IT8319013A0 - Complesso e metodo per la rivelazione di segnali audio in codice, a piu' frequenze. - Google Patents

Complesso e metodo per la rivelazione di segnali audio in codice, a piu' frequenze.

Info

Publication number
IT8319013A0
IT8319013A0 IT8319013A IT1901383A IT8319013A0 IT 8319013 A0 IT8319013 A0 IT 8319013A0 IT 8319013 A IT8319013 A IT 8319013A IT 1901383 A IT1901383 A IT 1901383A IT 8319013 A0 IT8319013 A0 IT 8319013A0
Authority
IT
Italy
Prior art keywords
frequensies
complex
detection
audio signals
coded audio
Prior art date
Application number
IT8319013A
Other languages
English (en)
Other versions
IT1159807B (it
Inventor
Gerardus Antonius Mari Wolters
Original Assignee
Philips Nv
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 Philips Nv filed Critical Philips Nv
Publication of IT8319013A0 publication Critical patent/IT8319013A0/it
Application granted granted Critical
Publication of IT1159807B publication Critical patent/IT1159807B/it

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
    • 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
    • H04Q1/46—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Noise Elimination (AREA)
IT19013/83A 1982-01-08 1983-01-05 Complessoe metodo per la rivelazione di segnali audio in codice, a piu' frequenze IT1159807B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL8200051A NL8200051A (nl) 1982-01-08 1982-01-08 Inrichting en werkwijze voor het detecteren van multifrequentie tooncodesignalen.

Publications (2)

Publication Number Publication Date
IT8319013A0 true IT8319013A0 (it) 1983-01-05
IT1159807B IT1159807B (it) 1987-03-04

Family

ID=19839049

Family Applications (1)

Application Number Title Priority Date Filing Date
IT19013/83A IT1159807B (it) 1982-01-08 1983-01-05 Complessoe metodo per la rivelazione di segnali audio in codice, a piu' frequenze

Country Status (10)

Country Link
US (1) US4479229A (it)
JP (1) JPH0632487B2 (it)
BE (1) BE895549A (it)
CA (1) CA1193773A (it)
DE (1) DE3247401C2 (it)
FR (1) FR2519823B1 (it)
GB (1) GB2113880B (it)
IT (1) IT1159807B (it)
NL (1) NL8200051A (it)
SE (2) SE8300056L (it)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE892241A (fr) * 1982-02-23 1982-06-16 Dev Et D Industrialisation Des Circuit de calcul rapide de la transformee de fourier discrete d'un signal, destine notamment a un appareil de controle par courants de foucault.
NL8502008A (nl) * 1985-07-12 1987-02-02 Philips Nv Ontvanginrichting voor het onder bescherming van een stoorsignaal/spraaksignaalbewakingsfunctie herkennen van een aantal verschillende en voorafbepaalde frequentiecombinaties van toonfrequente signaleringscomponenten.
US4670875A (en) * 1985-08-09 1987-06-02 Dale Nassar Multiplexed dual tone multi-frequency encoding/decoding system for remote control applications
JPS62204652A (ja) * 1986-03-04 1987-09-09 Nec Corp 可聴周波信号識別方式
DE3710695A1 (de) * 1987-03-31 1988-10-20 Nixdorf Computer Ag Schaltungsanordnung zum erkennen von doppelton-mehrfrequenzsignalen in fernsprechanlagen
JPH01277899A (ja) * 1988-04-30 1989-11-08 Oki Electric Ind Co Ltd 音声帯域内信号検出方式
DE4032369C1 (it) * 1990-10-12 1992-01-30 Telenorma Gmbh, 6000 Frankfurt, De
FR2676880B1 (fr) * 1991-05-24 1994-12-30 France Telecom Analyseur modulaire de trafic de signaux numeriques.
FI89437C (fi) * 1991-11-01 1993-09-27 Nokia Mobile Phones Ltd Digitaldetektor foer ett soekaranlaeggningsystem
US5321745A (en) * 1992-05-26 1994-06-14 Vmx, Inc. Adaptive efficient single/dual tone decoder apparatus and method for identifying call-progression signals
US6233237B1 (en) * 1998-02-02 2001-05-15 3Com Corporation Method and protocol for connecting data calls using R2 signaling

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3104393A (en) * 1961-10-18 1963-09-17 Joseph H Vogelman Method and apparatus for phase and amplitude control in ionospheric communications systems
US3710257A (en) * 1971-03-17 1973-01-09 G Low Multichannel telemetry system
US3810019A (en) * 1972-09-25 1974-05-07 Sperry Rand Corp Multifrequency communication system for fading channels
FR2299769A1 (fr) * 1975-01-31 1976-08-27 Telecommunications Sa Procede d'application
NL7903346A (nl) * 1979-04-27 1980-10-29 Bell Telephone Mfg Digitaal signaleringsstelsel.

Also Published As

Publication number Publication date
GB2113880B (en) 1985-10-09
SE8300056D0 (sv) 1983-01-05
BE895549A (fr) 1983-07-06
US4479229A (en) 1984-10-23
JPS58123293A (ja) 1983-07-22
FR2519823B1 (fr) 1990-05-04
GB2113880A (en) 1983-08-10
DE3247401C2 (de) 1985-03-14
GB8300127D0 (en) 1983-02-09
SE8300056L (sv) 1983-07-09
CA1193773A (en) 1985-09-17
IT1159807B (it) 1987-03-04
SE455563B (sv) 1988-07-18
FR2519823A1 (fr) 1983-07-18
JPH0632487B2 (ja) 1994-04-27
NL8200051A (nl) 1983-08-01
DE3247401A1 (de) 1983-07-21

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Legal Events

Date Code Title Description
TA Fee payment date (situation as of event date), data collected since 19931001

Effective date: 19960130