DE3483095D1 - Vorrichtung zum erzeugen von dtmf-signalen. - Google Patents

Vorrichtung zum erzeugen von dtmf-signalen.

Info

Publication number
DE3483095D1
DE3483095D1 DE8484115872T DE3483095T DE3483095D1 DE 3483095 D1 DE3483095 D1 DE 3483095D1 DE 8484115872 T DE8484115872 T DE 8484115872T DE 3483095 T DE3483095 T DE 3483095T DE 3483095 D1 DE3483095 D1 DE 3483095D1
Authority
DE
Germany
Prior art keywords
dtmf signals
generating dtmf
generating
signals
dtmf
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 - Lifetime
Application number
DE8484115872T
Other languages
English (en)
Inventor
Eiji C O Patent Divisio Masuda
Yasuhiko C O Patent Div Fujita
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 JP24411683A external-priority patent/JPS60136459A/ja
Priority claimed from JP24411783A external-priority patent/JPS60136460A/ja
Priority claimed from JP24411883A external-priority patent/JPS60136461A/ja
Application filed by Toshiba Corp filed Critical Toshiba Corp
Application granted granted Critical
Publication of DE3483095D1 publication Critical patent/DE3483095D1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
    • H04M1/505—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies signals generated in digital form

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Manipulation Of Pulses (AREA)
  • Electrophonic Musical Instruments (AREA)
DE8484115872T 1983-12-26 1984-12-19 Vorrichtung zum erzeugen von dtmf-signalen. Expired - Lifetime DE3483095D1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP24411683A JPS60136459A (ja) 1983-12-26 1983-12-26 Ｄｔｍｆ信号発生装置
JP24411783A JPS60136460A (ja) 1983-12-26 1983-12-26 Ｄｔｍｆ信号発生装置
JP24411883A JPS60136461A (ja) 1983-12-26 1983-12-26 Ｄｔｍｆ信号発生装置

Publications (1)

Publication Number Publication Date
DE3483095D1 true DE3483095D1 (de) 1990-10-04

Family

ID=27333204

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8484115872T Expired - Lifetime DE3483095D1 (de) 1983-12-26 1984-12-19 Vorrichtung zum erzeugen von dtmf-signalen.

Country Status (3)

Country Link
US (1) US4639554A (de)
EP (1) EP0147791B1 (de)
DE (1) DE3483095D1 (de)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02249345A (ja) * 1988-08-29 1990-10-05 Ind Technol Res Inst デュアルトーンマルチ周波数発生器
US5208852A (en) * 1988-09-27 1993-05-04 Seiko Epson Corporation Sound generation circuit
US5034977A (en) * 1989-04-04 1991-07-23 Industrial Technology Research Institute Phase accumulation dual tone multiple frequency generator
US5907597A (en) * 1994-08-05 1999-05-25 Smart Tone Authentication, Inc. Method and system for the secure communication of data
US5802112A (en) * 1996-01-16 1998-09-01 Transcendat Inc. Multi-level, multi-frequency interference pattern analog waveform encoding of digital data for transmission
EP0876725A1 (de) * 1996-01-16 1998-11-11 Transcendata, Inc. Kodierung digitaler daten zur übertragung von analogen wellenformen mit mehrpegeligen-, mehrfrequenz-interferenzmustern
GB2317063B (en) * 1996-09-03 1999-03-03 Holtek Microelectronics Inc An adjustable-period dual-tone multifrequency generator
SE508136C2 (sv) * 1996-12-19 1998-08-31 Ericsson Telefon Ab L M Anordning och förfarande för tangentbordsavläsning
KR100206473B1 (ko) 1996-12-31 1999-07-01 윤종용 전자교환기의 톤 발생장치
US6038262A (en) * 1998-06-09 2000-03-14 Transcendata, Inc. Method and apparatus for compensation of electro-magnetic distortion using weighted feedback delay for amplitude coded sinusoidal waveform generation and transmission
JP2001024748A (ja) 1999-07-08 2001-01-26 Uniden Corp Ｄｔｍｆ信号発生回路
CN115208422B (zh) * 2022-09-14 2022-11-18 成都益为创科技有限公司 一种采用双音信号混频的射频收发系统

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3820028A (en) * 1971-08-27 1974-06-25 J Thomas Digital tone signal generator
FR2286564A1 (fr) * 1974-09-30 1976-04-23 Roche Bernard Dispositif synthetiseur de signaux a multifrequences
US4315108A (en) * 1975-09-29 1982-02-09 Mostek Corporation Integrated circuit chip telephone communication system
FR2368843A1 (fr) * 1976-10-22 1978-05-19 Constr Telephoniques Emetteur de signaux multifrequences
FR2452823A1 (fr) * 1979-03-30 1980-10-24 Texas Instruments France Generateur de signaux a basse frequence, notamment de signaux de tonalite pour communications telephoniques

Also Published As

Publication number Publication date
EP0147791B1 (de) 1990-08-29
US4639554A (en) 1987-01-27
EP0147791A3 (en) 1988-07-13
EP0147791A2 (de) 1985-07-10

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Legal Events

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