GB406749A - Improvements in or relating to telephone transmitters or receivers for transmitting, reproducing or recording sound waves - Google Patents
Improvements in or relating to telephone transmitters or receivers for transmitting, reproducing or recording sound wavesInfo
- Publication number
- GB406749A GB406749A GB2508532A GB2508532A GB406749A GB 406749 A GB406749 A GB 406749A GB 2508532 A GB2508532 A GB 2508532A GB 2508532 A GB2508532 A GB 2508532A GB 406749 A GB406749 A GB 406749A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diaphragm
- coil
- rings
- coils
- studs
- 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
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract 1
- 239000004411 aluminium Substances 0.000 abstract 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 1
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- 238000010276 construction Methods 0.000 abstract 1
- IDLFZVILOHSSID-OVLDLUHVSA-N corticotropin Chemical compound C([C@@H](C(=O)N[C@@H](CO)C(=O)N[C@@H](CCSC)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CC=1NC=NC=1)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CC=1C2=CC=CC=C2NC=1)C(=O)NCC(=O)N[C@@H](CCCCN)C(=O)N1[C@@H](CCC1)C(=O)N[C@@H](C(C)C)C(=O)NCC(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N1[C@@H](CCC1)C(=O)N[C@@H](C(C)C)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](C(C)C)C(=O)N[C@@H](CC=1C=CC(O)=CC=1)C(=O)N1[C@@H](CCC1)C(=O)N[C@@H](CC(N)=O)C(=O)NCC(=O)N[C@@H](C)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CC(O)=O)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CO)C(=O)N[C@@H](C)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](C)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N1[C@@H](CCC1)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CC=1C=CC=CC=1)C(O)=O)NC(=O)[C@@H](N)CO)C1=CC=C(O)C=C1 IDLFZVILOHSSID-OVLDLUHVSA-N 0.000 abstract 1
- 239000010985 leather Substances 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
- H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
406,749. Loud - speakers. MIDGLEY, A. H., c/o Midgley, Harmer, Ltd., Dukes Road, Western Avenue, North Acton, London. Sept. 8, 1932, No. 25085. [Class 40 (iv).] A sound reproducing or a sound recording or transmitting device comprises a flat and preferably stretched diaphragm provided with two or more concentric moving coils which are immersed in annular gaps of a common magnetic field system, each coil being arranged to generate, or to be sensitive to, different modes of vibration of the diaphragm according to the frequency impressed thereon. The Figure shows a construction of loud-speaker comprising a flat diaphragm c driven by concentric coils a, b located in the gaps of a common magnet system d, e, f, the centres of the coils coinciding with the centre of the diaphragm as shown or being displaced therefrom by any distance up to about 1/5 of the radius of the diaphragm. The coil a is preferably wound with aluminium wire and the coil b with copper wire, the two coils being connected in series and an inductance is connected across coil a and a capacity across coil b so that the high frequencies are diverted through coil a but do not traverse coil b. The diaphragm c, which may be in the form of a disc or have a square or oblong outline, is mounted as described in Specification 332,272, [Class 40 (iv)], by stretching it over or fixing its periphery to a ring or rings g movably supported on three studs h. The holes in the rings through which the studs pass are preferably bushed with leather, felt &c. i while felt rings or stops l may be provided on the studs to limit the movement of the rings thereon. The arrangement is such that at low frequencies the diaphragm and inertia weight will vibrate as a whole, but at the higher frequencies only the centre of the diaphragm will vibrate. The magnet system may be provided with vent holes as shown.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2508532A GB406749A (en) | 1932-09-08 | 1932-09-08 | Improvements in or relating to telephone transmitters or receivers for transmitting, reproducing or recording sound waves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2508532A GB406749A (en) | 1932-09-08 | 1932-09-08 | Improvements in or relating to telephone transmitters or receivers for transmitting, reproducing or recording sound waves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB406749A true GB406749A (en) | 1934-03-08 |
Family
ID=10221949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2508532A Expired GB406749A (en) | 1932-09-08 | 1932-09-08 | Improvements in or relating to telephone transmitters or receivers for transmitting, reproducing or recording sound waves |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB406749A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3937905A (en) * | 1972-07-25 | 1976-02-10 | Manger J W | Moving voice coil transducer having a flat diaphragm of an impregnated knit |
| GB2193413A (en) * | 1985-12-10 | 1988-02-03 | Reefgrade Limited | Electromechanical transducer |
| GB2194707A (en) * | 1985-12-10 | 1988-03-09 | Reefgrade Limited | Electromechanical transducer |
| US9369800B2 (en) | 2013-09-26 | 2016-06-14 | Motorola Solutions, Inc. | Intrinsically safe audio circuit for a portable two-way radio |
-
1932
- 1932-09-08 GB GB2508532A patent/GB406749A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3937905A (en) * | 1972-07-25 | 1976-02-10 | Manger J W | Moving voice coil transducer having a flat diaphragm of an impregnated knit |
| GB2193413A (en) * | 1985-12-10 | 1988-02-03 | Reefgrade Limited | Electromechanical transducer |
| GB2194707A (en) * | 1985-12-10 | 1988-03-09 | Reefgrade Limited | Electromechanical transducer |
| US9369800B2 (en) | 2013-09-26 | 2016-06-14 | Motorola Solutions, Inc. | Intrinsically safe audio circuit for a portable two-way radio |
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