GB447205A - Improvements in or relating to the recording and reproduction of impulses such as those of audio frequency - Google Patents
Improvements in or relating to the recording and reproduction of impulses such as those of audio frequencyInfo
- Publication number
- GB447205A GB447205A GB34342/34A GB3434234A GB447205A GB 447205 A GB447205 A GB 447205A GB 34342/34 A GB34342/34 A GB 34342/34A GB 3434234 A GB3434234 A GB 3434234A GB 447205 A GB447205 A GB 447205A
- Authority
- GB
- United Kingdom
- Prior art keywords
- damping
- instrument
- turbulence
- diaphragm
- response
- 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
Landscapes
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
Abstract
447,205. Diaphragms. RADIO CORPORATION OF AMERICA, 30, Rockefeller Plaza, New York, U.S.A. Nov. 29, 1934, No. 34342. Convention date, Dec. 28, 1933. [Class 40 iv] Sound reproducing or recording devices are provided with means for producing " turbulence damping," i.e. the damping produced by causing a turbulent motion in a fluid such as air. Such damping is proportional to the cube of the air velocity and so, in the neighbourhood of the resonance frequency of the instrument concerned, reduces the response to high level vibrations to a much greater extent than that to low level vibrations. The Figure shows an instrument in which a mirror is controlled by a diaphragm 20 for making an optical record. The space behind the diaphragm is, in order to produce " turbulence damping," closed by a thin perforated sheet 25. A similar instrument not forming part of the invention has a comparatively thick porous back instead of the sheet 25. This arrangement gives an approximation to viscous damping. Reference is made to a cutter in which the response at the upper and lower ends of the spectrum depends primarily on mass and stiffness respectively and in the region 2000 ... 4000 depends on turbulence damping. No constructional details are given.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US447205XA | 1933-12-28 | 1933-12-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB447205A true GB447205A (en) | 1936-05-14 |
Family
ID=21933955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB34342/34A Expired GB447205A (en) | 1933-12-28 | 1934-11-29 | Improvements in or relating to the recording and reproduction of impulses such as those of audio frequency |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB447205A (en) |
-
1934
- 1934-11-29 GB GB34342/34A patent/GB447205A/en not_active Expired
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