SE437102B - Forfarande for detektering av digitala flerfrekvenskodade insignaler av pcm-typ och digital mottagare for genomforande av forfarandet - Google Patents

Forfarande for detektering av digitala flerfrekvenskodade insignaler av pcm-typ och digital mottagare for genomforande av forfarandet

Info

Publication number
SE437102B
SE437102B SE7714181A SE7714181A SE437102B SE 437102 B SE437102 B SE 437102B SE 7714181 A SE7714181 A SE 7714181A SE 7714181 A SE7714181 A SE 7714181A SE 437102 B SE437102 B SE 437102B
Authority
SE
Sweden
Prior art keywords
signal
signals
amplitude
value
received signal
Prior art date
Application number
SE7714181A
Other languages
English (en)
Swedish (sv)
Other versions
SE7714181L (sv
Inventor
F Melindo
R Rocci
Original Assignee
Cselt Centro Studi Lab Telecom
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 Lab Telecom filed Critical Cselt Centro Studi Lab Telecom
Publication of SE7714181L publication Critical patent/SE7714181L/
Publication of SE437102B publication Critical patent/SE437102B/sv

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)
SE7714181A 1976-12-17 1977-12-14 Forfarande for detektering av digitala flerfrekvenskodade insignaler av pcm-typ och digital mottagare for genomforande av forfarandet SE437102B (sv)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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
SE7714181L SE7714181L (sv) 1978-06-18
SE437102B true SE437102B (sv) 1985-02-04

Family

ID=11313285

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7714181A SE437102B (sv) 1976-12-17 1977-12-14 Forfarande for detektering av digitala flerfrekvenskodade insignaler av pcm-typ och digital mottagare for genomforande av forfarandet

Country Status (11)

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

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 (en) * 1979-02-22 1981-10-27 Jackylene K. Hood Digital signalling receiver for receiving pcm tones
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 (it) * 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
RU2736776C2 (ru) * 2013-09-20 2020-11-20 Протеус Диджитал Хелс, Инк. Способы, устройства и системы приема и декодирования сигналов в присутствии шума с использованием срезов и деформирования

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
DE2756251A1 (de) 1978-06-22
IT1072242B (it) 1985-04-10
FR2374808B1 (it) 1982-03-19
AU3132077A (en) 1979-06-14
SE7714181L (sv) 1978-06-18
GB1566164A (en) 1980-04-30
AR216659A1 (es) 1980-01-15
FR2374808A1 (fr) 1978-07-13
BR7707827A (pt) 1978-08-22
JPS5731342B2 (it) 1982-07-03
DE2756251B2 (de) 1981-03-26
AU507727B2 (en) 1980-02-28
DE2756251C3 (de) 1981-11-19
TR19857A (tr) 1980-03-01
JPS53121408A (en) 1978-10-23
MX144395A (es) 1981-10-07

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