BE875698A - Toondecodeerschakeling - Google Patents

Toondecodeerschakeling

Info

Publication number
BE875698A
BE875698A BE0/194701A BE194701A BE875698A BE 875698 A BE875698 A BE 875698A BE 0/194701 A BE0/194701 A BE 0/194701A BE 194701 A BE194701 A BE 194701A BE 875698 A BE875698 A BE 875698A
Authority
BE
Belgium
Prior art keywords
display coding
coding
display
Prior art date
Application number
BE0/194701A
Other languages
English (en)
Original Assignee
Mitel 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
Application filed by Mitel Corp filed Critical Mitel Corp
Publication of BE875698A publication Critical patent/BE875698A/nl

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)
  • Measurement Of Current Or Voltage (AREA)
  • Networks Using Active Elements (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Devices For Supply Of Signal Current (AREA)
BE0/194701A 1978-10-06 1979-04-19 Toondecodeerschakeling BE875698A (nl)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA312,903A CA1112381A (en) 1978-10-06 1978-10-06 Tone decoding circuit

Publications (1)

Publication Number Publication Date
BE875698A true BE875698A (nl) 1979-08-16

Family

ID=4112559

Family Applications (1)

Application Number Title Priority Date Filing Date
BE0/194701A BE875698A (nl) 1978-10-06 1979-04-19 Toondecodeerschakeling

Country Status (11)

Country Link
US (1) US4273965A (nl)
JP (1) JPS5585183A (nl)
BE (1) BE875698A (nl)
CA (1) CA1112381A (nl)
DE (1) DE2912566A1 (nl)
DK (1) DK126479A (nl)
FR (1) FR2438403B1 (nl)
GB (1) GB2032151B (nl)
NL (1) NL7902645A (nl)
NO (1) NO154210C (nl)
SE (1) SE439717B (nl)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4604755A (en) * 1984-06-01 1986-08-05 International Business Machines Corp. Feed forward dual channel automatic level control for dual tone multi-frequency receivers
US4653093A (en) * 1985-07-26 1987-03-24 Floyd Bell Associates, Inc. Frequency selective ringer circuit
US5095504A (en) * 1987-10-01 1992-03-10 Canon Kabushiki Kaisha Telephone and telephone system having temporary transfer and hold-release functions
US5699421A (en) * 1995-05-31 1997-12-16 Casio Phonemate, Inc. Telephone answering device with low cost dual tone multi-frequency detector
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
CN109709383A (zh) * 2019-03-14 2019-05-03 贵州电网有限责任公司 一种过电压监测装置的触发单元结构

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3806664A (en) * 1972-09-13 1974-04-23 Bell Telephone Labor Inc Tone receiver with detection of each tone in a precise frequency band
US3780230A (en) * 1972-11-10 1973-12-18 Bell Telephone Labor Inc Multifrequency tone receiver

Also Published As

Publication number Publication date
SE439717B (sv) 1985-06-24
DE2912566A1 (de) 1980-04-24
NL7902645A (nl) 1980-04-09
FR2438403A1 (fr) 1980-04-30
NO154210C (no) 1986-08-13
SE7902607L (sv) 1980-04-07
GB2032151A (en) 1980-04-30
CA1112381A (en) 1981-11-10
DK126479A (da) 1980-04-07
JPS5585183A (en) 1980-06-26
GB2032151B (en) 1983-03-23
US4273965A (en) 1981-06-16
NO790745L (no) 1980-04-09
NO154210B (no) 1986-04-28
FR2438403B1 (fr) 1986-12-12

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Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: MITEL DATACOM INC.

Effective date: 19880430