GB495162A - Improvements in and relating to alternating current signalling systems - Google Patents
Improvements in and relating to alternating current signalling systemsInfo
- Publication number
- GB495162A GB495162A GB563238A GB563238A GB495162A GB 495162 A GB495162 A GB 495162A GB 563238 A GB563238 A GB 563238A GB 563238 A GB563238 A GB 563238A GB 495162 A GB495162 A GB 495162A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal frequency
- valve
- output
- circuit
- 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
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
- H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
495,162. Exchange systems; valve relays. RENDALL, A. R. A. Feb. 22, 1938, No. 5632. [Class 40 (iv)] [Also in Group XL] An alternating-current signal receiver which discriminates against speech or the like containing the signal frequency comprises a valve the bias of which is controlled in opposite senses by potentials derived by rectification from circuits effectively in series in the output and having maximum and minimum impedance respectively at the signal frequency. The valve is normally biassed to its lower bend by a potential divider 6, 7 across the heater 2 and output signal frequency is applied over tuned transformer 14 to rectifier 21 which sets up a positive biassing charge across condenser 9 in the grid circuit. Frequencies other than the signal frequency are applied over transformer 17, having a primary circuit with a minimum impedance to signal frequency, to rectifier 25 which sets up a negative biassing charge across condenser 8. Relay 18 in the anode circuit pulls up on increase of anode current and operates 29 which completes the signal circuit. Operation of the receiver by transient currents of signal frequency is prevented by resistance 22 in the charging circuit of condenser 9, and by a condenserresistance shunt on relay 29 to make it sluggish. The output of the valve may be amplified before application to the rectifiers and the output of the rectifiers may be amplified.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB563238A GB495162A (en) | 1938-02-22 | 1938-02-22 | Improvements in and relating to alternating current signalling systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB563238A GB495162A (en) | 1938-02-22 | 1938-02-22 | Improvements in and relating to alternating current signalling systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB495162A true GB495162A (en) | 1938-11-08 |
Family
ID=9799726
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB563238A Expired GB495162A (en) | 1938-02-22 | 1938-02-22 | Improvements in and relating to alternating current signalling systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB495162A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE841924C (en) * | 1947-02-21 | 1952-06-19 | Philips Nv | Receiving circuit for low frequency or carrier current telephony systems |
DE903824C (en) * | 1950-06-15 | 1954-02-11 | Mix & Genest Ag | Electrical signal receivers, in particular audio frequency signal receivers |
DE973493C (en) * | 1950-09-28 | 1960-03-10 | Philips Nv | Single sideband carrier frequency telephone system |
-
1938
- 1938-02-22 GB GB563238A patent/GB495162A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE841924C (en) * | 1947-02-21 | 1952-06-19 | Philips Nv | Receiving circuit for low frequency or carrier current telephony systems |
DE903824C (en) * | 1950-06-15 | 1954-02-11 | Mix & Genest Ag | Electrical signal receivers, in particular audio frequency signal receivers |
DE973493C (en) * | 1950-09-28 | 1960-03-10 | Philips Nv | Single sideband carrier frequency telephone system |
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