NL7600113A - Toonfrequente detectie-inrichting. - Google Patents

Toonfrequente detectie-inrichting.

Info

Publication number
NL7600113A
NL7600113A NL7600113A NL7600113A NL7600113A NL 7600113 A NL7600113 A NL 7600113A NL 7600113 A NL7600113 A NL 7600113A NL 7600113 A NL7600113 A NL 7600113A NL 7600113 A NL7600113 A NL 7600113A
Authority
NL
Netherlands
Prior art keywords
tone
detection device
frequent detection
frequent
detection
Prior art date
Application number
NL7600113A
Other languages
English (en)
Original Assignee
Western Electric Co
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 Western Electric Co filed Critical Western Electric Co
Publication of NL7600113A publication Critical patent/NL7600113A/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
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
    • H04Q1/448—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency with conversion of a single frequency signal into a digital signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Mobile Radio Communication Systems (AREA)
NL7600113A 1975-01-08 1976-01-07 Toonfrequente detectie-inrichting. NL7600113A (nl)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/539,414 US3990006A (en) 1975-01-08 1975-01-08 Digital tone detector using concatenated detection intervals

Publications (1)

Publication Number Publication Date
NL7600113A true NL7600113A (nl) 1976-07-12

Family

ID=24151113

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7600113A NL7600113A (nl) 1975-01-08 1976-01-07 Toonfrequente detectie-inrichting.

Country Status (9)

Country Link
US (1) US3990006A (nl)
JP (1) JPS5193612A (nl)
BE (1) BE837302A (nl)
CA (1) CA1047611A (nl)
DE (1) DE2600361A1 (nl)
FR (1) FR2297519A1 (nl)
GB (1) GB1529083A (nl)
IT (1) IT1055748B (nl)
NL (1) NL7600113A (nl)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4162448A (en) * 1977-03-16 1979-07-24 Lewis Security Systems Limited Radio signalling systems
US4193393A (en) * 1977-08-25 1980-03-18 International Bio-Medical Industries Diagnostic apparatus
CH635695A5 (de) * 1978-08-31 1983-04-15 Landis & Gyr Ag Detektor zur feststellung der anwesenheit mindestens eines elektrischen signals mit einer vorbestimmten charakteristik.
US4215308A (en) * 1978-10-30 1980-07-29 Hewlett-Packard Company Self calibrating crystal controlled frequency counter method and apparatus
GB2149616B (en) * 1983-11-10 1987-10-07 Standard Telephones Cables Ltd Testing telephone lines
SE9202065L (sv) * 1992-07-03 1994-01-04 Ericsson Telefon Ab L M Sätt att förbättra mottagarens känslighet och talimmuniteten vid DTMF-mottagning
US20060222106A1 (en) * 2005-04-04 2006-10-05 Seidman James L Method for detecting single frequency tones

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3083266A (en) * 1961-02-28 1963-03-26 Bell Telephone Labor Inc Vocoder apparatus
US3566263A (en) * 1968-05-07 1971-02-23 Benjamin Z Meers Jr Digital notch filter
DE1950684C3 (de) * 1969-10-08 1975-04-30 Wandel U. Goltermann, 7410 Reutlingen Schaltungsanordnung für den Vergleich zweier Frequenzen
US3760269A (en) * 1972-07-31 1973-09-18 Gte Automatic Electric Lab Inc Multi-frequency tone detector
US3790720A (en) * 1972-10-27 1974-02-05 Northern Electric Co Digital decoder for multiple frequency telephone signalling

Also Published As

Publication number Publication date
FR2297519B1 (nl) 1980-10-10
CA1047611A (en) 1979-01-30
JPS5193612A (nl) 1976-08-17
IT1055748B (it) 1982-01-11
GB1529083A (en) 1978-10-18
US3990006A (en) 1976-11-02
BE837302A (fr) 1976-05-03
DE2600361A1 (de) 1976-07-22
FR2297519A1 (fr) 1976-08-06

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Legal Events

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BV The patent application has lapsed