DE3406143C2 - Device for ensuring the synchronous control of an image reproduction device from a continuously running sound carrier or, conversely, a sound reproduction device from a continuously running image carrier - Google Patents
Device for ensuring the synchronous control of an image reproduction device from a continuously running sound carrier or, conversely, a sound reproduction device from a continuously running image carrierInfo
- Publication number
- DE3406143C2 DE3406143C2 DE19843406143 DE3406143A DE3406143C2 DE 3406143 C2 DE3406143 C2 DE 3406143C2 DE 19843406143 DE19843406143 DE 19843406143 DE 3406143 A DE3406143 A DE 3406143A DE 3406143 C2 DE3406143 C2 DE 3406143C2
- Authority
- DE
- Germany
- Prior art keywords
- pulses
- pulse
- continuously running
- sound
- carrier
- 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
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B31/00—Associated working of cameras or projectors with sound-recording or sound-reproducing means
- G03B31/04—Associated working of cameras or projectors with sound-recording or sound-reproducing means in which sound track is not on, but is synchronised with, a moving-picture film
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Television Signal Processing For Recording (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Description
PeriodendauerPeriod duration
max. Synchronimpulsfolgefrequenzmax
Die Erfindung bezieht sich auf eine Einrichtung gemaß dem Oberbegriff des Patentanspruchs.The invention relates to a device according to the preamble of the claim.
Es ist eine Abtastvorrichtung für Steuermarkierungen bekannt, die zwischen den Perforationslöchern auf der Perforationspiste eines Films angebracht sind. Um die von den Steuermarkierungen erzeugten Synchronimpulse von den durch die Perforationslöcher erzeugten Störimpulsen zu trennen, werden die Impulse mittels einer RC-Integration auf ihren Energieinhalt geprüft, der wegen der geringeren Größe der Perforationslöcher bei Störimpulsen erheblich geringer ist als bei den Synchronimpulsen. Diese Impulsabtrennung läßt sich jedoch nur bei Bildträgern anwenden, welche als Steuermarkierungen Löcher aufweisen. Bei magnetischen Steuermarkierungen versagt diese Technik. Weiterhin setzt die bekannte Impulsabtrennung einen bestimmten Mindestabstand zwischen zwei aufeinanderfolgenden Störimpulsen voraus, damit sich der Kondensator des zur Integration verwendeten RC-Gliedes zwischen dem Auftreten der Störimpulse wieder entladen kann. Ist der zeitliche Abstand zweier aufeinanderfolgender Störimpulse kleiner als die Entladezeitkonstante des RC-Gliedes, so werden die Energieinhalte beider Störimpulse summiert, so daß möglicherweise ein Synchronimpuls vorgetäuscht wird.It is a scanning device for tax marks known, which are attached between the perforation holes on the perforation track of a film. Around the synchronizing pulses generated by the control marks from those generated by the perforation holes To separate interference pulses, the pulses are checked for their energy content by means of an RC integration, which because of the smaller size of the perforation holes is considerably smaller in the case of interference pulses than in the Sync pulses. However, this pulse separation can only be used with image carriers which are used as control markings Have holes. This technique fails with magnetic control marks. Farther the known pulse separation sets a certain minimum distance between two successive ones Interference pulses ahead, so that the capacitor of the RC element used for integration between the Occurrence of the glitches can discharge again. Is the time interval between two successive interference pulses smaller than the discharge time constant of the RC element, the energy content of both interference pulses will be summed up, so that a sync pulse may be simulated.
Die Aufgabe der Erfindung besteht demgegenüber darin, eine Störimpuisaustastung unabhängig von der Art der Steuermarkierungen zu schaffen, welche zudem Fehler der erwähnten Art ausschließt.The object of the invention is, in contrast, to a Störimpuisaustastung independent of the To create type of control marks, which also excludes errors of the type mentioned.
Diese Aufgabe w:rd erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruchs gelöst. This task w: rd achieved by the characterizing features of claim.
Bei der erfindungsgemäßen Einrichtung erfolgt eine zeitgenaue Messung der Dauer der Impulse, wodurch sich mit großer Sicherheit echte Synchronimpulse von kürzeren Störimpulsen unterscheiden lassen. Eine solehe zeitgenaue Impulsüberwachung ist zwar an sich bekannt. Hinzu kommt jedoch bei der erfindungsgemäßen Einrichtung, daß bei Erkennung eines echten Synchronimpulses auf eine ausreichende Pausendauer geachtet wird, in dem entsprechend lange gegebenenfalls ankommende Störimpulse überhaupt unterdrückt werden.In the device according to the invention, the duration of the pulses is measured at a precise time, as a result of which real synchronous pulses can be distinguished from shorter interference pulses with great certainty. One such marriage time-accurate pulse monitoring is known per se. However, there is also the case of the invention Device that ensures that there is a sufficient pause when a real sync pulse is detected will be, in the correspondingly long possibly arriving Interference pulses are suppressed at all.
Die erfindungsgemäß vorgesehene Störimpuisaustastung läßt sich in einem Synchronsteuergerät für die kein weiterer Synchronimpuls mehr eintreffen kann. Für diese Periodendauer (typ. 25 ms) wird nun der entsprechende Impulseingang des Steuergerätes gesperrt und somit die Störimpulssicherheit weiter erhöht.The interference pulse blanking provided according to the invention can be used in a synchronous control device for the no further sync pulse can arrive. For this period (typically 25 ms) the corresponding Pulse input of the control unit blocked and thus the interference pulse security further increased.
Beide Arten der Störimpuisaustastung sind zudem auch in den Anlauf- und Stop-Phasen des Magnetbandes weiter wirksam, wenn der impulsverstärker dem Stand der Technik entspricht.Both types of interfering pulse blanking are also in the start and stop phases of the magnetic tape further effective if the pulse amplifier corresponds to the prior art.
Prinzipiell wäre es außerdem möglich, mit dem Einsatz eines Mikroprozessors die genannten Zeiten für die Störimpuisaustastung, ausgehend von der Synchronimpulsdauer und der Synchronimpulsfolgefrequenz, jeweils entsprechend zu optimieren und gegebenenfalls dynamisch nachzuführen. In der Praxis jedoch ist dies bisher nicht sinnvoll, v/eil die beschriebene Störimpuisaustastung die Anzahl der noch verbliebenen Störimpulse auf wenige Ausnahmen reduziert.In principle it would also be possible with the use of a microprocessor, the times mentioned for the interfering pulse blanking, based on the sync pulse duration and the sync pulse repetition frequency, to be optimized accordingly and if necessary to track dynamically. In practice, however, this has not yet made sense, mainly the interference pulse blanking described above the number of remaining glitches has been reduced to a few exceptions.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19843406143 DE3406143C2 (en) | 1984-02-21 | 1984-02-21 | Device for ensuring the synchronous control of an image reproduction device from a continuously running sound carrier or, conversely, a sound reproduction device from a continuously running image carrier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19843406143 DE3406143C2 (en) | 1984-02-21 | 1984-02-21 | Device for ensuring the synchronous control of an image reproduction device from a continuously running sound carrier or, conversely, a sound reproduction device from a continuously running image carrier |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3406143A1 DE3406143A1 (en) | 1985-08-29 |
DE3406143C2 true DE3406143C2 (en) | 1986-10-02 |
Family
ID=6228319
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19843406143 Expired DE3406143C2 (en) | 1984-02-21 | 1984-02-21 | Device for ensuring the synchronous control of an image reproduction device from a continuously running sound carrier or, conversely, a sound reproduction device from a continuously running image carrier |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3406143C2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4815013A (en) * | 1987-07-30 | 1989-03-21 | Universal Recording Corporation | Variable speed film transport interlock system and method using same |
US4933881A (en) * | 1987-07-30 | 1990-06-12 | Universal Recording Corporation | Variable speed film transport interlock system |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3515470A (en) * | 1967-11-20 | 1970-06-02 | Bell & Howell Co | Control information recording and sensing methods and apparatus |
DE2415365C3 (en) * | 1974-03-29 | 1983-12-08 | Siemens AG, 1000 Berlin und 8000 München | Circuit arrangement for masking out pulses whose duration is shorter than a predetermined test duration tp from a sequence of digital pulses present on the input side |
-
1984
- 1984-02-21 DE DE19843406143 patent/DE3406143C2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE3406143A1 (en) | 1985-08-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
OP8 | Request for examination as to paragraph 44 patent law | ||
D2 | Grant after examination | ||
8363 | Opposition against the patent | ||
8331 | Complete revocation |