GB921213A - Improvements in and relating to loudspeaker enclosures - Google Patents
Improvements in and relating to loudspeaker enclosuresInfo
- Publication number
- GB921213A GB921213A GB1076758A GB1076758A GB921213A GB 921213 A GB921213 A GB 921213A GB 1076758 A GB1076758 A GB 1076758A GB 1076758 A GB1076758 A GB 1076758A GB 921213 A GB921213 A GB 921213A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pipe
- acoustic
- acoustic resistance
- aperture
- resistance
- 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
- 238000012856 packing Methods 0.000 abstract 2
- 238000005192 partition Methods 0.000 abstract 2
- 238000010276 construction Methods 0.000 abstract 1
- 238000003780 insertion Methods 0.000 abstract 1
- 230000037431 insertion 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
- H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
- H04R1/2884—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure
- H04R1/2888—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure for loudspeaker transducers
-
- 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
- H04R1/2853—Enclosures comprising vibrating or resonating arrangements using an acoustic labyrinth or a transmission line
- H04R1/2857—Enclosures comprising vibrating or resonating arrangements using an acoustic labyrinth or a transmission line for loudspeaker transducers
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Abstract
921,213. Loud-speaker enclosures. J. S. MURRAY. April 3, 1959 [April 3, 1958; Aug. 5, 1958], Nos. 10767/58 and 25113/58. Class 40 (4). [Also in Group XXXVIII] A folded pipe having at one end an aperture in which to mount a sound-radiating diaphragm has its ends connected by an acoustic resistance having an impedance between one and sixteen times the characteristic impedance or average characteristic impedance of the pipe. A box 14, Fig. 4, has an aperture for insertion of a loudspeaker 12, and a partition 15 divides the box to provide a closed folded pipe construction. An aperture in the partition is fitted with an acoustic resistance 16 comprising screens, slots, holes or felt. Isothermalizing packing 17 is provided at one or both ends of the pipe. The pipe may be folded twice, Fig. 5. In another arrangement, in addition to an acoustic resistance 25, Fig. 6, connecting the ends of the pipe, there is an acoustic resistance 26 leading to free air mid-way along the acoustic length of the pipe, and one or more acoustic resistances 27, leading to free air, at the end of the pipe remote from the loud-speaker 24. Acoustic resistance 28 leads to a restricted space. The ratios of resistances 25, 26, 27, 28 are 4 : 1 : 2 : 4, resistance 26 being approximately equal to the characteristic impedance of the pipe. Packing 32 having its grain parallel with the length of the pipe improves the constancy of the cross-section of the pipe and damps high frequencies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1076758A GB921213A (en) | 1958-04-03 | 1958-04-03 | Improvements in and relating to loudspeaker enclosures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1076758A GB921213A (en) | 1958-04-03 | 1958-04-03 | Improvements in and relating to loudspeaker enclosures |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB921213A true GB921213A (en) | 1963-03-13 |
Family
ID=9973871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1076758A Expired GB921213A (en) | 1958-04-03 | 1958-04-03 | Improvements in and relating to loudspeaker enclosures |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB921213A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2298758A (en) * | 1995-03-09 | 1996-09-11 | Prima Dev Ltd | Transmission line enclosure |
| EP4246999A4 (en) * | 2020-11-13 | 2024-04-03 | Panasonic Intellectual Property Corporation of America | Audio device |
-
1958
- 1958-04-03 GB GB1076758A patent/GB921213A/en not_active Expired
Cited By (3)
| 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 |
| EP4246999A4 (en) * | 2020-11-13 | 2024-04-03 | Panasonic Intellectual Property Corporation of America | Audio device |
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