GB1501706A - Multi-frequency signal receivers - Google Patents

Multi-frequency signal receivers

Info

Publication number
GB1501706A
GB1501706A GB1633575A GB1633575A GB1501706A GB 1501706 A GB1501706 A GB 1501706A GB 1633575 A GB1633575 A GB 1633575A GB 1633575 A GB1633575 A GB 1633575A GB 1501706 A GB1501706 A GB 1501706A
Authority
GB
United Kingdom
Prior art keywords
tone
frequencies
output
filters
frequency
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
GB1633575A
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.)
Alcatel CIT SA
Nokia Inc
Original Assignee
Compagnie Industrielle de Telecommunication CIT Alcatel SA
Nokia Inc
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 Compagnie Industrielle de Telecommunication CIT Alcatel SA, Nokia Inc filed Critical Compagnie Industrielle de Telecommunication CIT Alcatel SA
Publication of GB1501706A publication Critical patent/GB1501706A/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
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
GB1633575A 1974-04-24 1975-04-21 Multi-frequency signal receivers Expired GB1501706A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7414300A FR2269261B1 (enExample) 1974-04-24 1974-04-24

Publications (1)

Publication Number Publication Date
GB1501706A true GB1501706A (en) 1978-02-22

Family

ID=9138073

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1633575A Expired GB1501706A (en) 1974-04-24 1975-04-21 Multi-frequency signal receivers

Country Status (9)

Country Link
BE (1) BE827409A (enExample)
CH (1) CH592994A5 (enExample)
DE (1) DE2517807A1 (enExample)
FR (1) FR2269261B1 (enExample)
GB (1) GB1501706A (enExample)
IE (1) IE41016B1 (enExample)
IT (1) IT1037582B (enExample)
NL (1) NL7504828A (enExample)
SE (1) SE7504573L (enExample)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2370386A1 (fr) * 1976-11-05 1978-06-02 Constr Telephoniques Melangeur pour recepteur de signaux multifrequences
FR2485843B1 (fr) * 1980-06-25 1986-11-07 Cit Alcatel Recepteur numerique de frequences

Also Published As

Publication number Publication date
IE41016B1 (en) 1979-09-26
FR2269261A1 (enExample) 1975-11-21
BE827409A (fr) 1975-10-01
IT1037582B (it) 1979-11-20
NL7504828A (nl) 1975-10-28
CH592994A5 (enExample) 1977-11-15
DE2517807A1 (de) 1975-11-06
FR2269261B1 (enExample) 1976-12-17
SE7504573L (sv) 1975-10-27
IE41016L (en) 1975-10-24

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee