GB1359508A - Apparatus for detecting the presence of a time varying signal - Google Patents

Apparatus for detecting the presence of a time varying signal

Info

Publication number
GB1359508A
GB1359508A GB1998671A GB1998671A GB1359508A GB 1359508 A GB1359508 A GB 1359508A GB 1998671 A GB1998671 A GB 1998671A GB 1998671 A GB1998671 A GB 1998671A GB 1359508 A GB1359508 A GB 1359508A
Authority
GB
United Kingdom
Prior art keywords
tone
counter
exchange line
output
switch
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
GB1998671A
Other languages
English (en)
Inventor
J A Lewis
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.)
AUSTRALIA POSTMASTER GENERALS
Original Assignee
AUSTRALIA POSTMASTER GENERALS
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 AUSTRALIA POSTMASTER GENERALS filed Critical AUSTRALIA POSTMASTER GENERALS
Publication of GB1359508A publication Critical patent/GB1359508A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
    • H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
    • H04Q3/625—Arrangements in the private branch exchange
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
    • H04M15/28—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP with meter at substation or with calculation of charges at terminal

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Manipulation Of Pulses (AREA)
GB1998671A 1970-06-10 1971-06-10 Apparatus for detecting the presence of a time varying signal Expired GB1359508A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU147470 1970-06-10

Publications (1)

Publication Number Publication Date
GB1359508A true GB1359508A (en) 1974-07-10

Family

ID=3691994

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1998671A Expired GB1359508A (en) 1970-06-10 1971-06-10 Apparatus for detecting the presence of a time varying signal

Country Status (2)

Country Link
GB (1) GB1359508A (enrdf_load_stackoverflow)
SE (1) SE377022B (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2334249A1 (fr) * 1975-12-03 1977-07-01 Constr Telephoniques Systeme d'identification pour central telephonique prive
FR2339302A1 (fr) * 1976-01-26 1977-08-19 Sodeco Compteurs De Geneve Procede pour detecter l'utilisation des postes dans les centraux telephoniques prives automatiques et montage pour la mise en oeuvre du procede
FR2341990A1 (fr) * 1976-02-23 1977-09-16 Automatisme Tech Electro Contr Systeme pour identifier les postes en conversation dans une installation telephonique privee
FR2403698A2 (fr) * 1977-09-14 1979-04-13 Sodeco Compteurs De Geneve Procede de detection de l'utilisation de postes dans les centraux telephoniques prives automatiques et montage pour la mise en oeuvre du procede
FR2423099A1 (fr) * 1978-04-13 1979-11-09 Siemens Ag Montage pour la determination, realisee independamment du systeme, de donnees de conversation et de taxes
GB2138250A (en) * 1983-04-14 1984-10-17 Control Data Corp Method and apparatus for detecting the channel to which an electronic receiver system is tuned

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2334249A1 (fr) * 1975-12-03 1977-07-01 Constr Telephoniques Systeme d'identification pour central telephonique prive
FR2339302A1 (fr) * 1976-01-26 1977-08-19 Sodeco Compteurs De Geneve Procede pour detecter l'utilisation des postes dans les centraux telephoniques prives automatiques et montage pour la mise en oeuvre du procede
FR2341990A1 (fr) * 1976-02-23 1977-09-16 Automatisme Tech Electro Contr Systeme pour identifier les postes en conversation dans une installation telephonique privee
FR2403698A2 (fr) * 1977-09-14 1979-04-13 Sodeco Compteurs De Geneve Procede de detection de l'utilisation de postes dans les centraux telephoniques prives automatiques et montage pour la mise en oeuvre du procede
FR2423099A1 (fr) * 1978-04-13 1979-11-09 Siemens Ag Montage pour la determination, realisee independamment du systeme, de donnees de conversation et de taxes
GB2138250A (en) * 1983-04-14 1984-10-17 Control Data Corp Method and apparatus for detecting the channel to which an electronic receiver system is tuned

Also Published As

Publication number Publication date
SE377022B (enrdf_load_stackoverflow) 1975-06-16

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Legal Events

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