GB504711A - Improvements in signal-receivers for carrier-telephony systems - Google Patents
Improvements in signal-receivers for carrier-telephony systemsInfo
- Publication number
- GB504711A GB504711A GB37464/38A GB3746438A GB504711A GB 504711 A GB504711 A GB 504711A GB 37464/38 A GB37464/38 A GB 37464/38A GB 3746438 A GB3746438 A GB 3746438A GB 504711 A GB504711 A GB 504711A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signals
- relay
- carrier
- current
- circuit
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/14—Arrangements providing for calling or supervisory signals
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
- Noise Elimination (AREA)
- Devices For Supply Of Signal Current (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
504,711. Carrier telephone systems. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. Dec. 23, 1938, No. 37464. Convention date, Dec. 27, 1937. [Class 40 (iv)] In a multiplex carrier telephone system in which signals, e.g. dialled impulses or calling signals, are transmitted by means of the carrier wave, which is suppressed during speech, these signals are combined in the receiver with a locally generated current of different frequency and the resulting beatfrequency current is rectified and controls a relay. The locally generated current may be derived from the carrier wave generator of another channel and may differ in frequency from the signal by 8 Kc. As shown, the signals pass via a valve V2 with a grid condenser and leak designed to keep the output constant for varying inputs, to a circuit which includes a rectifier F1 and in which they are combined with oscillations from a source H. The resulting beat-frequency oscillations are rectified at F2 and produce a biassing voltage across a resistance W in the grid circuit of a speech amplifier V1 so as to release a relay R2 in its anode circuit. In a modification, not described in detail, the relay is controlled by a separate valve the anode current of which is increased by the signals. Signals are transmitted by a relay R1 which connects the carrier source G1 to the line.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP2125D DE1080615B (en) | 1937-12-27 | 1937-12-27 | Signal receiver for carrier wave telephony systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB504711A true GB504711A (en) | 1939-04-28 |
Family
ID=7357758
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB37462/38A Expired GB523067A (en) | 1937-12-27 | 1938-12-23 | Improvements in signal receivers for carrier telephony systems |
| GB37463/38A Expired GB523068A (en) | 1937-12-27 | 1938-12-23 | Improvements in or relating to signal receivers for carrier-telephony systems |
| GB37464/38A Expired GB504711A (en) | 1937-12-27 | 1938-12-23 | Improvements in signal-receivers for carrier-telephony systems |
Family Applications Before (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB37462/38A Expired GB523067A (en) | 1937-12-27 | 1938-12-23 | Improvements in signal receivers for carrier telephony systems |
| GB37463/38A Expired GB523068A (en) | 1937-12-27 | 1938-12-23 | Improvements in or relating to signal receivers for carrier-telephony systems |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US2210957A (en) |
| BE (3) | BE431842A (en) |
| CH (1) | CH206315A (en) |
| DE (2) | DE1080615B (en) |
| FR (2) | FR848015A (en) |
| GB (3) | GB523067A (en) |
| NL (1) | NL52757C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2564378A (en) * | 1946-05-06 | 1951-08-14 | Punch Engineering Pty Ltd | Carrier system signaling circuits |
| BE482215A (en) * | 1947-04-29 | |||
| NL72570C (en) * | 1949-09-02 | |||
| US2721979A (en) * | 1950-07-07 | 1955-10-25 | Westinghouse Air Brake Co | Switching and control means for carrier signaling and communication equipments |
| NL102595C (en) * | 1956-04-26 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT91298B (en) * | 1915-12-01 | 1923-02-10 | Western Electric Co Ltd | Device for simultaneous telegraphing and telephoning with or without wire. |
| US1484405A (en) * | 1920-01-12 | 1924-02-19 | Western Electric Co | Signaling system |
| DE497115C (en) * | 1928-12-29 | 1930-05-02 | Lorenz Akt Ges C | Arrangement for achieving high selectivity of electrical receiving devices |
| AT140823B (en) * | 1932-12-22 | 1935-02-25 | Siemens Ag | Multiple transmission system with carrier currents, especially for cable lines. |
| GB460428A (en) * | 1935-08-24 | 1937-01-27 | Philips Nv | Improvements in or relating to the transmission of ringing signals in carrier frequency telephony systems |
-
0
- BE BE431843D patent/BE431843A/xx unknown
- BE BE431870D patent/BE431870A/xx unknown
- NL NL52757D patent/NL52757C/xx active
- BE BE431842D patent/BE431842A/xx unknown
-
1937
- 1937-12-27 DE DEP2125D patent/DE1080615B/en active Pending
- 1937-12-28 DE DEN41472D patent/DE753441C/en not_active Expired
-
1938
- 1938-12-17 US US246457A patent/US2210957A/en not_active Expired - Lifetime
- 1938-12-23 GB GB37462/38A patent/GB523067A/en not_active Expired
- 1938-12-23 GB GB37463/38A patent/GB523068A/en not_active Expired
- 1938-12-23 GB GB37464/38A patent/GB504711A/en not_active Expired
- 1938-12-24 CH CH206315D patent/CH206315A/en unknown
- 1938-12-26 FR FR848015D patent/FR848015A/en not_active Expired
- 1938-12-26 FR FR848016D patent/FR848016A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB523068A (en) | 1940-07-04 |
| FR848016A (en) | 1939-10-20 |
| DE753441C (en) | 1944-08-03 |
| NL52757C (en) | |
| BE431842A (en) | |
| BE431843A (en) | |
| CH206315A (en) | 1939-07-31 |
| DE1080615B (en) | 1960-04-28 |
| GB523067A (en) | 1940-07-04 |
| FR848015A (en) | 1939-10-20 |
| US2210957A (en) | 1940-08-13 |
| BE431870A (en) |
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