BR7708213A - Dispositivo de filtragem de um sinal eletrico - Google Patents

Dispositivo de filtragem de um sinal eletrico

Info

Publication number
BR7708213A
BR7708213A BR7708213A BR7708213A BR7708213A BR 7708213 A BR7708213 A BR 7708213A BR 7708213 A BR7708213 A BR 7708213A BR 7708213 A BR7708213 A BR 7708213A BR 7708213 A BR7708213 A BR 7708213A
Authority
BR
Brazil
Prior art keywords
electric signal
filtering device
signal filtering
electric
signal
Prior art date
Application number
BR7708213A
Other languages
English (en)
Inventor
P Regent
C Boulanger
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 BR7708213A publication Critical patent/BR7708213A/pt

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)
BR7708213A 1976-12-10 1977-12-09 Dispositivo de filtragem de um sinal eletrico BR7708213A (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7637276A FR2373934A1 (fr) 1976-12-10 1976-12-10 Dispositif de filtrage pour la detection de plusieurs frequences

Publications (1)

Publication Number Publication Date
BR7708213A true BR7708213A (pt) 1978-09-05

Family

ID=9180912

Family Applications (1)

Application Number Title Priority Date Filing Date
BR7708213A BR7708213A (pt) 1976-12-10 1977-12-09 Dispositivo de filtragem de um sinal eletrico

Country Status (9)

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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3831047A1 (de) * 1988-09-12 1990-03-22 Nixdorf Computer Ag Schaltungsanordnung zum frequenzselektiven erkennen von tonsignalen

Also Published As

Publication number Publication date
SE7714018L (sv) 1978-06-11
LU78661A1 (pt) 1978-07-12
IT1088733B (it) 1985-06-10
NL7713443A (nl) 1978-06-13
FR2373934A1 (fr) 1978-07-07
BE861001A (fr) 1978-05-22
DE2754026A1 (de) 1978-06-15
PL202703A1 (pl) 1978-08-28

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