GB663859A - Improvements in or relating to selective calling systems - Google Patents

Improvements in or relating to selective calling systems

Info

Publication number
GB663859A
GB663859A GB8227/48A GB822748A GB663859A GB 663859 A GB663859 A GB 663859A GB 8227/48 A GB8227/48 A GB 8227/48A GB 822748 A GB822748 A GB 822748A GB 663859 A GB663859 A GB 663859A
Authority
GB
United Kingdom
Prior art keywords
switches
contacts
reeds
relay
banks
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
GB8227/48A
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 GB663859A publication Critical patent/GB663859A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18—Service support devices; Network management devices
    • H04W88/185—Selective call encoders for paging networks, e.g. paging centre devices
    • H04W88/188—Selective call encoders for paging networks, e.g. paging centre devices using frequency address codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

663,859. Electric selective signalling. STANDARD TELEPHONES & CABLES, Ltd. March 19, 1948. [March 20, 1947] No. 8227/48. Addition to 657,894. Class 40 (i). [Also in Group XXXIX] The system described in Specification 657,894 for the transmission of numbers by means of a carrier modulated with voice-frequency pulses characteristic of the digits is modified so that an eleventh frequency x is transmitted to mark the first repetition of a digit. The numbers 2234, 2224 and 2222 are then transmitted as 2x34, 2x24 and 2x2x. The modifications are confined to the register switches, Fig. 2. Transmitter : corresponding contacts of the first banks of switches Hand T are strapped together and relay 131 operates if the second and third digits are the same providing that relay 130 is not operated. Similarly, in the second banks, contacts of switches TH and T are strapped to the contacts of switches H and U and repetition is indicated by relays 130, 132. Operation of any one of the relays marks the eleventh frequency for transmission. The switches are driven by stepping magnets 17-20. Receiver: a receiver for a number 2234 comprises four reeds f2, fx, f3, f4 tuned to the frequencies indicated by the suffixes. The reeds are vibrated by a magnet 110 and if the four frequencies arrive in the correct order, the reeds close contacts 106-109 in turn and a charge acquired by condenser 113 from battery 111 is passed on from one condenser to another to operate relay 118 which gives the calling signal. Specifications 630,815, [Group XL (c)], and 630,819 are referred to.
GB8227/48A 1947-03-20 1948-03-19 Improvements in or relating to selective calling systems Expired GB663859A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US735939A US2457149A (en) 1947-03-20 1947-03-20 Selective signaling circuit

Publications (1)

Publication Number Publication Date
GB663859A true GB663859A (en) 1951-12-27

Family

ID=63556069

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8227/48A Expired GB663859A (en) 1947-03-20 1948-03-19 Improvements in or relating to selective calling systems

Country Status (4)

Country Link
US (1) US2457149A (en)
BE (1) BE482052A (en)
FR (1) FR963490A (en)
GB (1) GB663859A (en)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2591937A (en) * 1947-05-01 1952-04-08 Automatic Elect Lab Selective calling system
US2547025A (en) * 1947-05-23 1951-04-03 Motorola Inc Frequency selective calling system
US2547024A (en) * 1947-05-23 1951-04-03 Motorola Inc Selective calling system
US2547023A (en) * 1947-05-23 1951-04-03 Motorola Inc Selective calling system
US2602853A (en) * 1947-08-07 1952-07-08 Bell Telephone Labor Inc Selective signaling system
US2658188A (en) * 1948-06-29 1953-11-03 Bell Telephone Labor Inc Pulse position dialing system with direct time measuring apparatus
US2630482A (en) * 1948-07-10 1953-03-03 Bell Telephone Labor Inc Tuned vibrating reed selective circuit
GB673173A (en) * 1949-04-02
US2666196A (en) * 1949-06-07 1954-01-12 Bell Telephone Labor Inc Frequency station calling system using bifurcated piezoelectric elements
US2693526A (en) * 1949-06-15 1954-11-02 Automatic Elect Lab Single channel single frequency mobile radio telephone system
US2732433A (en) * 1950-09-22 1956-01-24 Automatic telephone exchanges
US2991562A (en) * 1953-04-10 1961-07-11 Donald G C Hare Training aid system for wave detection equipment
NL96282C (en) * 1954-12-30
DE1025023B (en) * 1955-01-15 1958-02-27 Deutsche Bundespost Selective call system for dialing telephone subscribers in voice radio networks
US2975410A (en) * 1955-06-06 1961-03-14 Itt Data translating system
US2961649A (en) * 1956-03-09 1960-11-22 Kenneth R Eldredge Automatic reading system
US2934745A (en) * 1956-08-06 1960-04-26 Karl L Kocmanek Remote frequency selection system
US2980794A (en) * 1957-06-13 1961-04-18 Fairchild Camera Instr Co Automatic tone decoder
US3023373A (en) * 1958-05-15 1962-02-27 Thompson Ramo Wooldridge Inc Precision variable frequency generator
US3729581A (en) * 1970-09-03 1973-04-24 Display Sys Corp Computer assisted dial access video retrieval for an instructional television system

Also Published As

Publication number Publication date
BE482052A (en) 1948-10-23
FR963490A (en) 1950-07-11
US2457149A (en) 1948-12-28

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