IT1117427B - Procedimento per un sicuro riscontro di segnali sinusoidali di frequenza acustica - Google Patents

Procedimento per un sicuro riscontro di segnali sinusoidali di frequenza acustica

Info

Publication number
IT1117427B
IT1117427B IT4991279A IT4991279A IT1117427B IT 1117427 B IT1117427 B IT 1117427B IT 4991279 A IT4991279 A IT 4991279A IT 4991279 A IT4991279 A IT 4991279A IT 1117427 B IT1117427 B IT 1117427B
Authority
IT
Italy
Prior art keywords
signal
signal level
recognition system
level detection
acoustic signals
Prior art date
Application number
IT4991279A
Other languages
English (en)
Other versions
IT7949912A0 (it
Original Assignee
Telefonbau & Normalzeit Gmbh
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 Telefonbau & Normalzeit Gmbh filed Critical Telefonbau & Normalzeit Gmbh
Publication of IT7949912A0 publication Critical patent/IT7949912A0/it
Application granted granted Critical
Publication of IT1117427B publication Critical patent/IT1117427B/it

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Semiconductor Integrated Circuits (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Machine Translation (AREA)
IT4991279A 1978-08-05 1979-07-31 Procedimento per un sicuro riscontro di segnali sinusoidali di frequenza acustica IT1117427B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2834405 1978-08-05

Publications (2)

Publication Number Publication Date
IT7949912A0 IT7949912A0 (it) 1979-07-31
IT1117427B true IT1117427B (it) 1986-02-17

Family

ID=6046323

Family Applications (1)

Application Number Title Priority Date Filing Date
IT4991279A IT1117427B (it) 1978-08-05 1979-07-31 Procedimento per un sicuro riscontro di segnali sinusoidali di frequenza acustica

Country Status (4)

Country Link
AT (1) AT370578B (it)
BE (1) BE878073A (it)
ES (1) ES483114A1 (it)
IT (1) IT1117427B (it)

Also Published As

Publication number Publication date
AT370578B (de) 1983-04-11
ES483114A1 (es) 1980-04-16
ATA759178A (de) 1982-08-15
BE878073A (fr) 1979-12-03
IT7949912A0 (it) 1979-07-31

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