GB393610A - Improvements in and relating to the recording of sound on films - Google Patents
Improvements in and relating to the recording of sound on filmsInfo
- Publication number
- GB393610A GB393610A GB3329731A GB3329731A GB393610A GB 393610 A GB393610 A GB 393610A GB 3329731 A GB3329731 A GB 3329731A GB 3329731 A GB3329731 A GB 3329731A GB 393610 A GB393610 A GB 393610A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sound
- traces
- slit
- record
- aperture
- 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
- Optical Recording Or Reproduction (AREA)
Abstract
393,610. Recording sound optically. PETERSEN, A. C. G., 183, Norrebrogade, Copenhagen, POULSEN, A., 7, Hoyrups Alle, Hellerup, near Copenhagen, and BRITISH ACOUSTIC FILMS, Ltd., Film House, Wardour Street, London. Dec. 1, 1931, Nos. 33297 and 33298. [Class 40 (ii).] A variable width constant density record of sound is made in the form of two or more traces which are symmetrical about a longitudinal axis and have their zero or middle lines displaced from that axis, or an axis parallel thereto, proportionately to the volume of the sound recorded. Errors in reproduction due to background noise from excess of transparent portion of film and lack of accurate lateral adjustment of the film in relation to the slit are thereby reduced. Fig. 1 shows a recording apparatus for producing the record shown in Fig. 4. Light from source S is directed through triangular aperture b on to an oscillograph mirror m which reflects an image of the aperture on to a screen D having a slit d through which the beam passes to the film F. The beam is modulated by the sound to produce two wavy traces and is further modulated by a rectified component of the sound current so that the zero or mid lines of the traces are displaced from a longitudinal axis between the traces proportionately to the intensity of the sound as shown in Fig. 4. One of the modulating effects may be applied to movement of the mirror and the other to movement of the diaphragm B with the triangular aperture b or of the slit plate D or of a second mirror in the path of the beam. Alternatively, the whole modulation may be applied to movement of the oscillograph mirror. The apex of the triangular aperture may be replaced by a narrow parallel slit to avoid errors in the record when the apex is aligned with the slit. In a modification, the plate B is provided with two sideby-side triangular apertures and the record shown in Fig. 7 is then produced. Fig. 9 shows the record produced when the aperture is formed by three side-by-side triangular apertures. In this case, the outer apertures produce parallel records of the outer ends of the traces at their greatest amplitude. Specifications 377,675 and 380,850 are referred to.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3329731A GB393610A (en) | 1931-12-01 | 1931-12-01 | Improvements in and relating to the recording of sound on films |
| DK48475D DK48475C (en) | 1931-12-01 | 1932-09-19 | Film med Lydskrift efter Amplitudemetoden og Fremgangsmaade til Fremstilling af saadanne Films. |
| DE1932P0066209 DE700267C (en) | 1931-12-01 | 1932-10-14 | Method for making optical tone records in multiple serrated script |
| AT144556D AT144556B (en) | 1931-12-01 | 1932-11-03 | Sound film and process for its production. |
| CH167553D CH167553A (en) | 1931-12-01 | 1932-11-14 | Sound film and method of photographic recording of sounds. |
| NL63314A NL42079C (en) | 1931-12-01 | 1932-11-24 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3329731A GB393610A (en) | 1931-12-01 | 1931-12-01 | Improvements in and relating to the recording of sound on films |
| GB3329831 | 1931-12-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB393610A true GB393610A (en) | 1933-06-01 |
Family
ID=1803081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3329731A Expired GB393610A (en) | 1931-12-01 | 1931-12-01 | Improvements in and relating to the recording of sound on films |
Country Status (6)
| Country | Link |
|---|---|
| AT (1) | AT144556B (en) |
| CH (1) | CH167553A (en) |
| DE (1) | DE700267C (en) |
| DK (1) | DK48475C (en) |
| GB (1) | GB393610A (en) |
| NL (1) | NL42079C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2937915A (en) * | 1955-12-19 | 1960-05-24 | United Geophysical Corp | Recording system |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE940377C (en) * | 1932-04-09 | 1956-03-15 | Telefunken Gmbh | Process for producing background noise-free optical sound recordings in multi-point script |
| DE746290C (en) * | 1940-05-24 | 1944-06-15 | Tobis Tonbild Syndikat G M B H | Optical sound film |
-
1931
- 1931-12-01 GB GB3329731A patent/GB393610A/en not_active Expired
-
1932
- 1932-09-19 DK DK48475D patent/DK48475C/en active
- 1932-10-14 DE DE1932P0066209 patent/DE700267C/en not_active Expired
- 1932-11-03 AT AT144556D patent/AT144556B/en active
- 1932-11-14 CH CH167553D patent/CH167553A/en unknown
- 1932-11-24 NL NL63314A patent/NL42079C/xx active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2937915A (en) * | 1955-12-19 | 1960-05-24 | United Geophysical Corp | Recording system |
Also Published As
| Publication number | Publication date |
|---|---|
| CH167553A (en) | 1934-02-28 |
| AT144556B (en) | 1936-02-10 |
| DE700267C (en) | 1940-12-17 |
| NL42079C (en) | 1937-10-26 |
| DK48475C (en) | 1934-03-05 |
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