AU507727B2 - Recognizing Multifrequency Coded Telephone Signals Converted into Digital Foam - Google Patents

Recognizing Multifrequency Coded Telephone Signals Converted into Digital Foam

Info

Publication number
AU507727B2
AU507727B2 AU31320/77A AU3132077A AU507727B2 AU 507727 B2 AU507727 B2 AU 507727B2 AU 31320/77 A AU31320/77 A AU 31320/77A AU 3132077 A AU3132077 A AU 3132077A AU 507727 B2 AU507727 B2 AU 507727B2
Authority
AU
Australia
Prior art keywords
recognizing
signals converted
telephone signals
coded telephone
digital foam
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
AU31320/77A
Other languages
English (en)
Other versions
AU3132077A (en
Inventor
R Me Lindo F. and Rucci
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.)
Telecom Italia SpA
Original Assignee
CSELT Centro Studi e Laboratori Telecomunicazioni SpA
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 CSELT Centro Studi e Laboratori Telecomunicazioni SpA filed Critical CSELT Centro Studi e Laboratori Telecomunicazioni SpA
Publication of AU3132077A publication Critical patent/AU3132077A/en
Application granted granted Critical
Publication of AU507727B2 publication Critical patent/AU507727B2/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
    • H04Q1/4575—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 which are transmitted in digital form
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
AU31320/77A 1976-12-17 1977-12-07 Recognizing Multifrequency Coded Telephone Signals Converted into Digital Foam Expired AU507727B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITIT70007/76 1976-12-17
IT7000776A IT1072242B (it) 1976-12-17 1976-12-17 Procedimento e dispositivo per il riconoscimento di segnali telefonici in codice multifrequenza convertiti in forma numerica

Publications (2)

Publication Number Publication Date
AU3132077A AU3132077A (en) 1979-06-14
AU507727B2 true AU507727B2 (en) 1980-02-28

Family

ID=11313285

Family Applications (1)

Application Number Title Priority Date Filing Date
AU31320/77A Expired AU507727B2 (en) 1976-12-17 1977-12-07 Recognizing Multifrequency Coded Telephone Signals Converted into Digital Foam

Country Status (11)

Country Link
JP (1) JPS53121408A (fr)
AR (1) AR216659A1 (fr)
AU (1) AU507727B2 (fr)
BR (1) BR7707827A (fr)
DE (1) DE2756251C3 (fr)
FR (1) FR2374808A1 (fr)
GB (1) GB1566164A (fr)
IT (1) IT1072242B (fr)
MX (1) MX144395A (fr)
SE (1) SE437102B (fr)
TR (1) TR19857A (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2440126A1 (fr) * 1978-10-27 1980-05-23 Materiel Telephonique Dispositif et procede de reconnaissance pour recepteur numerique de signaux multifrequences
US4227055A (en) * 1978-12-07 1980-10-07 Bell Telephone Laboratories, Incorporated Multifrequency receiver
CA1111531A (fr) * 1979-02-22 1981-10-27 Jackylene K. Hood Recepteur de tonalites mic
NL7903346A (nl) * 1979-04-27 1980-10-29 Bell Telephone Mfg Digitaal signaleringsstelsel.
FR2479631B1 (fr) * 1980-03-28 1986-07-25 Cit Alcatel Dispositif de confirmation de signaux
FR2485843B1 (fr) * 1980-06-25 1986-11-07 Cit Alcatel Recepteur numerique de frequences
IT1148885B (it) * 1980-07-09 1986-12-03 Sits Soc It Telecom Siemens Unita' di controllo della segnalazione di tipo multifrequenza,di particolare applicazione nelle centrali telefonichedi transito di tipo numerico
US4385208A (en) * 1981-04-15 1983-05-24 Bell Telephone Laboratories, Incorporated Multifrequency receiver
DE3424327A1 (de) * 1984-07-02 1986-01-09 Philips Patentverwaltung Gmbh, 2000 Hamburg Verfahren und schaltungsanordnung zur bestimmung der einhuellenden von signalkomponenten eines mehrfrequenzcodierten wahlzeichens
CH672968A5 (fr) * 1984-11-30 1990-01-15 Autophon Ascom Ag
JPS61225929A (ja) * 1985-03-30 1986-10-07 Fujitsu Ltd デイジタルト−ンの生成方法
US4783845A (en) * 1985-12-20 1988-11-08 Itt Aerospace Optical Digital tone squelch detector
JPS62204652A (ja) * 1986-03-04 1987-09-09 Nec Corp 可聴周波信号識別方式
CA2924815C (fr) * 2013-09-20 2017-06-20 Proteus Digital Health, Inc. Procedes, dispositifs et systemes de reception et de decodage de signal en presence de bruit a l'aide de tranches et d'une distorsion

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3773981A (en) * 1972-08-07 1973-11-20 Ibm Parallel tone multiplexer-receiver
CA984068A (en) * 1972-08-10 1976-02-17 Alexander D. Proudfoot Method and apparatus for detecting the presence of signal components of predetermined frequency in a multi-frequency signal
NL7316990A (nl) * 1973-12-12 1975-06-16 Philips Nv Mfc-ontvanger voor digitale signaalverwerking.
FR2295665A1 (fr) * 1974-12-18 1976-07-16 Labo Cent Telecommunicat Recepteur numerique de signaux multifrequences
DE2515769A1 (de) * 1975-04-10 1976-10-21 Standard Elektrik Lorenz Ag Frequenzselektiver signalempfaenger

Also Published As

Publication number Publication date
IT1072242B (it) 1985-04-10
JPS5731342B2 (fr) 1982-07-03
AU3132077A (en) 1979-06-14
AR216659A1 (es) 1980-01-15
BR7707827A (pt) 1978-08-22
SE7714181L (sv) 1978-06-18
FR2374808A1 (fr) 1978-07-13
MX144395A (es) 1981-10-07
TR19857A (tr) 1980-03-01
FR2374808B1 (fr) 1982-03-19
GB1566164A (en) 1980-04-30
SE437102B (sv) 1985-02-04
DE2756251A1 (de) 1978-06-22
DE2756251C3 (de) 1981-11-19
DE2756251B2 (de) 1981-03-26
JPS53121408A (en) 1978-10-23

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