GB547922A - Sound absorbing apparatus - Google Patents
Sound absorbing apparatusInfo
- Publication number
- GB547922A GB547922A GB5719/41A GB571941A GB547922A GB 547922 A GB547922 A GB 547922A GB 5719/41 A GB5719/41 A GB 5719/41A GB 571941 A GB571941 A GB 571941A GB 547922 A GB547922 A GB 547922A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sound
- horn
- measuring
- intensity
- tapered
- 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
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/002—Devices for damping, suppressing, obstructing or conducting sound in acoustic devices
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
547,922. Loud-speakers ; measuring sound intensity. STANDARD TELEPHONES & CABLES, Ltd. May 2, 1941, No. 5719. Convention date, July 17, 1940. [Classes 13 and 118 (ii)] [Also in Group XXXIX] In a method of absorbing sound waves, e.g. at the back of a loud-speaker diaphragm, or in apparatus for measuring the intensity of sound the sound waves are transformed from their natural velocity to a high-particle velocity and then absorbed. This may be done by a tapered horn having sound absorbing material in its throat portion, or the walls of the horn may be of sound-absorbent material. The portion 34, Fig. 3, of the horn near the diaphragm 30 may be cylindrical for a distance not exceeding a quarter wave length of the lowest frequency to be absorbed, followed by a portion having a taper exceeding the exponential curve, and a third portion having an exponential taper. The horn may vary in cross-section from point to point, Figs. 2, 2A, 2B, or be coiled to reduce its length, or may be divided into a number of tapered portions by axial partitions, Fig. 5 (not shown). For measuring sound intensity, a microphone or Rayleigh disc may be mounted in an outer tube leading into a tapered horn, Fig. 1 (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US547922XA | 1940-07-17 | 1940-07-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB547922A true GB547922A (en) | 1942-09-17 |
Family
ID=21993567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5719/41A Expired GB547922A (en) | 1940-07-17 | 1941-05-02 | Sound absorbing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB547922A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2290672A (en) * | 1995-09-08 | 1996-01-03 | B & W Loudspeakers | Loudspeaker systems |
| GB2298758A (en) * | 1995-03-09 | 1996-09-11 | Prima Dev Ltd | Transmission line enclosure |
| GB2350966A (en) * | 1999-06-10 | 2000-12-13 | Stefan Gamble | Internal acoustic energy control treatment for loudspeaker or microphone housings |
| EP2040483A2 (en) * | 2007-09-21 | 2009-03-25 | Laurence George Dickie | Ported loudspeaker enclosure with tapered waveguide absorber |
| GB2590785A (en) * | 2019-12-23 | 2021-07-07 | Gp Acoustics International Ltd | Loudspeakers |
-
1941
- 1941-05-02 GB GB5719/41A patent/GB547922A/en not_active Expired
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2298758A (en) * | 1995-03-09 | 1996-09-11 | Prima Dev Ltd | Transmission line enclosure |
| GB2298758B (en) * | 1995-03-09 | 1999-05-26 | Prima Dev Ltd | Loudspeaker systems and enclosures |
| GB2290672A (en) * | 1995-09-08 | 1996-01-03 | B & W Loudspeakers | Loudspeaker systems |
| GB2350966A (en) * | 1999-06-10 | 2000-12-13 | Stefan Gamble | Internal acoustic energy control treatment for loudspeaker or microphone housings |
| GB2350966B (en) * | 1999-06-10 | 2001-08-22 | Stefan Gamble | Loudspeaker cabinet and microphone housing internal energy control treatment |
| EP2040483A2 (en) * | 2007-09-21 | 2009-03-25 | Laurence George Dickie | Ported loudspeaker enclosure with tapered waveguide absorber |
| EP2040483A3 (en) * | 2007-09-21 | 2009-11-18 | Laurence George Dickie | Ported loudspeaker enclosure with tapered waveguide absorber |
| GB2590785A (en) * | 2019-12-23 | 2021-07-07 | Gp Acoustics International Ltd | Loudspeakers |
| GB2590656A (en) * | 2019-12-23 | 2021-07-07 | Gp Acoustics International Ltd | Loudspeakers |
| US11647326B2 (en) | 2019-12-23 | 2023-05-09 | Gp Acoustics International Limited | Loudspeakers |
| GB2590785B (en) * | 2019-12-23 | 2023-11-01 | Gp Acoustics International Ltd | Loudspeakers |
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