GB470137A - Improvements in or relating to the reduction of ground noise in sound recording - Google Patents
Improvements in or relating to the reduction of ground noise in sound recordingInfo
- Publication number
- GB470137A GB470137A GB2473636A GB2473636A GB470137A GB 470137 A GB470137 A GB 470137A GB 2473636 A GB2473636 A GB 2473636A GB 2473636 A GB2473636 A GB 2473636A GB 470137 A GB470137 A GB 470137A
- Authority
- GB
- United Kingdom
- Prior art keywords
- light
- shutter
- film
- ground noise
- source
- 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
Abstract
470,137. Optical sound recording. ELLIS, G. B. (Klangfilm Ges.) Sept. 10, 1936, No. 24736. [Class 40 (ii)] An apparatus for recording sound on films with reduced ground noise is adapted to produce selectively either (1) a negative with reduced ground noise ready for direct reproduction, or (2) a negative from which are obtained positives with reduced ground noise for reproduction. In one form, Fig. 1, light from a source 11 passes through screen 17 and lens 19 to oscillating mirror 18 and thence through anti-groundnoise shutter 16, slot 15, and objective 13 to film 14, where a record of single-hump, doublehump, multiple-hump, or variable density is produced according to shape or nature of screen 17. The side of the shutter 16 facing the film is mirrored to reflect light from a source 12 or from the source 11 on to the film. In another form, Fig. 3, light from a source 1 passes through condenser 2 and screen 3 to recording element 4 and thence through prism 5, shutters 7, 8, and optical device 12 to film 13 ; and light from the same source 1 passes through condenser 2, prism 6, shutters 7, 8 and optical device 12 to film. The shutter 7 has separate slots 7<1>, 7<11> for the separate beams of light, and the shutter 8 has a wider slot 15, 16, Fig. 4, and is controlled by a device 9 for anti-ground-noise effect. Alternatively, the shutter 8 may be replaced by two separate shutters. In either form, when a negative free from ground noise ready for direct reproduction is desired, the second light beam is put in operation, and when a negative yielding positives free from ground noise is desired, the second light beam is switched off, deflected or shuttered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2473636A GB470137A (en) | 1936-09-10 | 1936-09-10 | Improvements in or relating to the reduction of ground noise in sound recording |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2473636A GB470137A (en) | 1936-09-10 | 1936-09-10 | Improvements in or relating to the reduction of ground noise in sound recording |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB470137A true GB470137A (en) | 1937-08-10 |
Family
ID=10216442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2473636A Expired GB470137A (en) | 1936-09-10 | 1936-09-10 | Improvements in or relating to the reduction of ground noise in sound recording |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB470137A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2885490A (en) * | 1954-12-22 | 1959-05-05 | Rca Corp | Direct positive sound recording system |
-
1936
- 1936-09-10 GB GB2473636A patent/GB470137A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2885490A (en) * | 1954-12-22 | 1959-05-05 | Rca Corp | Direct positive sound recording system |
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