BE867445A - Dispositif pour la reconnaissance d'une frequence dans un signal code en mic - Google Patents

Dispositif pour la reconnaissance d'une frequence dans un signal code en mic

Info

Publication number
BE867445A
BE867445A BE1008898A BE1008898A BE867445A BE 867445 A BE867445 A BE 867445A BE 1008898 A BE1008898 A BE 1008898A BE 1008898 A BE1008898 A BE 1008898A BE 867445 A BE867445 A BE 867445A
Authority
BE
Belgium
Prior art keywords
recognizing
frequency
code signal
mic code
mic
Prior art date
Application number
BE1008898A
Other languages
English (en)
French (fr)
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 BE867445A publication Critical patent/BE867445A/xx

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
    • H04Q1/448—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency with conversion of a single frequency signal into a digital signal
    • H04Q1/4485—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency with conversion of a single frequency signal into a digital signal which is transmitted in digital form

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Bidirectional Digital Transmission (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Telephonic Communication Services (AREA)
  • Manipulation Of Pulses (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
BE1008898A 1977-06-10 1978-05-25 Dispositif pour la reconnaissance d'une frequence dans un signal code en mic BE867445A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7717814A FR2394213A1 (fr) 1977-06-10 1977-06-10 Dispositif pour la reconnaissance d'une frequence dans un signal code en mic

Publications (1)

Publication Number Publication Date
BE867445A true BE867445A (fr) 1978-11-27

Family

ID=9191938

Family Applications (1)

Application Number Title Priority Date Filing Date
BE1008898A BE867445A (fr) 1977-06-10 1978-05-25 Dispositif pour la reconnaissance d'une frequence dans un signal code en mic

Country Status (14)

Country Link
US (1) US4194092A (xx)
JP (1) JPS545321A (xx)
BE (1) BE867445A (xx)
BR (1) BR7803730A (xx)
CA (1) CA1111588A (xx)
DE (1) DE2824565A1 (xx)
DK (1) DK259178A (xx)
FR (1) FR2394213A1 (xx)
GB (1) GB2000345B (xx)
IE (1) IE46855B1 (xx)
IT (1) IT1094884B (xx)
LU (1) LU79790A1 (xx)
NL (1) NL7806252A (xx)
SE (1) SE418136B (xx)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS558120A (en) * 1978-06-30 1980-01-21 Nec Corp Tone detection device
US4352962A (en) * 1980-06-27 1982-10-05 Reliance Electric Company Tone responsive disabling circuit
CA1137632A (en) * 1980-09-25 1982-12-14 Claude J.J. Champagne Pulse code demodulator for frequency shift keyed data
JPS60121856A (ja) * 1983-12-06 1985-06-29 Nec Corp 単一周波数信号検出回路
JPS6292553A (ja) * 1985-10-18 1987-04-28 Kokusai Denshin Denwa Co Ltd <Kdd> デイジタル伝送路の監視制御方式
US4881221A (en) * 1988-06-23 1989-11-14 Kentrox Industries, Inc. Method and apparatus for disabling an echo canceller on a digital telecommunications network
DE4119963A1 (de) * 1991-06-18 1992-12-24 Philips Patentverwaltung Echokompensator
US5404807A (en) * 1992-06-09 1995-04-11 Riso Kagaku Corporation Three dimensional image formation process

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3624520A (en) * 1970-01-05 1971-11-30 Frank A Perkins Jr Wide band digital phase detector
US3647993A (en) * 1970-05-18 1972-03-07 Wescom Tone disabler
US3783194A (en) * 1972-11-20 1974-01-01 Milgo Electronic Corp Data modem having a fast turn-around time over direct distance dialed networks
FR2240583B1 (xx) * 1973-08-08 1976-11-12 Cit Alcatel

Also Published As

Publication number Publication date
NL7806252A (nl) 1978-12-12
LU79790A1 (fr) 1979-02-02
JPS6224980B2 (xx) 1987-06-01
DK259178A (da) 1978-12-11
GB2000345B (en) 1982-01-06
BR7803730A (pt) 1979-02-20
FR2394213B1 (xx) 1980-01-04
US4194092A (en) 1980-03-18
SE418136B (sv) 1981-05-04
IT1094884B (it) 1985-08-10
FR2394213A1 (fr) 1979-01-05
IT7823972A0 (it) 1978-05-30
DE2824565A1 (de) 1978-12-21
DE2824565C2 (xx) 1987-07-23
GB2000345A (en) 1979-01-04
JPS545321A (en) 1979-01-16
SE7806681L (sv) 1978-12-11
CA1111588A (fr) 1981-10-27
IE46855B1 (en) 1983-10-05
IE781170L (en) 1978-12-10

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Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: CIE INDUSTRIELLE DES TELECOMMUNICATIONS CIT-ALCAT

Effective date: 19940531