ES401437A1 - Perfeccionamientos introducidos en circuitos para la deco- dificacion digital de senales codificadas en frecuencia. - Google Patents

Perfeccionamientos introducidos en circuitos para la deco- dificacion digital de senales codificadas en frecuencia.

Info

Publication number
ES401437A1
ES401437A1 ES401437A ES401437A ES401437A1 ES 401437 A1 ES401437 A1 ES 401437A1 ES 401437 A ES401437 A ES 401437A ES 401437 A ES401437 A ES 401437A ES 401437 A1 ES401437 A1 ES 401437A1
Authority
ES
Spain
Prior art keywords
frequency
computation
input
circuit
circuits
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
ES401437A
Other languages
English (en)
Spanish (es)
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 ES401437A1 publication Critical patent/ES401437A1/es
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)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Analogue/Digital Conversion (AREA)
  • Noise Elimination (AREA)
  • Mobile Radio Communication Systems (AREA)
ES401437A 1971-04-05 1972-04-04 Perfeccionamientos introducidos en circuitos para la deco- dificacion digital de senales codificadas en frecuencia. Expired ES401437A1 (es)

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
ES401437A1 true ES401437A1 (es) 1975-10-01

Family

ID=5803944

Family Applications (2)

Application Number Title Priority Date Filing Date
ES401437A Expired ES401437A1 (es) 1971-04-05 1972-04-04 Perfeccionamientos introducidos en circuitos para la deco- dificacion digital de senales codificadas en frecuencia.
ES401435A Expired ES401435A1 (es) 1971-04-05 1972-04-04 Un metodo para la decodificacion digital de senales codifi-cadas en frecuencia.

Family Applications After (1)

Application Number Title Priority Date Filing Date
ES401435A Expired ES401435A1 (es) 1971-04-05 1972-04-04 Un metodo para la decodificacion digital de senales codifi-cadas en frecuencia.

Country Status (11)

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

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 (de) * 1977-03-23 1979-12-06 Siemens Ag, 1000 Berlin Und 8000 Muenchen Sprachgeschützter frequenzselektiver Zeichenempfänger
US4328398A (en) * 1979-05-22 1982-05-04 Oki Electric Industry Co., Ltd. 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
SE9202065L (sv) * 1992-07-03 1994-01-04 Ericsson Telefon Ab L M Sätt att förbättra mottagarens känslighet och talimmuniteten vid DTMF-mottagning

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 (enExample) * 1967-09-15 1969-03-18

Also Published As

Publication number Publication date
GB1364773A (en) 1974-08-29
FR2132303A1 (enExample) 1972-11-17
DE2116635A1 (de) 1972-10-19
NL167827C (nl) 1982-01-18
DE2116635C3 (de) 1978-10-05
IT947887B (it) 1973-05-30
CA974645A (en) 1975-09-16
CH540622A (de) 1973-08-15
ES401435A1 (es) 1975-02-16
NL7204207A (enExample) 1972-10-09
BR7201977D0 (pt) 1974-11-12
JPS5317015B1 (enExample) 1978-06-05
BR7101977D0 (pt) 1973-06-14
SE384619B (sv) 1976-05-10
DE2116635B2 (de) 1973-10-04
FR2132303B1 (enExample) 1974-08-02

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