unknown
- 1968-07-17 FI FI203568A patent/FI42730C/en active
- 1968-07-17 NO NO282568A patent/NO122989B/no unknown
- 1968-07-17 FR FR1593556D patent/FR1593556A/fr not_active Expired
- 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 BE BE718244D patent/BE718244A/xx not_active IP Right Cessation
- 1968-07-18 DK DK348468A patent/DK126080C/en active
- 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
Also Published As
Publication number | Publication date |
---|---|
AT282717B (en) | 1970-07-10 |
DE1537479B2 (en) | 1975-07-24 |
DE1278494B (en) | 1968-09-26 |
DK348468A (en) | |
NL6810041A (en) | 1969-01-21 |
FI203568A (en) | 1969-01-20 |
NO136601B (en) | 1977-06-20 |
BE718244A (en) | 1968-12-31 |
AU426913B2 (en) | 1972-08-07 |
DK126080C (en) | 1976-07-19 |
AU425473B2 (en) | 1972-06-26 |
NO136601C (en) | 1977-09-28 |
DK126080B (en) | 1973-06-04 |
DE1537479A1 (en) | 1969-09-25 |
SE330219B (en) | 1970-11-09 |
NZ153182A (en) | |
AU4068468A (en) | 1970-01-22 |
FI42730B (en) | 1970-06-30 |
NZ153808A (en) | |
FR1593556A (en) | 1970-06-01 |
FI42730C (en) | 1970-10-12 |
AU4290668A (en) | 1970-03-12 |
NO122989B (en) | 1971-09-13 |
GB1239052A (en) | 1971-07-14 |
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