GB408221A - Improvements in or relating to telephone transmitters for use in telephoning, public address systems, and sound recording - Google Patents
Improvements in or relating to telephone transmitters for use in telephoning, public address systems, and sound recordingInfo
- Publication number
- GB408221A GB408221A GB2746032A GB2746032A GB408221A GB 408221 A GB408221 A GB 408221A GB 2746032 A GB2746032 A GB 2746032A GB 2746032 A GB2746032 A GB 2746032A GB 408221 A GB408221 A GB 408221A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transmitter
- sound
- transmitters
- passages
- public address
- 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
-
- 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
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Telephone Set Structure (AREA)
Abstract
408,221. Transmitters. STEUART, D. S. S., and STEUART, M. S., St. Mark's House, St. Mark's Square, Regent's Park, London. Oct. 3, 1932, Nos. 27460/32 and 22694/33. [Class 40 (iv).] A transmitter 2, Fig. 9, for use in telephone, public address and sound recording systems and the like comprises a pair of diaphragms 3, 4 responsive to different audio frequency ranges, e.g. constructed of different forms of carbon and arranged to act on a common mass of granules 2<a>. The transmitter is mounted in a coneshaped member 7 which is itself mounted by means of a tube 27 and nuts 29, 31 in a bellshaped mouthpiece 1, the member 7 being filled with sound absorbent material, such as cork granules, and formed with reflecting surfaces 5, 6 arranged so that equal portions of oncoming sound waves are caused to impinge on the diaphragms 3, 4 simultaneously. If desired, an additional sound reflector may be provided between the surfaces 5, 6. Fig. 6 shows a modification employing a slightly different form of transmitter 15 and in which the mouthpiece is divided into two separate sound passages 13, 13<a> having flat reflecting surfaces 14, 14<a> at their inner ends and united at their outer ends by a common partition 11. According to a further modification, Fig. 8, three duplex diaphragm transmitters 22 are arranged in a common housing 24 having protective wire gauze covers 23 whilst in a still further modification, Fig. 3, two transmitters 8, 9 are employed electrically connected at 10, bell-shaped mouthpieces 8<c>, 8<d> and sound passages 8<a>, 8<b> leading to opposite sides of the transmitter 8 whilst similar mouthpieces 9<c>, 9<d> and passages 9<a>, 9<b> lead to opposite sides of the transmitter 9.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2746032A GB408221A (en) | 1932-10-03 | 1932-10-03 | Improvements in or relating to telephone transmitters for use in telephoning, public address systems, and sound recording |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2746032A GB408221A (en) | 1932-10-03 | 1932-10-03 | Improvements in or relating to telephone transmitters for use in telephoning, public address systems, and sound recording |
Publications (1)
Publication Number | Publication Date |
---|---|
GB408221A true GB408221A (en) | 1934-04-03 |
Family
ID=10259949
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2746032A Expired GB408221A (en) | 1932-10-03 | 1932-10-03 | Improvements in or relating to telephone transmitters for use in telephoning, public address systems, and sound recording |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB408221A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7889882B2 (en) | 2006-12-20 | 2011-02-15 | Leonard Marshall | Selectable diaphragm condenser microphone |
-
1932
- 1932-10-03 GB GB2746032A patent/GB408221A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7889882B2 (en) | 2006-12-20 | 2011-02-15 | Leonard Marshall | Selectable diaphragm condenser microphone |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB423205A (en) | Improvements in underwater compressional wave senders or receivers | |
US2053982A (en) | Whistle | |
GB433211A (en) | Improvements in or relating to electroacoustic translating devices | |
GB408221A (en) | Improvements in or relating to telephone transmitters for use in telephoning, public address systems, and sound recording | |
CN204836457U (en) | Outdoor portable speaker | |
ES265211U (en) | Improvements in or relating to earphones | |
US1432623A (en) | Telephone | |
US1296683A (en) | Telephone-transmitter. | |
GB732388A (en) | Twin unit stethoscope headphones | |
US1599149A (en) | Sound-box attachment for recording horns | |
GB428144A (en) | Improvements in or relating to microphones or the like | |
GB455208A (en) | Improvements in electro-dynamic loud speakers, microphones and the like sound reproducing and recording apparatus | |
GB371433A (en) | Improvements relating to loud-speakers and like sound reproducing apparatus | |
GB449041A (en) | Improvements in or relating to microphones or transmitters | |
GB304888A (en) | Improvements in diaphragms for use in connection with gramophone sound boxes, loud speaking telephone receivers and for like purposes | |
US1096676A (en) | Telephone-receiver. | |
JPS57150299A (en) | Stereophonic head phone | |
GB222935A (en) | Improvements in and connected with sound reproducers such as are employed in telephone sets, gramophones and the like | |
US1383271A (en) | Sound reproducing and recording apparatus | |
GB328497A (en) | An electrical sound-box for talking machines | |
GB270121A (en) | An electrical loud sounding telephone | |
GB789069A (en) | Electro-acoustic apparatus | |
De Forest | Wireless in the Home... | |
GB274576A (en) | Improvements in and relating to sound amplifying devices for use with telephone receivers | |
GB567955A (en) | Improvements in and relating to moving coil loudspeakers and microphones |