DE752950C - Arrangement for monitoring the symmetry in the reproduction of push-pull sound recordings - Google Patents
Arrangement for monitoring the symmetry in the reproduction of push-pull sound recordingsInfo
- Publication number
- DE752950C DE752950C DEU14650D DEU0014650D DE752950C DE 752950 C DE752950 C DE 752950C DE U14650 D DEU14650 D DE U14650D DE U0014650 D DEU0014650 D DE U0014650D DE 752950 C DE752950 C DE 752950C
- Authority
- DE
- Germany
- Prior art keywords
- push
- symmetry
- arrangement
- pull
- monitoring
- 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
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
Landscapes
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Description
Bei der Wiedergabe von Gegentakttonaufzeichnungen ist ein genauer Abgleich (Symmetrie) der beiden Photozellenkreise von großer Wichtigkeit. Bei gewöhnlichen Gegentaktaufzeichnungen (Gegentakt -A-Schrift) würde sonst die erwünschte Kompensation der durch die photographischen Prozesse hervorgerufenen Verzerrungen verhindert werden. Bei Aufzeichnungen in Halbwellenschrift (Gegentakt-B-Schrift) würden durch Ungleichheit der beiden Halbwellen darüber hinaus noch starke Verzerrungen entstehen.When playing push-pull sound recordings, a more accurate one Balancing (symmetry) of the two photocell circuits is of great importance. With ordinary Push-pull recordings (push-pull A script) would otherwise provide the desired compensation the distortion caused by the photographic processes will. For recordings in half-wave writing (push-pull B-writing), Inequality of the two half-waves, moreover, strong distortions arise.
Der Abgleich der beiden Photozellenkreise mit bekannten optischen oder elektrischen Hilfsmitteln kann so erfolgen, daß bei der Wiedergabe einer Gegentaktaufzeichnung subjektiv auf die beste Wiedergabequalität eingestellt wird. Diese subjektive Methode ist naturgemäß unzureichend. Erfindungsgemäß wird daher eine Anordnung zur objektiven Symmetrieeinstellung und Überwachung vorgeschlagen, die an Hand des in der Abbildung gezeigten Ausführungsbeispiels erläutert sei.The comparison of the two photocell circuits with known optical or electrical aids can be done so that when playing a push-pull recording is subjectively set to the best reproduction quality. This subjective method is naturally insufficient. According to the invention, therefore, an arrangement for the objective Symmetry adjustment and monitoring suggested based on the one shown in the figure Shown embodiment is explained.
Die beiden Photozellen i und 2 sind an je eine Gegentaktwicklung :4 und 5 des Gegentakttransformators 3 angeschlossen, dessen Sekundärwicklung 6 die Steuerspannung für den Wiedergabeverstärker liefert. Es ist für das Wesen der Erfindung gleichgültig, ob die Photozellen unmittelbar oder über je einen Verstärkerkanal auf den Transformator 3 geschaltet sind. Die beiden Photozellen bzw. die von ihnen gesteuerten Verstärker erzeugen in den Wicklungen 4 und 5 Spannungen, die bei richtiger Symmetrierung, d. h. für eine bestmögliche Wiedergabe, genau gleiche Werte haben müssen. Zur Überwachung dieser Bedingung werden gemäß der Erfindung in den Punkten .d und B über die Kondensatoren i i und 12 an die Gegentaktwicklungen zwei Gleichrichterkreise angeschlossen, die aus je einer Drossel 9 bzw. io, dem Strommeßgerät 13 und je einem Gleichrichter 7 bzw. 8 bestehen. Die beiden Gleichrichter haben in bezug auf das Strommeßgerät 13 entgegengesetzte Durchlaßrichtung, das Strommeßgerät 13 ist ein Nullinstrument, das seinen Nullpunkt in der Mitte der Skala hat. In den beiden Gleichrichterkreisen fließen Ströme, die den Amplituden der an den entsprechenden Gegentaktwicklungen auftretenden Spannungen proportional sind. Das Strommeßgerät 13, das in dem Differenzstromzweig beider Kreise liegt, zeigt die Unterschiede der beiden Ströme und somit auch die Unterschiede der an den Gegentaktwicklungen liegenden Spannungen nach Größe und Richtung durch einen entsprechenden Zeigerausschlag nach der einen oder anderen Seite an.The two photocells i and 2 are each connected to a push-pull winding: 4 and 5 of the push-pull transformer 3 connected, the secondary winding 6 of which Provides control voltage for the playback amplifier. It is for the essence of the invention It does not matter whether the photocells are directly or via an amplifier channel each are connected to the transformer 3. The two photocells or that of them controlled amplifiers generate voltages in windings 4 and 5, which when correct Balancing, d. H. have exactly the same values for the best possible reproduction have to. To monitor this condition are according to the invention in the points .d and B via the capacitors i i and 12 to the push-pull windings two rectifier circuits connected, each consisting of a choke 9 or io, the ammeter 13 and one each Rectifiers 7 and 8 exist. The two rectifiers have with respect to that Ammeter 13 opposite forward direction, the ammeter 13 is a Zero instrument that has its zero point in the middle of the scale. In the two rectifier circuits Currents flow which correspond to the amplitudes of the corresponding push-pull windings occurring voltages are proportional. The ammeter 13, which is in the differential current branch of both circles shows the differences between the two currents and thus also the Differences in the voltages on the push-pull windings according to size and Direction by a corresponding pointer deflection one way or the other Side on.
Die Symmetrierung der beiden Photozellenkreise wird man also praktisch mit dieser Anordnung so vornehmen, daß während der Wiedergabe das Meßgerät 13 durch `'erändern der Empfindlichkeit eines Photozellenkreises auf seinen Nullpunkt eingestellt wird.The balancing of the two photocell circuits becomes practical make with this arrangement so that during playback, the measuring device 13 through '' change the sensitivity of a photocell circuit set to its zero point will.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEU14650D DE752950C (en) | 1939-02-28 | 1939-02-28 | Arrangement for monitoring the symmetry in the reproduction of push-pull sound recordings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEU14650D DE752950C (en) | 1939-02-28 | 1939-02-28 | Arrangement for monitoring the symmetry in the reproduction of push-pull sound recordings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE752950C true DE752950C (en) | 1954-05-03 |
Family
ID=7568688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEU14650D Expired DE752950C (en) | 1939-02-28 | 1939-02-28 | Arrangement for monitoring the symmetry in the reproduction of push-pull sound recordings |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE752950C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB406744A (en) * | 1932-07-08 | 1934-03-08 | Ernest Yeoman Robinson | Improvements relating to circuits including thermionic valves for the amplification of electric signals |
| DE641365C (en) * | 1934-06-05 | 1937-01-29 | Telefunken Gmbh | DF receiver for directing aircraft using the dot-dash method |
-
1939
- 1939-02-28 DE DEU14650D patent/DE752950C/en not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB406744A (en) * | 1932-07-08 | 1934-03-08 | Ernest Yeoman Robinson | Improvements relating to circuits including thermionic valves for the amplification of electric signals |
| DE641365C (en) * | 1934-06-05 | 1937-01-29 | Telefunken Gmbh | DF receiver for directing aircraft using the dot-dash method |
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