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NO154210C - Tonedekoder. - Google Patents

Tonedekoder.

Info

Publication number
NO154210C
NO154210C NO790745A NO790745A NO154210C NO 154210 C NO154210 C NO 154210C NO 790745 A NO790745 A NO 790745A NO 790745 A NO790745 A NO 790745A NO 154210 C NO154210 C NO 154210C
Authority
NO
Norway
Prior art keywords
tone decoder
tone
decoder
Prior art date
Application number
NO790745A
Other languages
English (en)
Norwegian (no)
Other versions
NO154210B (no
NO790745L (no
Inventor
Michael C J Cowpland
Patrick R Beirne
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 NO790745L publication Critical patent/NO790745L/no
Publication of NO154210B publication Critical patent/NO154210B/no
Publication of NO154210C publication Critical patent/NO154210C/no

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)
  • Devices For Supply Of Signal Current (AREA)
  • Networks Using Active Elements (AREA)
  • Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
NO790745A 1978-10-06 1979-03-06 Tonedekoder. NO154210C (no)

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 (3)

Publication Number Publication Date
NO790745L NO790745L (no) 1980-04-09
NO154210B NO154210B (no) 1986-04-28
NO154210C true NO154210C (no) 1986-08-13

Family

ID=4112559

Family Applications (1)

Application Number Title Priority Date Filing Date
NO790745A NO154210C (no) 1978-10-06 1979-03-06 Tonedekoder.

Country Status (11)

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

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
DK126479A (da) 1980-04-07
NO154210B (no) 1986-04-28
SE439717B (sv) 1985-06-24
GB2032151B (en) 1983-03-23
NO790745L (no) 1980-04-09
BE875698A (nl) 1979-08-16
SE7902607L (sv) 1980-04-07
FR2438403B1 (fr) 1986-12-12
GB2032151A (en) 1980-04-30
CA1112381A (en) 1981-11-10
DE2912566A1 (de) 1980-04-24
US4273965A (en) 1981-06-16
NL7902645A (nl) 1980-04-09
JPS5585183A (en) 1980-06-26
FR2438403A1 (fr) 1980-04-30

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