NO139304C - Anordning for detektering av et tonesignal hvis frekvens ligger innenfor et visst tonefrekvensbaand - Google Patents

Anordning for detektering av et tonesignal hvis frekvens ligger innenfor et visst tonefrekvensbaand

Info

Publication number
NO139304C
NO139304C NO763369A NO763369A NO139304C NO 139304 C NO139304 C NO 139304C NO 763369 A NO763369 A NO 763369A NO 763369 A NO763369 A NO 763369A NO 139304 C NO139304 C NO 139304C
Authority
NO
Norway
Prior art keywords
frequency
tone
detecting
certain
frequency range
Prior art date
Application number
NO763369A
Other languages
English (en)
Norwegian (no)
Other versions
NO763369L (it
NO139304B (no
Inventor
Bengt Gustav Loefmark
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Publication of NO763369L publication Critical patent/NO763369L/no
Publication of NO139304B publication Critical patent/NO139304B/no
Publication of NO139304C publication Critical patent/NO139304C/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
    • H04Q1/46—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Filters And Equalizers (AREA)
  • Circuits Of Receivers In General (AREA)
  • Selective Calling Equipment (AREA)
  • Mobile Radio Communication Systems (AREA)
NO763369A 1975-10-03 1976-10-01 Anordning for detektering av et tonesignal hvis frekvens ligger innenfor et visst tonefrekvensbaand NO139304C (no)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7511126A SE388100B (sv) 1975-10-03 1975-10-03 Anordning for detektering av en tonsignal med bestemd frekvens

Publications (3)

Publication Number Publication Date
NO763369L NO763369L (it) 1977-04-05
NO139304B NO139304B (no) 1978-10-30
NO139304C true NO139304C (no) 1979-02-14

Family

ID=20325715

Family Applications (1)

Application Number Title Priority Date Filing Date
NO763369A NO139304C (no) 1975-10-03 1976-10-01 Anordning for detektering av et tonesignal hvis frekvens ligger innenfor et visst tonefrekvensbaand

Country Status (9)

Country Link
US (1) US4092499A (it)
BR (1) BR7606595A (it)
DE (1) DE2643646C2 (it)
DK (1) DK145170C (it)
ES (1) ES452073A1 (it)
FI (1) FI762705A (it)
IT (1) IT1072517B (it)
NO (1) NO139304C (it)
SE (1) SE388100B (it)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4169969A (en) * 1974-11-21 1979-10-02 Societe Lignes Telegraphiques Et Telephoniques Apparatus for detecting in-band signalling signals
JPS605658A (ja) * 1983-06-07 1985-01-12 Hashimoto Corp 秘書電話方式
JP2598913Y2 (ja) * 1992-07-27 1999-08-23 ミツミ電機株式会社 データスライサ
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

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1487973B2 (de) * 1966-05-12 1970-10-08 Standard Elektrik Lorenz Ag, 7000 Stuttgart Schaltungsanordnung für einen sprachgeschützten Ein- oder Mehrfrequenz-Signalempfänger
DE1537338B2 (de) * 1967-07-21 1974-11-14 Siemens Ag, 1000 Berlin Und 8000 Muenchen Verfahren zur empfangsseitigen Fehlererkennung bei der Datenübertragung und Schaltungsanordnung zur Durchführung des Verfahrens
FR2141502B1 (it) * 1971-06-01 1973-06-29 Ibm France

Also Published As

Publication number Publication date
FI762705A (it) 1977-04-04
SE388100B (sv) 1976-09-20
DK145170C (da) 1983-02-21
DK444876A (da) 1977-04-04
BR7606595A (pt) 1977-07-05
DE2643646C2 (de) 1986-06-26
IT1072517B (it) 1985-04-10
DE2643646A1 (de) 1977-04-14
ES452073A1 (es) 1977-10-01
NO763369L (it) 1977-04-05
DK145170B (da) 1982-09-20
NO139304B (no) 1978-10-30
US4092499A (en) 1978-05-30

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