GB144293A - Improvements in electric signalling systems - Google Patents
Improvements in electric signalling systemsInfo
- Publication number
- GB144293A GB144293A GB14995/20A GB1499520A GB144293A GB 144293 A GB144293 A GB 144293A GB 14995/20 A GB14995/20 A GB 14995/20A GB 1499520 A GB1499520 A GB 1499520A GB 144293 A GB144293 A GB 144293A
- Authority
- GB
- United Kingdom
- Prior art keywords
- currents
- frequency
- relay
- ringing
- condenser
- 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
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
- H04Q1/4423—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using one signalling frequency
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Devices For Supply Of Signal Current (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Interface Circuits In Exchanges (AREA)
- Amplifiers (AREA)
Abstract
144,293. Western Electric Co., (Assignees of Clark, A. B.). Sept. 20, 1918, [Convention date]. Amplifying and repeating systems.-In signalling systems in which currents of different frequencies are used at different times (for example, in a telephone repeater system which amplifies voice-currents and must also be able to deal with ringing-current of lower frequency, such as 133 cycles per second) means are provided which respond to currents of a particular frequency (such as the ringing frequency) to improve the transmission of that frequency. In the repeating system shown in Fig. 1, ringing-current energizes a relay 11 in a tuned circuit bridged across a, condenser 12 on the out-put side of the amplifier 1, and the relay 11 de-energizes a relay 10 to bridge a condenser 7 across the input transformer 2, forming a circuit resonant to currents of the ringing-frequency, whereby the amplification of such currents is greatly increased. The relay 10 also open-circuits a potentiometer 6, which is normally bridged across the input circuit and which serves to adjust the degree of amplification of voice-currents.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US246910A US1353031A (en) | 1918-07-26 | 1918-07-26 | Vacuum-bulb for signaling apparatus |
| US254974A US1371298A (en) | 1918-07-26 | 1918-09-20 | Telephone and call signal system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB144293A true GB144293A (en) | 1920-10-28 |
Family
ID=26938320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB14995/20A Expired GB144293A (en) | 1918-07-26 | 1920-06-02 | Improvements in electric signalling systems |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US1371298A (en) |
| FR (3) | FR519492A (en) |
| GB (1) | GB144293A (en) |
| NL (1) | NL8176C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2966556A (en) * | 1959-05-18 | 1960-12-27 | Bell Telephone Labor Inc | Dial tone gating circuit |
-
1918
- 1918-09-20 US US254974A patent/US1371298A/en not_active Expired - Lifetime
- 1918-12-31 FR FR519492A patent/FR519492A/en not_active Expired
-
1919
- 1919-08-09 NL NL12686A patent/NL8176C/xx active
- 1919-10-14 FR FR22613A patent/FR22613E/en not_active Expired
-
1920
- 1920-01-08 FR FR22688A patent/FR22688E/en not_active Expired
- 1920-06-02 GB GB14995/20A patent/GB144293A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US1371298A (en) | 1921-03-15 |
| FR22688E (en) | 1921-08-04 |
| FR22613E (en) | 1921-08-04 |
| NL8176C (en) | 1923-01-15 |
| FR519492A (en) | 1921-06-10 |
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