GB437028A - An improved method and means for the transmission of electric signals - Google Patents
An improved method and means for the transmission of electric signalsInfo
- Publication number
- GB437028A GB437028A GB1216434A GB1216434A GB437028A GB 437028 A GB437028 A GB 437028A GB 1216434 A GB1216434 A GB 1216434A GB 1216434 A GB1216434 A GB 1216434A GB 437028 A GB437028 A GB 437028A
- Authority
- GB
- United Kingdom
- Prior art keywords
- operator
- secondary winding
- head
- windings
- line
- 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
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Selective Calling Equipment (AREA)
Abstract
437,028. Substation circuits. RIMMINGTON, F., 14, Norbury Avenue, Thornton Heath, and GRANTHAM, A. W., 39, Ruskin Road, Carshalton, both in Surrey. April 23, 1934, No. 12164. [Class 40 (iv)] Signal currents from a speaker's microphone 1 or gramophone pick-up at an office or institution are fed through separate secondary windings 7<1> ... 7<3> of the output transformer of an amplifier 4 to a number of listeners over a corresponding number of exchange lines 15. Each line 15 is provided with a local-operator's three-position key 10 by which the line may be connected to a calling relay 12, the operator's head-set 16 ... 18, and the appropriate secondary winding 7<1>, respectively. A further key 19 connects the operator's head-set alternatively to the keys 10 and to an additional (monitoring) secondary winding 7. Relays 13 connected in series with windings 7<1> control clearing signals 13<1>. For use with a large number of lines, a cascade arrangement of transformers may be used, each secondary winding of the output transformer 6 being connected to the primary of a further transformer which itself has a plurality of separate secondaries.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1216434A GB437028A (en) | 1934-04-23 | 1934-04-23 | An improved method and means for the transmission of electric signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1216434A GB437028A (en) | 1934-04-23 | 1934-04-23 | An improved method and means for the transmission of electric signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB437028A true GB437028A (en) | 1935-10-23 |
Family
ID=9999520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1216434A Expired GB437028A (en) | 1934-04-23 | 1934-04-23 | An improved method and means for the transmission of electric signals |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB437028A (en) |
-
1934
- 1934-04-23 GB GB1216434A patent/GB437028A/en not_active Expired
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