SE7714181L - DETECTION OF TELEPHONE SIGNALS - Google Patents

DETECTION OF TELEPHONE SIGNALS

Info

Publication number
SE7714181L
SE7714181L SE7714181A SE7714181A SE7714181L SE 7714181 L SE7714181 L SE 7714181L SE 7714181 A SE7714181 A SE 7714181A SE 7714181 A SE7714181 A SE 7714181A SE 7714181 L SE7714181 L SE 7714181L
Authority
SE
Sweden
Prior art keywords
detection
telephone signals
telephone
signals
Prior art date
Application number
SE7714181A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE437102B (en
Inventor
F Melindo
R Rocci
Original Assignee
Studio E Lab Telecomunicazioni
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 Studio E Lab Telecomunicazioni filed Critical Studio E Lab Telecomunicazioni
Publication of SE7714181L publication Critical patent/SE7714181L/en
Publication of SE437102B publication Critical patent/SE437102B/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
    • 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 PROCEDURE FOR DETECTING DIGITAL MULTI FREQUENCY CODED INPUTS OF PCM TYPE AND DIGITAL RECEIVER FOR IMPLEMENTATION OF THE PROCEDURE SE437102B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT7000776A IT1072242B (en) 1976-12-17 1976-12-17 PROCEDURE AND DEVICE FOR THE RECOGNITION OF TELEPHONE SIGNALS IN MULTIFREQUENCY CODE CONVERTED IN NUMERICAL FORM

Publications (2)

Publication Number Publication Date
SE7714181L true SE7714181L (en) 1978-06-18
SE437102B SE437102B (en) 1985-02-04

Family

ID=11313285

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7714181A SE437102B (en) 1976-12-17 1977-12-14 PROCEDURE FOR DETECTING DIGITAL MULTI FREQUENCY CODED INPUTS OF PCM TYPE AND DIGITAL RECEIVER FOR IMPLEMENTATION OF THE PROCEDURE

Country Status (11)

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

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2440126A1 (en) * 1978-10-27 1980-05-23 Materiel Telephonique RECOGNITION DEVICE AND METHOD FOR A DIGITAL MULTI-FREQUENCY SIGNAL RECEIVER
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 (en) * 1979-04-27 1980-10-29 Bell Telephone Mfg DIGITAL SIGNALING SYSTEM.
FR2479631B1 (en) * 1980-03-28 1986-07-25 Cit Alcatel SIGNAL CONFIRMATION DEVICE
FR2485843B1 (en) * 1980-06-25 1986-11-07 Cit Alcatel DIGITAL FREQUENCY RECEIVER
IT1148885B (en) * 1980-07-09 1986-12-03 Sits Soc It Telecom Siemens MULTIFREQUENCY TYPE SIGNALING CONTROL UNIT, OF PARTICULAR APPLICATION IN TELEPHONE UNITS FOR NUMERIC TYPES OF TRANSIT
US4385208A (en) * 1981-04-15 1983-05-24 Bell Telephone Laboratories, Incorporated Multifrequency receiver
DE3424327A1 (en) * 1984-07-02 1986-01-09 Philips Patentverwaltung Gmbh, 2000 Hamburg Method and circuit arrangement for identifying the envelope curves of signal components of a multi-frequency coded dial signal
CH672968A5 (en) * 1984-11-30 1990-01-15 Autophon Ascom Ag
JPS61225929A (en) * 1985-03-30 1986-10-07 Fujitsu Ltd Method for generating digital tone
US4783845A (en) * 1985-12-20 1988-11-08 Itt Aerospace Optical Digital tone squelch detector
JPS62204652A (en) * 1986-03-04 1987-09-09 Nec Corp Audible frequency signal identification system
EP3047618B1 (en) * 2013-09-20 2023-11-08 Otsuka Pharmaceutical Co., Ltd. Methods, devices and systems for receiving and decoding a signal in the presence of noise using slices and warping

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 (en) * 1973-12-12 1975-06-16 Philips Nv MFC RECEIVER FOR DIGITAL SIGNAL PROCESSING.
FR2295665A1 (en) * 1974-12-18 1976-07-16 Labo Cent Telecommunicat MULTI-FREQUENCY DIGITAL SIGNAL RECEIVER
DE2515769A1 (en) * 1975-04-10 1976-10-21 Standard Elektrik Lorenz Ag FREQUENCY SELECTIVE SIGNAL RECEIVER

Also Published As

Publication number Publication date
AU3132077A (en) 1979-06-14
DE2756251B2 (en) 1981-03-26
AU507727B2 (en) 1980-02-28
FR2374808A1 (en) 1978-07-13
DE2756251A1 (en) 1978-06-22
AR216659A1 (en) 1980-01-15
MX144395A (en) 1981-10-07
SE437102B (en) 1985-02-04
DE2756251C3 (en) 1981-11-19
JPS5731342B2 (en) 1982-07-03
TR19857A (en) 1980-03-01
JPS53121408A (en) 1978-10-23
FR2374808B1 (en) 1982-03-19
GB1566164A (en) 1980-04-30
BR7707827A (en) 1978-08-22
IT1072242B (en) 1985-04-10

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