PL202703A1 - ELECTRICAL SIGNAL FILTERING DEVICE FOR SEVERAL FREQUENCY DETECTION - Google Patents

ELECTRICAL SIGNAL FILTERING DEVICE FOR SEVERAL FREQUENCY DETECTION

Info

Publication number
PL202703A1
PL202703A1 PL20270377A PL20270377A PL202703A1 PL 202703 A1 PL202703 A1 PL 202703A1 PL 20270377 A PL20270377 A PL 20270377A PL 20270377 A PL20270377 A PL 20270377A PL 202703 A1 PL202703 A1 PL 202703A1
Authority
PL
Poland
Prior art keywords
electrical signal
filtering device
frequency detection
signal filtering
several frequency
Prior art date
Application number
PL20270377A
Other languages
Polish (pl)
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
Publication of PL202703A1 publication Critical patent/PL202703A1/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)
PL20270377A 1976-12-10 1977-12-07 ELECTRICAL SIGNAL FILTERING DEVICE FOR SEVERAL FREQUENCY DETECTION PL202703A1 (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
PL202703A1 true PL202703A1 (en) 1978-08-28

Family

ID=9180912

Family Applications (1)

Application Number Title Priority Date Filing Date
PL20270377A PL202703A1 (en) 1976-12-10 1977-12-07 ELECTRICAL SIGNAL FILTERING DEVICE FOR SEVERAL FREQUENCY DETECTION

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
DE2754026A1 (en) 1978-06-15
BE861001A (en) 1978-05-22
LU78661A1 (en) 1978-07-12
SE7714018L (en) 1978-06-11
BR7708213A (en) 1978-09-05
IT1088733B (en) 1985-06-10
FR2373934A1 (en) 1978-07-07
NL7713443A (en) 1978-06-13

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