GB1375392A - - Google Patents

Info

Publication number
GB1375392A
GB1375392A GB803571A GB803571A GB1375392A GB 1375392 A GB1375392 A GB 1375392A GB 803571 A GB803571 A GB 803571A GB 803571 A GB803571 A GB 803571A GB 1375392 A GB1375392 A GB 1375392A
Authority
GB
United Kingdom
Prior art keywords
tone
codes
gates
code
store
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
GB803571A
Other languages
English (en)
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 filed Critical
Priority to GB803571A priority Critical patent/GB1375392A/en
Publication of GB1375392A publication Critical patent/GB1375392A/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
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
    • H04Q1/4575—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals which are transmitted in digital form
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/12—Arrangements providing for calling or supervisory signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
GB803571A 1972-02-23 1972-02-23 Expired GB1375392A (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB803571A GB1375392A (fr) 1972-02-23 1972-02-23

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB803571A GB1375392A (fr) 1972-02-23 1972-02-23

Publications (1)

Publication Number Publication Date
GB1375392A true GB1375392A (fr) 1974-11-27

Family

ID=9844536

Family Applications (1)

Application Number Title Priority Date Filing Date
GB803571A Expired GB1375392A (fr) 1972-02-23 1972-02-23

Country Status (1)

Country Link
GB (1) GB1375392A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7600960A (nl) * 1975-01-31 1976-08-03 Telecommunications Sa Werkwijze voor het detecteren van bepaalde frequen- tiecomponenten in signalen, die het gevolg zijn van de multiplexering van numerieke kanalen, alsmede numerieke multifrequentie-ontvanger voor het uit- voeren van deze werkwijze.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7600960A (nl) * 1975-01-31 1976-08-03 Telecommunications Sa Werkwijze voor het detecteren van bepaalde frequen- tiecomponenten in signalen, die het gevolg zijn van de multiplexering van numerieke kanalen, alsmede numerieke multifrequentie-ontvanger voor het uit- voeren van deze werkwijze.

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Legal Events

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