GB391667A - Improvements in or relating to acoustic devices - Google Patents
Improvements in or relating to acoustic devicesInfo
- Publication number
- GB391667A GB391667A GB24862/32A GB2486232A GB391667A GB 391667 A GB391667 A GB 391667A GB 24862/32 A GB24862/32 A GB 24862/32A GB 2486232 A GB2486232 A GB 2486232A GB 391667 A GB391667 A GB 391667A
- Authority
- GB
- United Kingdom
- Prior art keywords
- layers
- sound
- unequally spaced
- spacing
- devices
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
- H04R1/342—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for microphones
Abstract
391,667. Acoustic and sound-magnifying devices. ELECTRICAL RESEARCH PRODUCTS, Inc., 195, Broadway, New York, U.S.A.-(Assignees of Bedell, E. H. ; 107, Passaic Avenue, Summit, New Jersey, U.S.A.) Sept. 6, 1932, No. 24862. Convention date, March 11. [Class 13.] Sound - absorbing devices for controlling the acoustics of studios, sound-chambers, directive sound shields or baffles, &c. comprise a number of unequally spaced layers or screens of cloth or other sounddampening material, the minimum air spacing between the layers being one half-inch and the total thickness of the device being equal to one quarter wavelength of the lowest frequency to be absorbed. As shown in Fig. 1, twelve layers 13 of canton flannel unequally spaced are arranged with seven layers 14 of muslin also unequally spaced, the spacing of the layers decreasing and then increasing from the interior of the room &c. A wire fireproof screen 10 is provided and the layers are hung from rods at the ceiling. Fig. 5 shows a baffle or horn for a microphone which is placed at the smaller end 33, the larger end 28 constituting the sound-receiving end. As shown, similar layers of material 39, 40 are arranged with outer padded layers or walls 36. 37.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US391667XA | 1932-03-11 | 1932-03-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB391667A true GB391667A (en) | 1933-05-04 |
Family
ID=21904017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB24862/32A Expired GB391667A (en) | 1932-03-11 | 1932-09-06 | Improvements in or relating to acoustic devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB391667A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1979555A2 (en) * | 2006-01-19 | 2008-10-15 | Siwei Zou | Apparatus for absorbing acoustical engery and use thereof |
-
1932
- 1932-09-06 GB GB24862/32A patent/GB391667A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1979555A2 (en) * | 2006-01-19 | 2008-10-15 | Siwei Zou | Apparatus for absorbing acoustical engery and use thereof |
| EP1979555A4 (en) * | 2006-01-19 | 2010-03-17 | Siwei Zou | Apparatus for absorbing acoustical engery and use thereof |
| US8191678B2 (en) | 2006-01-19 | 2012-06-05 | Se Electronics International, Inc. | Apparatus for absorbing acoustical energy and use thereof |
| EP2506251A1 (en) * | 2006-01-19 | 2012-10-03 | Siwei Zou | Apparatus for absorbing acoustical energy and use thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3076520A (en) | Loud speaker | |
| CN106470371A (en) | A kind of bone-conduction speaker that can suppress leakage sound | |
| FI811002L (en) | ANORDING FOR THE ABSORPTION OF AN ABSORPTION AVOID IN LOCAL | |
| US1972563A (en) | Acoustic construction | |
| GB391667A (en) | Improvements in or relating to acoustic devices | |
| US2276788A (en) | Building construction | |
| GB275571A (en) | Acoustic devices, such as loud speakers | |
| US2991840A (en) | Sound reproducer | |
| US3194339A (en) | Loudspeaker system | |
| GB698695A (en) | Improvements in or relating to microphones | |
| GB252002A (en) | Improvements in electro-dynamic devices adapted for use as microphones or loud-speaking apparatus | |
| GB506668A (en) | Improvements in and relating to microphones | |
| US2361652A (en) | Sound-absorbing control for acoustical units | |
| US1907712A (en) | Acoustic device | |
| US2006453A (en) | Acoustic device | |
| US1791173A (en) | Auditorium loud-speaker | |
| US1802480A (en) | Sound-amplifying apparatus | |
| GB611179A (en) | Improvements in and relating to acoustic instruments, such as loud speakers and directional microphones | |
| GB737635A (en) | Improvements in or relating to voice mufflers for telephone transmitters | |
| USRE20395E (en) | Method and apparatus for tone | |
| US1955800A (en) | Acoustic device | |
| GB318279A (en) | Improvements in moving coil microphones | |
| US1730826A (en) | Sound-translating chamber | |
| ES43971U (en) | An elementary and soundproof booth for verbal intercommunication (Machine-translation by Google Translate, not legally binding) | |
| US1833714A (en) | Radio loud speaker |