CA2027766A1 - Recepteur de signaux multifrequence et methode de detection de ces signaux - Google Patents

Recepteur de signaux multifrequence et methode de detection de ces signaux

Info

Publication number
CA2027766A1
CA2027766A1 CA2027766A CA2027766A CA2027766A1 CA 2027766 A1 CA2027766 A1 CA 2027766A1 CA 2027766 A CA2027766 A CA 2027766A CA 2027766 A CA2027766 A CA 2027766A CA 2027766 A1 CA2027766 A1 CA 2027766A1
Authority
CA
Canada
Prior art keywords
frequency signal
amplitude
circuit
signal
input signal
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.)
Granted
Application number
CA2027766A
Other languages
English (en)
Other versions
CA2027766C (fr
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
Individual
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 Individual filed Critical Individual
Publication of CA2027766A1 publication Critical patent/CA2027766A1/fr
Application granted granted Critical
Publication of CA2027766C publication Critical patent/CA2027766C/fr
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)
CA002027766A 1989-10-18 1990-10-16 Recepteur de signaux multifrequence et methode de detection de ces signaux Expired - Fee Related CA2027766C (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP01-269236 1989-10-18
JP1269236A JPH03132291A (ja) 1989-10-18 1989-10-18 Ｐｂ信号検出方式

Publications (2)

Publication Number Publication Date
CA2027766A1 true CA2027766A1 (fr) 1991-04-19
CA2027766C CA2027766C (fr) 1994-12-13

Family

ID=17469557

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002027766A Expired - Fee Related CA2027766C (fr) 1989-10-18 1990-10-16 Recepteur de signaux multifrequence et methode de detection de ces signaux

Country Status (5)

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

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 (fr) * 1996-01-26 1998-01-14 Koninklijke Philips Electronics N.V. Systeme de transmission a detection amelioree de frequence vocale
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
WO2016007528A1 (fr) * 2014-07-10 2016-01-14 Analog Devices Global Détection à faible complexité d'une activité vocale

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3743945A (en) * 1970-12-23 1973-07-03 Itt Limiter for multi frequency voice 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
DE69026185D1 (de) 1996-05-02
EP0423787A2 (fr) 1991-04-24
CA2027766C (fr) 1994-12-13
EP0423787A3 (en) 1992-02-26
EP0423787B1 (fr) 1996-03-27
JPH03132291A (ja) 1991-06-05
DE69026185T2 (de) 1996-09-05
US5214693A (en) 1993-05-25

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