BR7803730A - Dispositivo para o reconhecimento de uma frequencia - Google Patents

Dispositivo para o reconhecimento de uma frequencia

Info

Publication number
BR7803730A
BR7803730A BR787803730A BR7803730A BR7803730A BR 7803730 A BR7803730 A BR 7803730A BR 787803730 A BR787803730 A BR 787803730A BR 7803730 A BR7803730 A BR 7803730A BR 7803730 A BR7803730 A BR 7803730A
Authority
BR
Brazil
Prior art keywords
recognition
frequency
Prior art date
Application number
BR787803730A
Other languages
English (en)
Inventor
J Luder
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 BR7803730A publication Critical patent/BR7803730A/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
    • H04Q1/446—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)
  • Bidirectional Digital Transmission (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
  • Telephonic Communication Services (AREA)
  • Manipulation Of Pulses (AREA)
BR787803730A 1977-06-10 1978-06-09 Dispositivo para o reconhecimento de uma frequencia BR7803730A (pt)

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
BR7803730A true BR7803730A (pt) 1979-02-20

Family

ID=9191938

Family Applications (1)

Application Number Title Priority Date Filing Date
BR787803730A BR7803730A (pt) 1977-06-10 1978-06-09 Dispositivo para o reconhecimento de uma frequencia

Country Status (14)

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

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 (pt) * 1973-08-08 1976-11-12 Cit Alcatel

Also Published As

Publication number Publication date
US4194092A (en) 1980-03-18
GB2000345B (en) 1982-01-06
IT7823972A0 (it) 1978-05-30
SE7806681L (sv) 1978-12-11
DK259178A (da) 1978-12-11
FR2394213A1 (fr) 1979-01-05
IE46855B1 (en) 1983-10-05
CA1111588A (fr) 1981-10-27
NL7806252A (nl) 1978-12-12
DE2824565A1 (de) 1978-12-21
SE418136B (sv) 1981-05-04
FR2394213B1 (pt) 1980-01-04
LU79790A1 (fr) 1979-02-02
GB2000345A (en) 1979-01-04
BE867445A (fr) 1978-11-27
IE781170L (en) 1978-12-10
JPS6224980B2 (pt) 1987-06-01
IT1094884B (it) 1985-08-10
JPS545321A (en) 1979-01-16
DE2824565C2 (pt) 1987-07-23

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