CA974645A - Method and circuit arrangements for the digital decoding of frequency-coded signals - Google Patents

Method and circuit arrangements for the digital decoding of frequency-coded signals

Info

Publication number
CA974645A
CA974645A CA138,503A CA138503A CA974645A CA 974645 A CA974645 A CA 974645A CA 138503 A CA138503 A CA 138503A CA 974645 A CA974645 A CA 974645A
Authority
CA
Canada
Prior art keywords
frequency
coded signals
circuit arrangements
digital decoding
decoding
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
CA138,503A
Other versions
CA138503S (en
Inventor
Volker Diehl
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
Application granted granted Critical
Publication of CA974645A publication Critical patent/CA974645A/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)
CA138,503A 1971-04-05 1972-03-29 Method and circuit arrangements for the digital decoding of frequency-coded signals Expired CA974645A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712116635 DE2116635C3 (en) 1971-04-05 1971-04-05 Method for digital decoding of frequency-coded signals and circuit arrangement for carrying out the method

Publications (1)

Publication Number Publication Date
CA974645A true CA974645A (en) 1975-09-16

Family

ID=5803944

Family Applications (1)

Application Number Title Priority Date Filing Date
CA138,503A Expired CA974645A (en) 1971-04-05 1972-03-29 Method and circuit arrangements for the digital decoding of frequency-coded signals

Country Status (11)

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

Families Citing this family (7)

* 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
DE2712847C3 (en) * 1977-03-23 1979-12-06 Siemens Ag, 1000 Berlin Und 8000 Muenchen Speech-protected, frequency-selective character receiver
CA1137565A (en) * 1979-05-22 1982-12-14 Masaharu Kawaguchi Digital multi-frequency receiver
DE3026016C2 (en) * 1980-07-09 1984-12-13 Siemens AG, 1000 Berlin und 8000 München Circuit arrangement for demodulating mixed frequencies received at a central station
DE3115151A1 (en) * 1981-04-15 1982-11-11 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Circuit arrangement for evaluating AC signals formed from a plurality of simultaneously transmitted alternating currents with different signal frequencies, in telecommunications systems
SE9202065L (en) * 1992-07-03 1994-01-04 Ericsson Telefon Ab L M Ways to improve receiver sensitivity and speech immunity in DTMF reception

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1511133A (en) * 1966-12-16 1968-01-26 Ass Ouvriers Instr Precision Method for identifying each of the frequencies of a group of several determined frequencies and receiving apparatus for implementing this method
NL6712685A (en) * 1967-09-15 1969-03-18

Also Published As

Publication number Publication date
CH540622A (en) 1973-08-15
DE2116635C3 (en) 1978-10-05
GB1364773A (en) 1974-08-29
FR2132303A1 (en) 1972-11-17
SE384619B (en) 1976-05-10
DE2116635B2 (en) 1973-10-04
ES401437A1 (en) 1975-10-01
BR7201977D0 (en) 1974-11-12
FR2132303B1 (en) 1974-08-02
BR7101977D0 (en) 1973-06-14
ES401435A1 (en) 1975-02-16
DE2116635A1 (en) 1972-10-19
JPS5317015B1 (en) 1978-06-05
IT947887B (en) 1973-05-30
NL167827C (en) 1982-01-18
NL7204207A (en) 1972-10-09

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