DE1194447B - Color television receiver - Google Patents
Color television receiverInfo
- Publication number
- DE1194447B DE1194447B DET25202A DET0025202A DE1194447B DE 1194447 B DE1194447 B DE 1194447B DE T25202 A DET25202 A DE T25202A DE T0025202 A DET0025202 A DE T0025202A DE 1194447 B DE1194447 B DE 1194447B
- Authority
- DE
- Germany
- Prior art keywords
- color
- line
- frequency
- carrier
- lines
- 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.)
- Pending
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)
Description
DEUTSCHESGERMAN
PATENTAMTPATENT OFFICE
AUSLEGESCHRIFTEDITORIAL
Int. Cl.:Int. Cl .:
H04nH04n
Deutsche KL: 21 al-34/31 German KL: 21 al -34/31
Nummer: 1194 447Number: 1194 447
Aktenzeichen: T 25202 VIII a/21 alFile number: T 25202 VIII a / 21 al
Anmeldetag: 6. Dezember 1963Filing date: December 6, 1963
Auslegetag: 10. Juni 1965Opening day: June 10, 1965
Die Erfindung betrifft einen Farbfernsehempfänger, in dem mit farbträgerfrequenten Farbsynchronimpulsen konstanter Phase, die in den Zeilenaustastlücken übertragen werden, ein Bezugsträgeroszillator synchronisiert wird, der einen zur Demodulation eines Farbträgers dienenden Bezugsträger konstanter Frequenz und Phase erzeugt.The invention relates to a color television receiver, in that with color carrier-frequency color sync pulses of constant phase, which are in the line blanking gaps are transmitted, a reference carrier oscillator is synchronized, the one for demodulating a Color carrier serving reference carrier of constant frequency and phase generated.
Ein Empfänger dieser Art ist z. B. ein Farbfernsehempfänger für das PAL-Farbfernsehsystem, bei dem ein Farbträger nach zwei Modulationsachsen moduliert und eine Modulationsachse zeilenfrequent um 180° umgeschaltet wird. Bei einem solchen PAL-Farbfernsehempfänger ist es bekannt, unter Verwendung einer Verzögerungsleitung mit der Verzögerungszeit einer Zeilendauer die empfangenen farbträgerfrequenten Signale zweier zeitlich aufeinanderfolgenden Zeilen in einer Addierstufe zu addieren und in einer Subtrahierstufe zu subtrahieren, wobei am Ausgang der Addierstufe nur das der nicht umgeschalteten Modulationsachse entsprechende und am Ausgang der Subtrahierstufe nur das der umgeschalteten Modulationsachse entsprechende amplitudenmodulierte farbträgerfrequente Signal entsteht. Der Bezugsträger dient dann dazu, eine einneutige Amplitudenmodulation dieser farbträgerfrequenten Signale zu ermöglichen.A recipient of this type is e.g. B. a color television receiver for the PAL color television system which modulates a color subcarrier according to two modulation axes and one modulation axis at a line frequency is switched by 180 °. With such a PAL color television receiver it is known to use a delay line with the delay time the received color subcarrier-frequency signals of two temporally successive signals of a line duration Add rows in an adder and subtract them in a subtracter, where at the output of the adder only the one corresponding to the modulation axis that has not been switched and at the output of the subtraction stage only the amplitude-modulated corresponding to the switched modulation axis color subcarrier-frequency signal arises. The reference carrier then serves to create a unique To enable amplitude modulation of these color carrier-frequency signals.
Der Erfindung liegt die Aufgabe zugrunde, bei einem PAL-Farbf ernsehempf anger der letztgenannten Art die Synchronisierung des Bezugsträgeroszillators zu verbessern.The invention is based on the object of the latter in a PAL color television receiver Way to improve the synchronization of the reference carrier oscillator.
Die Erfindung besteht darin, daß der Addierstufe das unverzögerte und das um eine Zeilendauer verzögerte farbträgerfrequente Signal einschließlich der Farbsynchronimpulse zugeführt werden und daß die Summe der Farbsynchronimpulse zweier zeitlich aufeinanderfolgender Zeilen am Ausgang der Addierstufe zur Synchronisierung des Oszillators ausgenutzt wird.The invention consists in that the adder is the undelayed and the delayed by a line duration color carrier frequency signal including the color sync pulses are supplied and that the Sum of the color sync pulses of two consecutive lines at the output of the adder stage is used to synchronize the oscillator.
Es ist zwar bei einem Schwarz-Weiß-Fernsehempfänger bekannt, die normalen Zeilensynchronimpulse aus zwei zeitlich aufeinanderfolgenden Zeilen zusammenzusetzen, um eine bessere Störfreiheit zu erzielen. Hierbei sind aber zusätzliche Mittel zur Verzögerung des Videosignals erforderlich, während bei der Erfindung eine zu anderen Zwecken ohnehin vorhandene Schaltung in vorteilhafter Weise zur Verbesserung der Synchronisierung eines Bezugsträgeroszillators ausgenutzt wird. Die Aufgabe, einen solchen Bezugsträgeroszillator zu synchronisieren, liegt außerdem bei der bekannten Schaltung nicht vor. Durch die erfindungsgemäße Maßnahme wird eine Reihe beachtlicher Vorteile erzielt. Zunächst wird FarbfernsehempfängerIt is known in a black and white television receiver, the normal line sync pulses to be composed of two consecutive lines in order to achieve better freedom from interference. Here, however, additional means for delaying the video signal are required, while at According to the invention, a circuit which is already present for other purposes is advantageously used for improvement the synchronization of a reference carrier oscillator is used. The task of one To synchronize such a reference carrier oscillator is also not available in the known circuit. The measure according to the invention achieves a number of considerable advantages. First will Color television receiver
Anmelder:Applicant:
TelefunkenTelefunken
Patentverwertungsgesellschaft m. b. H.,
Ulm/Donau, Elisabethenstr. 3Patentverwertungsgesellschaft mb H.,
Ulm / Danube, Elisabethenstr. 3
Als Erfinder benannt:
Walter Bruch, HannoverNamed as inventor:
Walter Bruch, Hanover
die Amplitude des zur Synchronisierung des Bezugsträgeroszillators verfügbaren Signals gegenüber der der Farbsignale verdoppelt. Dies ist besonders dann vorteilhaft, wenn die Verstärkung im Farbkanal aus irgendeinem Grunde herabgesetzt werden muß und die Farbsignale nur eine kleine Amplitude haben. Durch die Kammfilterwirkung, die durch die Verzögerungsleitung bewirkt und in der Beschreibung näher erläutert wird, wird das Rauschen in den Farbsynchronimpulsen am Eingang des Bezugsträgeroszillators herabgesetzt. Ein weiterer Vorteil besteht darin, daß auch dann, wenn ein Farbsynchronimpuls ausfällt, noch ein Synchronisiersignal für den Bezugsträgeroszillator vorhanden ist. Ein Ausfall eines Farbsynchronimpulses kann insbesondere bei Magnetbandaufzeichnungen durch sogenannte »drop outs« auftreten. Durch die vektorielle Addition der Farbsynchronimpulse wird erreicht, daß sich Frequenz und Phase des Bezugsträgers auf den Mittelwert von zwei aufeinanderfolgenden Farbsynchronimpulsen einstellen. Dadurch werden Fehler in der Frequenz und in der Phase der Farbsynchronimpulse ausgeglichen. Dies ist besonders vorteilhaft für Magnetbandaufzeichnung, bei der durch Laufungenauigkeiten Fehler in der Frequenz und in der Phase der Farbsynchronimpulse entstehen können.the amplitude of the for synchronizing the reference carrier oscillator available signal is doubled compared to that of the color signals. This is especially true then advantageous if the gain in the color channel has to be reduced for any reason and the color signals only have a small amplitude. By the comb filtering effect created by the delay line caused and explained in more detail in the description, the noise in the color sync pulses at the input of the reference carrier oscillator degraded. Another advantage is that even when a color sync pulse fails, a synchronization signal for the reference carrier oscillator is available. A failure of a color sync pulse can occur in particular with magnetic tape recordings due to so-called "drop outs". Through the vectorial addition of the color sync pulses it is achieved that the frequency and phase of the reference carrier are on the average of set two successive color sync pulses. This will cause errors in frequency and balanced in the phase of the color sync pulses. This is particularly beneficial for magnetic tape recording, in the case of errors in the frequency and in the phase of the color sync pulses caused by running inaccuracies can arise.
Die Erfindung wird im folgenden an Hand der Zeichnung näher erläutert.The invention is explained in more detail below with reference to the drawing.
Fig. 1 zeigt ein Prinzipschaltbild der Erfindung; an Hand der1 shows a basic circuit diagram of the invention; based on
F i g. 2 ist der durch die Kammfilterwirkung bewirkte Vorteil näher erläutert;F i g. 2 the advantage brought about by the comb filter effect is explained in more detail;
F i g. 3 zeigt Kurvenformen zur Erläuterung der Fig.l;F i g. 3 shows waveforms for explaining Fig.l;
Fig. 4 zeigt ein ausführlicheres Schaltungsbeispiel zur Synchronisierung des Bezugsträgeroszillators gemäß der Erfindung. Fig. 4 shows a more detailed circuit example for synchronizing the reference carrier oscillator according to the invention.
509 579/152509 579/152
Claims (1)
quenzbereiche 13 nicht durchgelassen werden. Dies
bedeutet, daß Rauschanteile mit Frequenzen in denIn Fig. 1, a color subcarrier-frequency PAL is shown. By means of the delay line 3 and the signal consisting of the phase constant of a 180 ° phase rotating element 15, the color sync pulses between the lines and the carrier-frequency signals - useful signal Q + // or Q-jI during the line, from of the lines at terminal 1 in two adding stages 4, a terminal 1 once via a line 2 and constantly added or subtracted to 5 16. The color synchronicity via a delay element 3 with the synchronizing pulses, which always have the same phase, delays a line duration of an adder 4 due to the 180 ° phase rotation in the lead. In the adder stage 4, the phase rotator 15 in the adder stage 16 is switched off. In the frequency signals from two temporally successive adding stages 4, they are added together to form color-synchronous lines. The output io pulses double amplitude. In the gate 5, the signal of the adder 4 is two gates 5, 6 moves - only open between the lines, the leads. The gate 5 is only scanned out between the lines of color sync pulses 7 and via one opens and scans the color sync pulses 7, which are fed from resistor 17 and a line 18 to the reference of the color sync pulses two on a single carrier oscillator 9 for synchronization. The other following lines are composed of 15 color sync pulses 7 synchronize between the color carrier-frequency signal. The color lines the reference carrier oscillator 9. When signals from the synchronous pulses 7 arrive via a line 8 on PAL color television system, the output of a reference carrier oscillator 9, which has a reference adder 4 constantly receives the signal 2 Q ', which is transmitted via a carrier with a constant frequency and phase generated. Line 19 is fed to a demodulator 20, In the gate 6, which is only open during the lines 20 to the other hand from the reference carrier oscillator 9, the useful signal 2 Q ', which is added by adding a line 21 of the operator serving for demodulation in two successive Lines conjugated tensile member is added. Complex signals Q ' + //' and Q'-jI 'are available at a terminal 22, then signal 2 Q' is continuously available. The blanked and fed to a demodulator 10. Adder 16 alternately supplies demodulator 10, on the other hand, via a 25 color carrier-frequency signal ± 21 ', which is fed to a demodulator 24 via a line 11 of device 23 generated in reference carrier oscillator 9, the reference carrier for demodulation. At the output, the reference carrier output of the demodulator 10 is also connected to a terminal 11 via a line 25. The color subcarrier-frequency signal Q ' is then always available at a terminal 26. the signal ± 27 'is available. The changing Po-On the basis of FIG. 2 is the advantageous comb larity of ± 21 ' is explained in more detail by a filter effect, not shown. If, as in FIG. 1, a line-frequency actuated phase shifter of 180 °, a signal with the frequency / once directly and one in line 25 or 23 is balanced. The color times delayed by one line duration is fed to an adder carrier-frequency output signal of the adder stage 4, stage 4, then the output signal U 2 _ 16, which has only two defined phase positions 0 and π of this adder stage 4 according to the one shown in the right-hand part of FIG. are in full-wave rectifier circuits F i g. The curve 12 shown in FIG. 2 is freed from the frequency / 27, 28 of the phase jumps and is dependent on the voltage applied. The illustrated if the reference carrier oscillator maxima via the line 18 have a spacing that is fed to the line frequency gate 9. The sum of the color carrier frequencies corresponds to. The delay time of the delay constant phase signals at the output of the line 3 is now dimensioned so that the color carrier 40 rectifier circuits 27, 28 synchronize the and its sideband frequencies, which are known to be around reference carrier oscillator 9 during the line. The multiple of the line frequency from the color subcarrier 90 ° phase difference between the signals 2 Q ' are grouped away, each with the maxima of and ± 21' at the output of the adder 4, 16 curve 12 will coincide. The curve 12 in FIG. 2 in that the diodes in the rectification recognize that the circuit with the converter circuit 27 means that the polarity of the rectifier circuit 28 shown in dashed lines is different from that of the diode delay line.
frequency areas 13 are not allowed to pass. this
means that noise components with frequencies in the
Britische Patentschrift Nr. 537 878. xo Publications considered:
British Patent No. 537,878.
Priority Applications (14)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NZ140979D NZ140979A (en) | 1963-12-06 | ||
NZ140058D NZ140058A (en) | 1963-12-06 | ||
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 |
DD10737364A DD44179B1 (en) | 1963-12-06 | 1964-11-02 | COLOR TELEVISION SYSTEM |
AT931564A AT247435B (en) | 1963-12-06 | 1964-11-03 | Color television receiver |
AT680365A AT255508B (en) | 1963-12-06 | 1964-11-03 | Color television system |
AU51930/64A AU287601B2 (en) | 1963-12-06 | 1964-11-20 | Colour television receiver |
GB4803764A GB1092454A (en) | 1963-12-06 | 1964-11-26 | Improvements relating to colour television |
GB3211467A GB1092455A (en) | 1963-12-06 | 1964-11-26 | Improvements relating to colour television systems and receivers therefor |
ES306483D ES306483A1 (en) | 1963-12-06 | 1964-11-27 | Improvements relating to colour television |
FR996912A FR1415318A (en) | 1963-12-06 | 1964-12-01 | Television receiver |
BE656631D BE656631A (en) | 1963-12-06 | 1964-12-04 | |
AU56005/65A AU292616B2 (en) | 1963-12-06 | 1965-03-05 | Colour television system |
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 |
---|---|
DE1194447B true DE1194447B (en) | 1965-06-10 |
Family
ID=25999803
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DET25202A Pending DE1194447B (en) | 1963-12-06 | 1963-12-06 | Color television receiver |
DE1964T0025813 Pending 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 |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1964T0025813 Pending 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 |
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) | GB1092454A (en) |
NZ (2) | NZ140979A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1282680B (en) * | 1965-12-21 | 1968-11-14 | Communications Patents Ltd | Wire radio system for color television according to the 625-line Pal system |
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 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NZ150889A (en) * | 1966-12-03 | |||
GB1533148A (en) * | 1975-06-20 | 1978-11-22 | Indesit | Reception-transmission system for radio-electrical signal |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB537878A (en) * | 1939-03-16 | 1941-07-10 | Hazeltine Corp | Improvements in television synchronizing-signal separators |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2735886A (en) * | 1956-02-21 | Color television system | ||
BE508622A (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 GB4803764A patent/GB1092454A/en not_active Expired
- 1964-11-26 GB GB3211467A patent/GB1092455A/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
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB537878A (en) * | 1939-03-16 | 1941-07-10 | Hazeltine Corp | Improvements in television synchronizing-signal separators |
Cited By (2)
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 |
DE1282680B (en) * | 1965-12-21 | 1968-11-14 | Communications Patents Ltd | Wire radio system for color television according to the 625-line Pal system |
Also Published As
Publication number | Publication date |
---|---|
BE656631A (en) | 1965-04-01 |
GB1092454A (en) | 1967-11-22 |
NZ140979A (en) | |
GB1092455A (en) | 1967-11-22 |
NZ140058A (en) | |
ES306483A1 (en) | 1965-04-16 |
AU292616B2 (en) | 1969-07-17 |
AT255508B (en) | 1967-07-10 |
AU287601B2 (en) | 1968-12-10 |
FR1415318A (en) | 1965-10-22 |
AT247435B (en) | 1966-06-10 |
DE1260520B (en) | 1968-02-08 |
DD44179B1 (en) | 1982-03-10 |
AU5193064A (en) | 1966-05-26 |
AU5600565A (en) | 1966-09-08 |
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