GB1423457A - Acoustical impedance matching device in combination with an electro-acoustic transducer - Google Patents
Acoustical impedance matching device in combination with an electro-acoustic transducerInfo
- Publication number
- GB1423457A GB1423457A GB2794173A GB2794173A GB1423457A GB 1423457 A GB1423457 A GB 1423457A GB 2794173 A GB2794173 A GB 2794173A GB 2794173 A GB2794173 A GB 2794173A GB 1423457 A GB1423457 A GB 1423457A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transducer
- aperture
- chamber
- matching device
- acoustic
- 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
- G10K11/02—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S181/00—Acoustics
- Y10S181/40—Wave coupling
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
1423457 Acoustic matching devices; transducers MOTOROLA Inc 12 June 1973 [28 June 1972] 27941/73 Headings H4X and H4J In sound reproducing apparatus an acoustic impedance matching device 34 (Figs. 2, 6) includes an acoustic chamber 56 acoustically coupled, e.g. by rubber tube 33, to a transducer 29. An aperture 60 in the chamber 56 is for exit of sound waves from the chamber 56 and develops a sound wave pressure in the chamber 56 to provide an acoustic impedance match between the transducer 29 and the outer air. A passage 62 is coupled to the aperture 60 for emission of sound waves. The cross-sectional area of passage 62 increases exponentially until it reaches an output aperture 62. The application is to a radio pager (Fig. 1) where a large acoustic horn 20 is not required, the sound output coming from outlets 16. A shirt pocket clip 11 is provided, together with a switch 15. A housing 10 has a U-shaped cover 17. Housing 10 contains, in addition to the impedance matching device 34 and transducer 29, a printed circuit board 25 of a radio receiver having various components 26 and a battery 27. in a holder 28. Printed circuit board can be removed and replaced in housing 10. The tube 33 has a groove (42) Fig. 7 (not shown) by which it is held captive in the matching device 34. The transducer 29 (Fig. 8) includes a drive unit 25 behind an aperture 36 leading to a spiral passage 32. A cover 31 (Fig. 2) of the transducer 29 has an aperture 30 which in the assembled condition is covered by tube 33.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00266855A US3805915A (en) | 1972-06-28 | 1972-06-28 | Acoustical impedance matching device for a high impedance transducer |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1423457A true GB1423457A (en) | 1976-02-04 |
Family
ID=23016258
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2794173A Expired GB1423457A (en) | 1972-06-28 | 1973-06-12 | Acoustical impedance matching device in combination with an electro-acoustic transducer |
Country Status (3)
Country | Link |
---|---|
US (1) | US3805915A (en) |
CA (1) | CA976882A (en) |
GB (1) | GB1423457A (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4525872A (en) * | 1983-06-27 | 1985-06-25 | Zochowski John S | Amplifier |
US4775083A (en) * | 1987-02-02 | 1988-10-04 | Motorola, Inc. | Portable radio carrying case |
GB9604140D0 (en) * | 1996-02-27 | 1996-05-01 | Spanswick Keith A | Radiation measuring apparatus |
US7733659B2 (en) * | 2006-08-18 | 2010-06-08 | Delphi Technologies, Inc. | Lightweight audio system for automotive applications and method |
US9247341B2 (en) * | 2014-02-26 | 2016-01-26 | Htc Corporation | Speaker module |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3249873A (en) * | 1963-05-22 | 1966-05-03 | Gen Motors Corp | Miniaturized helmet exponential horn speaker for a portable radio receiver |
-
1972
- 1972-06-28 US US00266855A patent/US3805915A/en not_active Expired - Lifetime
-
1973
- 1973-06-06 CA CA173,324A patent/CA976882A/en not_active Expired
- 1973-06-12 GB GB2794173A patent/GB1423457A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US3805915A (en) | 1974-04-23 |
AU5735273A (en) | 1975-01-09 |
CA976882A (en) | 1975-10-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |