NL7713443A - FILTER CHAIN FOR DETECTING SOME FREQUENCIES. - Google Patents

FILTER CHAIN FOR DETECTING SOME FREQUENCIES.

Info

Publication number
NL7713443A
NL7713443A NL7713443A NL7713443A NL7713443A NL 7713443 A NL7713443 A NL 7713443A NL 7713443 A NL7713443 A NL 7713443A NL 7713443 A NL7713443 A NL 7713443A NL 7713443 A NL7713443 A NL 7713443A
Authority
NL
Netherlands
Prior art keywords
frequencies
detecting
filter chain
chain
filter
Prior art date
Application number
NL7713443A
Other languages
Dutch (nl)
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 NL7713443A publication Critical patent/NL7713443A/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)
NL7713443A 1976-12-10 1977-12-05 FILTER CHAIN FOR DETECTING SOME FREQUENCIES. NL7713443A (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
NL7713443A true NL7713443A (en) 1978-06-13

Family

ID=9180912

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7713443A NL7713443A (en) 1976-12-10 1977-12-05 FILTER CHAIN FOR DETECTING SOME 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
DE2754026A1 (en) 1978-06-15
LU78661A1 (en) 1978-07-12
BE861001A (en) 1978-05-22
PL202703A1 (en) 1978-08-28
FR2373934A1 (en) 1978-07-07
BR7708213A (en) 1978-09-05
SE7714018L (en) 1978-06-11
IT1088733B (en) 1985-06-10

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Legal Events

Date Code Title Description
BV The patent application has lapsed