GB656189A - Improvements in or relating to receiving circuits for telephony - Google Patents

Improvements in or relating to receiving circuits for telephony

Info

Publication number
GB656189A
GB656189A GB4868/48A GB486848A GB656189A GB 656189 A GB656189 A GB 656189A GB 4868/48 A GB4868/48 A GB 4868/48A GB 486848 A GB486848 A GB 486848A GB 656189 A GB656189 A GB 656189A
Authority
GB
United Kingdom
Prior art keywords
circuit
tube
parallel
combination
tuned
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
GB4868/48A
Other languages
English (en)
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB656189A publication Critical patent/GB656189A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephonic Communication Services (AREA)
GB4868/48A 1947-02-21 1948-02-19 Improvements in or relating to receiving circuits for telephony Expired GB656189A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL130519 1947-02-21

Publications (1)

Publication Number Publication Date
GB656189A true GB656189A (en) 1951-08-15

Family

ID=19750410

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4868/48A Expired GB656189A (en) 1947-02-21 1948-02-19 Improvements in or relating to receiving circuits for telephony

Country Status (6)

Country Link
US (1) US2496784A (fr)
CH (1) CH265981A (fr)
DE (1) DE841924C (fr)
FR (2) FR963277A (fr)
GB (1) GB656189A (fr)
NL (1) NL69785C (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL80217C (fr) * 1950-06-15
DE931711C (de) * 1950-08-27 1955-08-16 Lorenz C Ag Empfaenger fuer Wechselstromimpulse
DE973493C (de) * 1950-09-28 1960-03-10 Philips Nv Einseitenbandtraegerfrequenzfernsprechsystem
NL92529C (fr) * 1952-04-09
DE939820C (de) * 1952-05-06 1956-03-01 Siemens Ag Schaltungsanordnung zum Empfang von Spannungen einer oder mehrerer Signalfrequenzen
FI104995B (fi) 1999-01-28 2000-05-15 Halton Oy Kaasumaista väliainetta kuten ilmavirtausta säätävän venttiilin säädinrakenne

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL26143C (fr) * 1927-01-04
US2018464A (en) * 1930-06-07 1935-10-22 Bell Telephone Labor Inc Voice operated transmission circuit
FR812623A (fr) * 1936-01-16 1937-05-13 Applic Telephoniques Soc D Dispositif pour la réception et la retransmission des signaux dans les lignes téléphoniques à longue distance
US2145053A (en) * 1936-11-18 1939-01-24 Bell Telephone Labor Inc Signaling system
US2199179A (en) * 1936-11-27 1940-04-30 Rca Corp Single channel two-way communication system
US2251958A (en) * 1937-01-29 1941-08-12 Hartford Nat Bank & Trust Co Telephony
US2164185A (en) * 1937-05-22 1939-06-27 Great Lakes Pipe Line Company Voice operated repeater
GB495162A (en) * 1938-02-22 1938-11-08 Arthur Reginald Albert Rendall Improvements in and relating to alternating current signalling systems
BE434364A (fr) * 1938-05-16
USRE22897E (en) * 1939-08-14 1947-07-15 Transmission system
US2366011A (en) * 1941-07-23 1944-12-26 Kellogg Switchboard & Supply Two-way amplifier
US2319306A (en) * 1941-10-31 1943-05-18 Bell Telephone Labor Inc Signaling system

Also Published As

Publication number Publication date
CH265981A (de) 1949-12-31
FR961481A (fr) 1950-05-12
FR963277A (fr) 1950-07-05
NL69785C (fr)
US2496784A (en) 1950-02-07
DE841924C (de) 1952-06-19

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