GB360940A - Improvements in or relating to talking films - Google Patents
Improvements in or relating to talking filmsInfo
- Publication number
- GB360940A GB360940A GB2354930A GB2354930A GB360940A GB 360940 A GB360940 A GB 360940A GB 2354930 A GB2354930 A GB 2354930A GB 2354930 A GB2354930 A GB 2354930A GB 360940 A GB360940 A GB 360940A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sound
- film
- records
- currents
- cells
- 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
- Projection-Type Copiers In General (AREA)
Abstract
360,940. Optical sound-recording and sound-reproducing apparatus. KONEMANN, H., 4, Gereonstrasse, Munster, Westphalia, Germany. Aug. 6, 1930, No. 23549. [Class 40 (iil.] Sound is recorded on a film by using two light sources, the intensity of which is modulated in accordance with the sound, in such a manner as to produce side by side on the film two records which are 180‹ out of phase. Reproduction is effected from these records by causing them simultaneously to influence a light beam acting on two photo-electric cells, these being preferably used in conjunction with a push-pull amplifier to operate a loud-speaker. It is stated that with this arrangement, errors produced by fogging of the film or curvature of the photographic characteristic curve may be avoided, and a weaker average exposure may be given to the film. The recording apparatus shown in Fig. 1 comprises two lamps L<1>, L<2> supplied with direct current from the mains through choke coils D<1> D<2>. Microphone currents are superposed through a transformer T on the currents in the lamps, the connections being such that as the current in one lamp is increased that in the other is decreased. By means of a suitable optical system C, S, O, two sound records which have a phase displacement of 180‹ are thus produced at a, b on a photographic film F. Fig. 3 shows an apparatus for reproducing sound from such records. Light is transmitted from a lamp L<3> through both records a, b on the film F simultaneously, and the two modulated beams thus produced are reflected on to photo-electric cells Z<1>, Z<2> respectively. These cells are connected symmetrically in known manner with a system of valves R<1>.. R<4>, so that the amplified currents are combined in an output transformer and operate a loud-speaker L. As an alternative, the currents of the two cells could be combined by means of a transformer and transmitted to an ordinary amplifier. Reference has been directed by the Comptroller to Specifications 329,405 and 332,197, [both in Class 40 (ii), Phonographs &c.].
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2354930A GB360940A (en) | 1930-08-06 | 1930-08-06 | Improvements in or relating to talking films |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2354930A GB360940A (en) | 1930-08-06 | 1930-08-06 | Improvements in or relating to talking films |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB360940A true GB360940A (en) | 1931-11-06 |
Family
ID=10197445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2354930A Expired GB360940A (en) | 1930-08-06 | 1930-08-06 | Improvements in or relating to talking films |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB360940A (en) |
-
1930
- 1930-08-06 GB GB2354930A patent/GB360940A/en not_active Expired
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