DE69026185D1 - Mehrfrequenzsignal-Empfänger und Verfahren zu dessen Erkennung - Google Patents

Mehrfrequenzsignal-Empfänger und Verfahren zu dessen Erkennung

Info

Publication number
DE69026185D1
DE69026185D1 DE69026185T DE69026185T DE69026185D1 DE 69026185 D1 DE69026185 D1 DE 69026185D1 DE 69026185 T DE69026185 T DE 69026185T DE 69026185 T DE69026185 T DE 69026185T DE 69026185 D1 DE69026185 D1 DE 69026185D1
Authority
DE
Germany
Prior art keywords
detection
frequency signal
signal receiver
receiver
frequency
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 - Fee Related
Application number
DE69026185T
Other languages
English (en)
Other versions
DE69026185T2 (de
Inventor
Kaoru Chujo
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Publication of DE69026185D1 publication Critical patent/DE69026185D1/de
Application granted granted Critical
Publication of DE69026185T2 publication Critical patent/DE69026185T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Telephonic Communication Services (AREA)
  • Circuits Of Receivers In General (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
DE69026185T 1989-10-18 1990-10-18 Mehrfrequenzsignal-Empfänger und Verfahren zu dessen Erkennung Expired - Fee Related DE69026185T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1269236A JPH03132291A (ja) 1989-10-18 1989-10-18 Ｐｂ信号検出方式

Publications (2)

Publication Number Publication Date
DE69026185D1 true DE69026185D1 (de) 1996-05-02
DE69026185T2 DE69026185T2 (de) 1996-09-05

Family

ID=17469557

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69026185T Expired - Fee Related DE69026185T2 (de) 1989-10-18 1990-10-18 Mehrfrequenzsignal-Empfänger und Verfahren zu dessen Erkennung

Country Status (5)

Country Link
US (1) US5214693A (de)
EP (1) EP0423787B1 (de)
JP (1) JPH03132291A (de)
CA (1) CA2027766C (de)
DE (1) DE69026185T2 (de)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2744357B2 (ja) * 1991-04-23 1998-04-28 キヤノン株式会社 構内交換装置
CH682783A5 (de) * 1991-09-24 1993-11-15 Alcatel Str Ag Verfahren zur Pegelbestimmung bei vorbestimmten Frequenzen eines Tonfrequenzsignales.
US5588052A (en) * 1991-11-19 1996-12-24 Sharp Kabushiki Kaisha DTMF signal judging apparatus
US5392348A (en) * 1991-11-25 1995-02-21 Motorola, Inc. DTMF detection having sample rate decimation and adaptive tone detection
JP3027047B2 (ja) * 1992-01-29 2000-03-27 キヤノン株式会社 Ｄｔｍｆ信号検出装置及び方法
JP2851974B2 (ja) * 1992-08-07 1999-01-27 シャープ株式会社 Ｄｔｍｆ信号判定回路
US5408529A (en) * 1993-06-02 1995-04-18 Motorola, Inc. Dual tone detector operable in the presence of speech or background noise and method therefor
US5692040A (en) * 1994-06-30 1997-11-25 Greenblatt; Richard David Method of and apparatus for exchanging compatible universal identification telephone protocols over a public switched telephone network
JPH08213881A (ja) * 1995-02-02 1996-08-20 Fujitsu Ltd 周波数制御回路
US5631957A (en) * 1995-03-09 1997-05-20 National Semiconductor Corporation Band-energy near-end echo reducer for tonal signalling detectors
US5619564A (en) * 1995-05-31 1997-04-08 Lucent Technologies Inc. Tone detector with improved performance in the presence of speech
JP3452430B2 (ja) * 1995-09-11 2003-09-29 富士通株式会社 情報信号検出装置および情報信号検出方法
KR0149759B1 (ko) * 1995-11-20 1998-11-02 김광호 디지탈신호 처리칩을 이용한 디티엠프 검출기 및 구현방법
EP0818113A1 (de) * 1996-01-26 1998-01-14 Koninklijke Philips Electronics N.V. Übertragungssystem mit verbesserter tonerkennung
US5742527A (en) * 1996-03-15 1998-04-21 Motorola, Inc. Flexible asymmetrical digital subscriber line (ADSL) receiver, central office using same, and method therefor
US5878131A (en) * 1996-11-18 1999-03-02 At&T Corp Interference attenuation for acoustic-dialers
US6370244B1 (en) 1998-04-03 2002-04-09 Board Of Regents Of The University Of Texas System Efficient digital ITU-compliant zero-buffering DTMF detection using the non-uniform discrete fourier transform
US6940966B2 (en) * 2002-02-21 2005-09-06 Vtech Telecommunications, Ltd. Method and apparatus for detection of a telephone CPE alerting signal
US10360926B2 (en) 2014-07-10 2019-07-23 Analog Devices Global Unlimited Company Low-complexity voice activity detection

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710031A (en) * 1970-12-23 1973-01-09 Itt Multi frequency receiver
CA976675A (en) * 1972-10-16 1975-10-21 Microsystems International Limited Dual tone receiver
US3812432A (en) * 1973-01-05 1974-05-21 Bell Telephone Labor Inc Tone detector
US3845249A (en) * 1973-03-09 1974-10-29 Itt Multi-frequency receiver
US3944753A (en) * 1974-10-31 1976-03-16 Proctor & Associates Company Apparatus for distinguishing voice and other noise signals from legitimate multi-frequency tone signals present on telephone or similar communication lines
JPS5391612A (en) * 1977-01-24 1978-08-11 Nec Corp Receiver for multiple frequency signal
US4206323A (en) * 1978-08-31 1980-06-03 Harris Corporation Dual tone multifrequency signal receiver
US4386239A (en) * 1980-06-17 1983-05-31 Bell Telephone Laboratories, Incorporated Multifrequency tone detector
US4484035A (en) * 1980-09-29 1984-11-20 Transwave Dual tone multi frequency digital detector
US4385208A (en) * 1981-04-15 1983-05-24 Bell Telephone Laboratories, Incorporated Multifrequency receiver
US4455617A (en) * 1982-08-30 1984-06-19 Motorola, Inc. Multiple simultaneous tone decoder
US4626629A (en) * 1984-12-14 1986-12-02 Gte Communication Systems Corporation Digital multifrequency signal receiver
US4599495A (en) * 1985-02-28 1986-07-08 Northern Telecom Limited Apparatus for multifrequency signalling tone detection
JPS62144493A (ja) * 1985-12-19 1987-06-27 Nec Corp 多周波信号受信器
US4696031A (en) * 1985-12-31 1987-09-22 Wang Laboratories, Inc. Signal detection and discrimination using waveform peak factor
JPH01138889A (ja) * 1987-11-26 1989-05-31 Nec Corp デイジタルｐｂ信号受信器
JPH01188194A (ja) * 1988-01-22 1989-07-27 Nec Corp ディジタルｐｂ信号受信器
JPH01243690A (ja) * 1988-03-24 1989-09-28 Fujitsu Ltd 多周波信号受信器
JPH01305694A (ja) * 1988-06-03 1989-12-08 Hitachi Ltd Ｐｂ信号受信方式

Also Published As

Publication number Publication date
EP0423787A2 (de) 1991-04-24
EP0423787B1 (de) 1996-03-27
DE69026185T2 (de) 1996-09-05
CA2027766C (en) 1994-12-13
CA2027766A1 (en) 1991-04-19
US5214693A (en) 1993-05-25
EP0423787A3 (en) 1992-02-26
JPH03132291A (ja) 1991-06-05

Similar Documents

Publication Publication Date Title
DE69026185D1 (de) Mehrfrequenzsignal-Empfänger und Verfahren zu dessen Erkennung
DE69017923D1 (de) Verfahren und Einrichtung zum Detektieren von nach aussen gerichteten Signalen.
DE69228108D1 (de) Verfahren und Vorrichtung zum Empfang von Informationssignalen
DE69408615D1 (de) Verfahren und Vorrichtung zur Erfassung von seismischen Signalen
DE69624698D1 (de) Verfahren zum empfang und suchen eines in bursts ausgesandten signals
DE69633705D1 (de) Verfahren zum Erfassen eines digitalen Signals und Detektor
DE69420593D1 (de) Verfahren und Vorrichtung zum Erfassen von seismischen Signalen
DE69217862D1 (de) Schaltungsanordnung und Verfahren zur Zweitonmehrfrequenzerkennung
EP0411966A3 (en) Position detection method and apparatus
DE68925529D1 (de) Abschätzung-positionierungssystem und verfahren
EP0413330A3 (en) Method and apparatus for detecting photoacoustic signal
DE59205867D1 (de) Verfahren zur Erkennung von Verbrennungsaussetzern
DE69330682D1 (de) Verfahren zur Erkennung von Fehlzündungen
DE59406291D1 (de) Verfahren zur klopferkennung
DE69014658D1 (de) Verfahren und Vorrichtung zur Signalgewinnung.
DE69021196D1 (de) Verfahren und vorrichtung zur kompandierung eines signals.
DE69029658D1 (de) Verfahren und Einrichtung zur Kompression eines Kommunikationssignals
DE69129890D1 (de) Verfahren und Vorrichtung zur Bestimmung der Phasenkorrelation eines stereophonischen Signals
DE69129732D1 (de) Verfahren zur Positionsdetektion
DE69111626D1 (de) Verfahren und Vorrichtung zur Prüfung der Spannungsfestigkeit.
DE68912226D1 (de) System und Verfahren zum Breitspektrum-Drogennachweis.
DE69527703D1 (de) Verfahren und Vorrichtung zur Signalauswahl und Fehlererkennung
ATA30290A (de) Verfahren und einrichtung zur signalauswertung
DE3581503D1 (de) Geraet und verfahren zur ortung von signalausfaellen.
DE69225345D1 (de) Eine Signalverarbeitungseinrichtung und ein Verfahren zum Übertragen von Signalen

Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee