GB495162A - Improvements in and relating to alternating current signalling systems - Google Patents

Improvements in and relating to alternating current signalling systems

Info

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
Application number
GB563238A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ARTHUR REGINALD ALBERT RENDALL
Original Assignee
ARTHUR REGINALD ALBERT RENDALL
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ARTHUR REGINALD ALBERT RENDALL filed Critical ARTHUR REGINALD ALBERT RENDALL
Priority to GB563238A priority Critical patent/GB495162A/en
Publication of GB495162A publication Critical patent/GB495162A/en
Expired legal-status Critical Current

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.
GB563238A 1938-02-22 1938-02-22 Improvements in and relating to alternating current signalling systems Expired GB495162A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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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