GB1364773A - Decoding of frequency coded signals - Google Patents

Decoding of frequency coded signals

Info

Publication number
GB1364773A
GB1364773A GB1222972A GB1222972A GB1364773A GB 1364773 A GB1364773 A GB 1364773A GB 1222972 A GB1222972 A GB 1222972A GB 1222972 A GB1222972 A GB 1222972A GB 1364773 A GB1364773 A GB 1364773A
Authority
GB
United Kingdom
Prior art keywords
gates
counts
counter
frequencies
channel
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
GB1222972A
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB1364773A publication Critical patent/GB1364773A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Noise Elimination (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Analogue/Digital Conversion (AREA)
GB1222972A 1971-04-05 1972-03-16 Decoding of frequency coded signals Expired GB1364773A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712116635 DE2116635C3 (de) 1971-04-05 1971-04-05 Verfahren zur digitalen Decodierung frequenzcodierter Signale und Schaltungsanordnung zur Durchführung des Verfahrens

Publications (1)

Publication Number Publication Date
GB1364773A true GB1364773A (en) 1974-08-29

Family

ID=5803944

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1222972A Expired GB1364773A (en) 1971-04-05 1972-03-16 Decoding of frequency coded signals

Country Status (11)

Country Link
JP (1) JPS5317015B1 (sv)
BR (2) BR7101977D0 (sv)
CA (1) CA974645A (sv)
CH (1) CH540622A (sv)
DE (1) DE2116635C3 (sv)
ES (2) ES401437A1 (sv)
FR (1) FR2132303B1 (sv)
GB (1) GB1364773A (sv)
IT (1) IT947887B (sv)
NL (1) NL167827C (sv)
SE (1) SE384619B (sv)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4187403A (en) * 1977-03-23 1980-02-05 Siemens Aktiengesellschaft Voice-protected, frequency-selective signal receiver
EP0576980A2 (en) * 1992-07-03 1994-01-05 Telefonaktiebolaget Lm Ericsson A method of improving sensitivity and speech immunity of a multifrequency receiver

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936801A (en) * 1974-09-12 1976-02-03 Bell Telephone Laboratories, Incorporated Multifrequency signal receiver timing circuit
CA1031086A (en) * 1976-03-03 1978-05-09 Northern Electric Company Method and apparatus for translating multiple frequency signalling
CA1137565A (en) * 1979-05-22 1982-12-14 Masaharu Kawaguchi Digital multi-frequency receiver
DE3026016C2 (de) * 1980-07-09 1984-12-13 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung zur Demodulation von Frequenzgemischen, die an einer Zentralstation empfangen werden
DE3115151A1 (de) * 1981-04-15 1982-11-11 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schaltungsanordnung zur auswertung von aus mehreren gleichzeitig uebertragenen wechselstroemen unterschiedlicher signalfrequenzen gebildeten wechselstromsignalen, in fernmeldeanlagen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1511133A (fr) * 1966-12-16 1968-01-26 Ass Ouvriers Instr Precision Procédé d'identification de chacune des fréquences d'un groupe de plusieurs fréquences déterminées et appareil récepteur pour la mise en oeuvre de ce procédé
NL6712685A (sv) * 1967-09-15 1969-03-18

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4187403A (en) * 1977-03-23 1980-02-05 Siemens Aktiengesellschaft Voice-protected, frequency-selective signal receiver
EP0576980A2 (en) * 1992-07-03 1994-01-05 Telefonaktiebolaget Lm Ericsson A method of improving sensitivity and speech immunity of a multifrequency receiver
EP0576980A3 (sv) * 1992-07-03 1994-03-02 Ericsson Telefon Ab L M
US5426696A (en) * 1992-07-03 1995-06-20 Telefonaktiebolaget Lm Ericsson Method of improving receiver sensitivity and speech immunity with DTMF-reception

Also Published As

Publication number Publication date
CH540622A (de) 1973-08-15
DE2116635C3 (de) 1978-10-05
FR2132303A1 (sv) 1972-11-17
SE384619B (sv) 1976-05-10
DE2116635B2 (de) 1973-10-04
ES401437A1 (es) 1975-10-01
BR7201977D0 (pt) 1974-11-12
FR2132303B1 (sv) 1974-08-02
BR7101977D0 (pt) 1973-06-14
CA974645A (en) 1975-09-16
ES401435A1 (es) 1975-02-16
DE2116635A1 (de) 1972-10-19
JPS5317015B1 (sv) 1978-06-05
IT947887B (it) 1973-05-30
NL167827C (nl) 1982-01-18
NL7204207A (sv) 1972-10-09

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Legal Events

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