GB657554A - Receiver for pulse modulated carrier signals - Google Patents

Receiver for pulse modulated carrier signals

Info

Publication number
GB657554A
GB657554A GB2139/48A GB213948A GB657554A GB 657554 A GB657554 A GB 657554A GB 2139/48 A GB2139/48 A GB 2139/48A GB 213948 A GB213948 A GB 213948A GB 657554 A GB657554 A GB 657554A
Authority
GB
United Kingdom
Prior art keywords
carrier
valve
relay
grid
outputs
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
GB2139/48A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB657554A publication Critical patent/GB657554A/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)
  • Interface Circuits In Exchanges (AREA)

Abstract

657,554. Voice-frequency signalling. STANDARD TELEPHONES & CABLES, Ltd. Jan. 23, 1948, No. 2139. Convention date, Feb. 21, 1947. [Class 40 (iv)] [Also in Group XL (c)] In a receiving circuit for carrier modulated pulses, a valve feeds a relay and a circuit tuned to the carrier frequency, which is coupled to two circuits giving outputs having a phase difference of 90 degrees, these outputs being rectified, combined to remove the second harmonic of the carrier, and fed back to the valve grid to operate the relay. As shown, dialling pulses 1, modulated on an audio-frequency carrier, are applied from terminals 2 to the grid of a valve 4, whose anode circuit includes relay 5 and a tuned circuit 9, 10. The secondary coils 12, 13 coupled thereto are connected through circuits 14, 15 and 16, 17 which respectively advance and retard the carrier phase by 45 degrees to full-wave rectifier circuits 21, 22, the combined outputs of which are smoothed by condenser 30. The resultant positive D.C. pulses 32 are fed over conductor 31 to the grid of valve 4 to operate relay 5.
GB2139/48A 1947-02-21 1948-01-23 Receiver for pulse modulated carrier signals Expired GB657554A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL657554X 1947-02-21

Publications (1)

Publication Number Publication Date
GB657554A true GB657554A (en) 1951-09-19

Family

ID=19795282

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2139/48A Expired GB657554A (en) 1947-02-21 1948-01-23 Receiver for pulse modulated carrier signals

Country Status (1)

Country Link
GB (1) GB657554A (en)

Similar Documents

Publication Publication Date Title
GB536383A (en) Improvements in frequency modulation systems for radio signalling
GB600252A (en) Synchronising arrangements for multiplex electric pulse communication systems
GB454257A (en) Improvements in or relating to modulated carrier wave receivers
GB657554A (en) Receiver for pulse modulated carrier signals
GB632788A (en) Improvements in and relating to multi-channel communication transmission with modulated impulses
GB541731A (en) Improvements in and relating to telephone and like systems
GB499103A (en) Alternating current signalling systems
GB638371A (en) Multi-channel communicating system
GB504711A (en) Improvements in signal-receivers for carrier-telephony systems
GB662956A (en) Improvements in or relating to pulse-modulation signalling systems
GB608117A (en) Voice frequency ringer
GB579677A (en) Electric signal communication system
GB1222666A (en) Circuit for coupling the frequency of a chrominance carrier to the line frequency
GB697280A (en) Method of and device for signalling in pulse communication system
GB632895A (en) Two-way radio communication system
GB494099A (en) Improvements in or relating to telegraph systems
GB370449A (en) Improvements in and relating to high frequency signalling systems
GB604877A (en) Method and means for the transmission of low frequency calls in telecommunication systems
GB554914A (en) Application of frequency dividers to the reception of signal modulated electric carrier waves
GB817713A (en) Improvements relating to radio relays
GB620585A (en) Improvements in and relating to selection arrangements for electrical pulse systems
GB650015A (en) Improvements in or relating to modulators for carrier telegraph systems
GB630200A (en) Improvements in and relating to radio signalling systems
GB621803A (en) Radio receiving system
GB502584A (en) Improvements in or relating to carrier telephony systems