IT947887B - METHOD AND CIRCUITAL STRUCTURE FOR THE NUMERICAL DECODING OF SE GNALS FREQUENCY CODED - Google Patents

METHOD AND CIRCUITAL STRUCTURE FOR THE NUMERICAL DECODING OF SE GNALS FREQUENCY CODED

Info

Publication number
IT947887B
IT947887B IT2101672A IT2101672A IT947887B IT 947887 B IT947887 B IT 947887B IT 2101672 A IT2101672 A IT 2101672A IT 2101672 A IT2101672 A IT 2101672A IT 947887 B IT947887 B IT 947887B
Authority
IT
Italy
Prior art keywords
gnals
frequency coded
circuital structure
numerical decoding
decoding
Prior art date
Application number
IT2101672A
Other languages
Italian (it)
Original Assignee
Ibm
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 Ibm filed Critical Ibm
Application granted granted Critical
Publication of IT947887B publication Critical patent/IT947887B/en

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)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Noise Elimination (AREA)
  • Analogue/Digital Conversion (AREA)
IT2101672A 1971-04-05 1972-02-25 METHOD AND CIRCUITAL STRUCTURE FOR THE NUMERICAL DECODING OF SE GNALS FREQUENCY CODED IT947887B (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
IT947887B true IT947887B (en) 1973-05-30

Family

ID=5803944

Family Applications (1)

Application Number Title Priority Date Filing Date
IT2101672A IT947887B (en) 1971-04-05 1972-02-25 METHOD AND CIRCUITAL STRUCTURE FOR THE NUMERICAL DECODING OF SE GNALS FREQUENCY CODED

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) ES401435A1 (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
ES401437A1 (en) 1975-10-01
ES401435A1 (en) 1975-02-16
JPS5317015B1 (en) 1978-06-05
BR7101977D0 (en) 1973-06-14
GB1364773A (en) 1974-08-29
DE2116635A1 (en) 1972-10-19
DE2116635C3 (en) 1978-10-05
DE2116635B2 (en) 1973-10-04
NL7204207A (en) 1972-10-09
SE384619B (en) 1976-05-10
FR2132303B1 (en) 1974-08-02
BR7201977D0 (en) 1974-11-12
CA974645A (en) 1975-09-16
NL167827C (en) 1982-01-18
CH540622A (en) 1973-08-15
FR2132303A1 (en) 1972-11-17

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