IT1088733B - FILTERING DEVICE FOR THE DETECTION OF MORE FREQUENCIES - Google Patents

FILTERING DEVICE FOR THE DETECTION OF MORE FREQUENCIES

Info

Publication number
IT1088733B
IT1088733B IT30300/77A IT3030077A IT1088733B IT 1088733 B IT1088733 B IT 1088733B IT 30300/77 A IT30300/77 A IT 30300/77A IT 3030077 A IT3030077 A IT 3030077A IT 1088733 B IT1088733 B IT 1088733B
Authority
IT
Italy
Prior art keywords
frequencies
detection
filtering device
filtering
Prior art date
Application number
IT30300/77A
Other languages
Italian (it)
Original Assignee
Cit Alcatel
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 Cit Alcatel filed Critical Cit Alcatel
Application granted granted Critical
Publication of IT1088733B publication Critical patent/IT1088733B/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
    • H04Q1/453—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)
  • Networks Using Active Elements (AREA)
IT30300/77A 1976-12-10 1977-12-02 FILTERING DEVICE FOR THE DETECTION OF MORE FREQUENCIES IT1088733B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7637276A FR2373934A1 (en) 1976-12-10 1976-12-10 Telephone system tuned filter circuit - has several tuned sections each preceded by operational amplifier receiving output of adjacent section

Publications (1)

Publication Number Publication Date
IT1088733B true IT1088733B (en) 1985-06-10

Family

ID=9180912

Family Applications (1)

Application Number Title Priority Date Filing Date
IT30300/77A IT1088733B (en) 1976-12-10 1977-12-02 FILTERING DEVICE FOR THE DETECTION OF MORE FREQUENCIES

Country Status (9)

Country Link
BE (1) BE861001A (en)
BR (1) BR7708213A (en)
DE (1) DE2754026A1 (en)
FR (1) FR2373934A1 (en)
IT (1) IT1088733B (en)
LU (1) LU78661A1 (en)
NL (1) NL7713443A (en)
PL (1) PL202703A1 (en)
SE (1) SE7714018L (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3831047A1 (en) * 1988-09-12 1990-03-22 Nixdorf Computer Ag CIRCUIT ARRANGEMENT FOR FREQUENCY SELECTIVE DETECTION OF SOUND SIGNALS

Also Published As

Publication number Publication date
NL7713443A (en) 1978-06-13
PL202703A1 (en) 1978-08-28
FR2373934A1 (en) 1978-07-07
SE7714018L (en) 1978-06-11
BE861001A (en) 1978-05-22
DE2754026A1 (en) 1978-06-15
LU78661A1 (en) 1978-07-12
BR7708213A (en) 1978-09-05

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