GB378286A - Improvements in or relating to loudspeakers - Google Patents
Improvements in or relating to loudspeakersInfo
- Publication number
- GB378286A GB378286A GB32973/31A GB3297331A GB378286A GB 378286 A GB378286 A GB 378286A GB 32973/31 A GB32973/31 A GB 32973/31A GB 3297331 A GB3297331 A GB 3297331A GB 378286 A GB378286 A GB 378286A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diaphragm
- damping material
- air chamber
- loud
- thickness
- 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
- 239000000463 material Substances 0.000 abstract 9
- 238000013016 damping Methods 0.000 abstract 5
- 239000011490 mineral wool Substances 0.000 abstract 2
- RNAMYOYQYRYFQY-UHFFFAOYSA-N 2-(4,4-difluoropiperidin-1-yl)-6-methoxy-n-(1-propan-2-ylpiperidin-4-yl)-7-(3-pyrrolidin-1-ylpropoxy)quinazolin-4-amine Chemical compound N1=C(N2CCC(F)(F)CC2)N=C2C=C(OCCCN3CCCC3)C(OC)=CC2=C1NC1CCN(C(C)C)CC1 RNAMYOYQYRYFQY-UHFFFAOYSA-N 0.000 abstract 1
- 238000010276 construction Methods 0.000 abstract 1
- 239000004744 fabric Substances 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000000717 retained effect Effects 0.000 abstract 1
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
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2861—Enclosures comprising vibrating or resonating arrangements using a back-loaded horn
- H04R1/2865—Enclosures comprising vibrating or resonating arrangements using a back-loaded horn for loudspeaker transducers
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Abstract
378,286. Loud-speakers. KIRKE, H. L., 53, Rodenhurst Road, Clapham Park, London, HOWE, A. B., Shaldon, Hill View Road, Hatch End, Middlesex, and BARRETT, A. E., 62, Lessar Avenue, Clapham Common, London. Nov. 27, 1931, No. 32973. [Class 40 (iv).] A loud-speaker comprises a diaphragm having associated with one side thereof an air chamber flaring from the diaphragm outwards and wholly or partially bounded by sound-damping material of such nature and thickness that a large proportion of the sound energy of lower frequencies falling upon this material is absorbed thereby. The material is of a fibrous nature, such as slag wool or rock wool and is retained in position by material offering little obstruction to the passage of sound waves, such as wire mesh covered with thick muslin. The thickness of the material in the neighbourhood of the diaphragm is preferably of the same order as the diameter of the diaphragm. Fig. 2 shows a construction of loud-speaker having a diaphragm 1 mounted in an aperture in the front wall 2 of a box the back of which is left open and the inside of which is lined with a thick layer of damping material 3. The crosssectional area of the air chamber thus formed increases approximately logarithmically from the diaphragm outwards. If desired, the back of the air chamber may be covered either with a thick layer of damping material or by a thin fabric. A flared air column may also be provided on both sides of the diaphragm, the rates of flare and the inlet areas of the two chambers being the same or different. According to a further modification, Fig. 3, the top and bottom of the box are omitted as well as the back and the two sides are lined with damping material to form a trough-shaped air chamber. The thickness of the damping material at the front wall 2 may be made greatest in the neighbourhood of the diaphragm as indicated by the dotted lines. In this arrangement, the height of the structure is preferably made considerably greater than its breadth and the sides thereof may be hinged to the front.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB36020/32A GB402600A (en) | 1931-11-27 | 1931-11-27 | Improvements in or relating to loudspeakers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB378286A true GB378286A (en) | 1932-08-11 |
Family
ID=10384069
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB32973/31A Expired GB378286A (en) | 1931-11-27 | 1931-11-27 | Improvements in or relating to loudspeakers |
| GB36020/32A Expired GB402600A (en) | 1931-11-27 | 1931-11-27 | Improvements in or relating to loudspeakers |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB36020/32A Expired GB402600A (en) | 1931-11-27 | 1931-11-27 | Improvements in or relating to loudspeakers |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US1930757A (en) |
| GB (2) | GB378286A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2290672A (en) * | 1995-09-08 | 1996-01-03 | B & W Loudspeakers | Loudspeaker systems |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NZ225001A (en) * | 1987-06-16 | 1990-09-26 | Matsushita Electric Ind Co Ltd | Loudspeaker: reflected sound waves absorbed |
| ES2050178T3 (en) * | 1988-04-28 | 1994-05-16 | Matsushita Electric Ind Co Ltd | SPEAKER SYSTEM. |
| US6658131B2 (en) | 2001-03-06 | 2003-12-02 | James T. Smith | Loudspeaker concealment system |
-
1931
- 1931-11-27 GB GB32973/31A patent/GB378286A/en not_active Expired
- 1931-11-27 GB GB36020/32A patent/GB402600A/en not_active Expired
-
1932
- 1932-11-09 US US641908A patent/US1930757A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2290672A (en) * | 1995-09-08 | 1996-01-03 | B & W Loudspeakers | Loudspeaker systems |
Also Published As
| Publication number | Publication date |
|---|---|
| GB402600A (en) | 1933-12-07 |
| US1930757A (en) | 1933-10-17 |
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