BE841907R - SIGNAL FREQUENCY RECOGNITION CIRCUIT - Google Patents

SIGNAL FREQUENCY RECOGNITION CIRCUIT

Info

Publication number
BE841907R
BE841907R BE2055033A BE2055033A BE841907R BE 841907 R BE841907 R BE 841907R BE 2055033 A BE2055033 A BE 2055033A BE 2055033 A BE2055033 A BE 2055033A BE 841907 R BE841907 R BE 841907R
Authority
BE
Belgium
Prior art keywords
signal frequency
recognition circuit
frequency recognition
circuit
signal
Prior art date
Application number
BE2055033A
Other languages
French (fr)
Inventor
L Gasser
D Illi
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 filed Critical
Application granted granted Critical
Publication of BE841907R publication Critical patent/BE841907R/en

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
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)
BE2055033A 1975-05-16 1976-05-17 SIGNAL FREQUENCY RECOGNITION CIRCUIT BE841907R (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19752521983 DE2521983A1 (en) 1975-05-16 1975-05-16 FREQUENCY SELECTIVE SIGNAL RECEIVER

Publications (1)

Publication Number Publication Date
BE841907R true BE841907R (en) 1976-11-17

Family

ID=5946782

Family Applications (1)

Application Number Title Priority Date Filing Date
BE2055033A BE841907R (en) 1975-05-16 1976-05-17 SIGNAL FREQUENCY RECOGNITION CIRCUIT

Country Status (5)

Country Link
AU (1) AU1398676A (en)
BE (1) BE841907R (en)
DE (1) DE2521983A1 (en)
FR (1) FR2311460A1 (en)
GB (1) GB1529506A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0566928A3 (en) * 1992-04-24 1994-08-10 Alcatel Australia Tone detection method for telephone subset
AU663370B2 (en) * 1992-04-24 1995-10-05 Alcatel Australia Limited Tone detection method for telephone subset
CN109525356B (en) * 2018-09-28 2024-01-09 成都大公博创信息技术有限公司 Management and control method for cheating radio signals in strong-immunity examination

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2422840A1 (en) * 1974-05-10 1975-12-11 Standard Elektrik Lorenz Ag FREQUENCY SELECTIVE SIGNAL RECEIVER

Also Published As

Publication number Publication date
GB1529506A (en) 1978-10-25
DE2521983A1 (en) 1976-11-25
AU1398676A (en) 1977-11-24
FR2311460A1 (en) 1976-12-10

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