CA1155985A - Digital pushbutton signalling receiver - Google Patents

Digital pushbutton signalling receiver

Info

Publication number
CA1155985A
CA1155985A CA000375974A CA375974A CA1155985A CA 1155985 A CA1155985 A CA 1155985A CA 000375974 A CA000375974 A CA 000375974A CA 375974 A CA375974 A CA 375974A CA 1155985 A CA1155985 A CA 1155985A
Authority
CA
Canada
Prior art keywords
frequencies
signals
signal
band
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
Application number
CA000375974A
Other languages
English (en)
French (fr)
Inventor
Tadaharu Kato
Takao Nishitani
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.)
NEC Corp
Original Assignee
Nippon Electric Co 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
Priority claimed from JP5389380A external-priority patent/JPS56149889A/ja
Priority claimed from JP5741680A external-priority patent/JPS56153897A/ja
Application filed by Nippon Electric Co Ltd filed Critical Nippon Electric Co Ltd
Application granted granted Critical
Publication of CA1155985A publication Critical patent/CA1155985A/en
Expired 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
    • H04Q1/457—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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Circuits Of Receivers In General (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
CA000375974A 1980-04-23 1981-04-22 Digital pushbutton signalling receiver Expired CA1155985A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP5389380A JPS56149889A (en) 1980-04-23 1980-04-23 Push-botton telephone signal receiving system
JP53893/1980 1980-04-23
JP5741680A JPS56153897A (en) 1980-04-30 1980-04-30 Receiving device for push-button telephone signal
JP57416/1980 1980-04-30

Publications (1)

Publication Number Publication Date
CA1155985A true CA1155985A (en) 1983-10-25

Family

ID=26394617

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000375974A Expired CA1155985A (en) 1980-04-23 1981-04-22 Digital pushbutton signalling receiver

Country Status (3)

Country Link
US (1) US4395595A (enExample)
CA (1) CA1155985A (enExample)
FR (1) FR2481542A1 (enExample)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4626629A (en) * 1984-12-14 1986-12-02 Gte Communication Systems Corporation Digital multifrequency signal receiver
SE9202065L (sv) * 1992-07-03 1994-01-04 Ericsson Telefon Ab L M Sätt att förbättra mottagarens känslighet och talimmuniteten vid DTMF-mottagning
JP2851974B2 (ja) * 1992-08-07 1999-01-27 シャープ株式会社 Ｄｔｍｆ信号判定回路
JP2908168B2 (ja) * 1993-03-15 1999-06-21 シャープ株式会社 信号識別回路
WO1996025825A1 (en) * 1995-02-13 1996-08-22 Cidco, Incorporated Method and structure for detecting a customer premises equipment alerting signal
US5619564A (en) * 1995-05-31 1997-04-08 Lucent Technologies Inc. Tone detector with improved performance in the presence of speech
KR0149759B1 (ko) * 1995-11-20 1998-11-02 김광호 디지탈신호 처리칩을 이용한 디티엠프 검출기 및 구현방법
JPH11502999A (ja) * 1996-01-26 1999-03-09 フィリップス エレクトロニクス ネムローゼ フェンノートシャップ トーン検出を改善した伝送システム
RU2128400C1 (ru) * 1997-02-28 1999-03-27 Войсковая часть 35533 Устройство для приема многочастотных сигналов
RU2128401C1 (ru) * 1997-02-28 1999-03-27 Войсковая часть 35533 Устройство для приема многочастотных сигналов
US5995557A (en) * 1997-06-12 1999-11-30 Nortel Networks Corporation Tone detection with aliasing bandpass filters
RU2178950C2 (ru) * 2000-01-20 2002-01-27 в/ч 35533 Устройство для приема сигналов тонального набора
RU2169436C1 (ru) * 2000-01-20 2001-06-20 Войсковая часть 35533 Устройство для приема многочастотных сигналов
RU2174739C1 (ru) * 2000-01-20 2001-10-10 Войсковая часть 35533 Устройство для декодирования двухчастотных сигналов
RU2171549C1 (ru) * 2000-01-26 2001-07-27 Войсковая часть 35533 Устройство для выделения акустических сигналов в каналах связи
RU2214051C2 (ru) * 2001-01-22 2003-10-10 Войсковая часть 35533 Устройство для выделения тональных сигналов в каналах связи

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE397763B (sv) * 1976-03-09 1977-11-14 Ericsson Telefon Ab L M Mottagaranordning for storningskenslig detektering av atminstone tva tonfrekvenser i en inkommande tonsignal
JPS6017279B2 (ja) * 1978-12-06 1985-05-01 株式会社日立製作所 多周波信号受信装置

Also Published As

Publication number Publication date
US4395595A (en) 1983-07-26
FR2481542B1 (enExample) 1984-05-18
FR2481542A1 (fr) 1981-10-30

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Legal Events

Date Code Title Description
MKEX Expiry