KE3554A - Electro-acoustic calling devices - Google Patents
Electro-acoustic calling devicesInfo
- Publication number
- KE3554A KE3554A KE3554A KE355485A KE3554A KE 3554 A KE3554 A KE 3554A KE 3554 A KE3554 A KE 3554A KE 355485 A KE355485 A KE 355485A KE 3554 A KE3554 A KE 3554A
- Authority
- KE
- Kenya
- Prior art keywords
- housing
- electro
- calling devices
- aperture
- intensity
- Prior art date
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
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Devices For Supply Of Signal Current (AREA)
- Telephone Set Structure (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
- Headphones And Earphones (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
An electro-acoustic transducer (2) mounted in a housing (5, 6) in which a volume control is provided by an aperture (7) in the front of the housing (5) and a rotatable shutter plate (11) which is mounted on the front of the housing (5) and which has a plurality of smaller apertures (14). The smaller apertures (14) are positioned in such a way that linear movement of the shutter plate (11) causes a logarithmic change in the exposure of the aperture (7) in the front of the housing (5) to give a logarithmic change in the intensity of the sound output such that the linear movement causes an apparent linear change in the intensity of sound as heard by a human ear.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8205748 | 1982-02-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KE3554A true KE3554A (en) | 1985-08-30 |
Family
ID=10528646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KE3554A KE3554A (en) | 1982-02-26 | 1985-08-07 | Electro-acoustic calling devices |
Country Status (15)
| Country | Link |
|---|---|
| EP (1) | EP0087908B1 (en) |
| JP (1) | JPS58159099A (en) |
| AT (1) | ATE16879T1 (en) |
| AU (1) | AU549945B2 (en) |
| CA (1) | CA1215163A (en) |
| DE (1) | DE3361370D1 (en) |
| DK (1) | DK78383A (en) |
| GB (1) | GB2115648B (en) |
| HK (1) | HK79485A (en) |
| IL (1) | IL67935A (en) |
| KE (1) | KE3554A (en) |
| MY (1) | MY8600266A (en) |
| NZ (1) | NZ203265A (en) |
| ZA (1) | ZA831054B (en) |
| ZW (1) | ZW5283A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2168875A (en) * | 1984-12-19 | 1986-06-25 | Philips Electronic Associated | Electroacoustic calling device |
| AT400910B (en) * | 1994-06-16 | 1996-04-25 | Akg Akustische Kino Geraete | ACOUSTIC RESISTANCE, ESPECIALLY FOR ELECTROACOUSTIC TRANSDUCERS |
| US6124992A (en) * | 1995-02-08 | 2000-09-26 | Seagate Technology Llc | System and method for reconstructing a signal wave in a partial response read channel |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1884724A (en) * | 1923-06-19 | 1932-10-25 | Western Electric Co | Sound box for phonic diaphragms |
| US3826333A (en) * | 1973-03-21 | 1974-07-30 | J Buckwalter | Baffle for a sound producing device |
| FR2273335B1 (en) * | 1974-05-31 | 1979-05-25 | Klaxon Sa | |
| GB2082018B (en) * | 1980-07-31 | 1983-10-12 | Standard Telephones Cables Ltd | Telephone sounder |
-
1983
- 1983-02-14 NZ NZ203265A patent/NZ203265A/en unknown
- 1983-02-16 CA CA000421729A patent/CA1215163A/en not_active Expired
- 1983-02-16 AU AU11492/83A patent/AU549945B2/en not_active Ceased
- 1983-02-16 IL IL67935A patent/IL67935A/en unknown
- 1983-02-16 ZA ZA831054A patent/ZA831054B/en unknown
- 1983-02-22 EP EP83300910A patent/EP0087908B1/en not_active Expired
- 1983-02-22 AT AT83300910T patent/ATE16879T1/en active
- 1983-02-22 DE DE8383300910T patent/DE3361370D1/en not_active Expired
- 1983-02-22 DK DK78383A patent/DK78383A/en not_active Application Discontinuation
- 1983-02-23 GB GB08305038A patent/GB2115648B/en not_active Expired
- 1983-02-25 JP JP58030642A patent/JPS58159099A/en active Pending
- 1983-02-25 ZW ZW52/83A patent/ZW5283A1/en unknown
-
1985
- 1985-08-07 KE KE3554A patent/KE3554A/en unknown
- 1985-10-17 HK HK794/85A patent/HK79485A/en unknown
-
1986
- 1986-12-30 MY MY266/86A patent/MY8600266A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ZA831054B (en) | 1984-03-28 |
| GB8305038D0 (en) | 1983-03-30 |
| JPS58159099A (en) | 1983-09-21 |
| IL67935A0 (en) | 1983-06-15 |
| MY8600266A (en) | 1986-12-31 |
| HK79485A (en) | 1985-10-25 |
| GB2115648A (en) | 1983-09-07 |
| NZ203265A (en) | 1985-04-30 |
| IL67935A (en) | 1986-04-29 |
| EP0087908A1 (en) | 1983-09-07 |
| GB2115648B (en) | 1985-03-13 |
| CA1215163A (en) | 1986-12-09 |
| AU1149283A (en) | 1983-09-01 |
| ZW5283A1 (en) | 1983-05-11 |
| DE3361370D1 (en) | 1986-01-16 |
| DK78383D0 (en) | 1983-02-22 |
| DK78383A (en) | 1983-08-27 |
| AU549945B2 (en) | 1986-02-20 |
| EP0087908B1 (en) | 1985-12-04 |
| ATE16879T1 (en) | 1985-12-15 |
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