JPS532004B1 - - Google Patents

Info

Publication number
JPS532004B1
JPS532004B1 JP3458072A JP3458072A JPS532004B1 JP S532004 B1 JPS532004 B1 JP S532004B1 JP 3458072 A JP3458072 A JP 3458072A JP 3458072 A JP3458072 A JP 3458072A JP S532004 B1 JPS532004 B1 JP S532004B1
Authority
JP
Japan
Legal status (The legal status 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 status listed.)
Pending
Application number
JP3458072A
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 filed Critical
Publication of JPS532004B1 publication Critical patent/JPS532004B1/ja
Pending legal-status Critical Current

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
    • H04Q1/46—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Interface Circuits In Exchanges (AREA)
JP3458072A 1971-06-01 1972-04-07 Pending JPS532004B1 (ja)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR717120613A FR2141502B1 (ja) 1971-06-01 1971-06-01

Publications (1)

Publication Number Publication Date
JPS532004B1 true JPS532004B1 (ja) 1978-01-24

Family

ID=9078249

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3458072A Pending JPS532004B1 (ja) 1971-06-01 1972-04-07

Country Status (7)

Country Link
US (1) US3770900A (ja)
JP (1) JPS532004B1 (ja)
CA (1) CA961184A (ja)
DE (1) DE2221368C3 (ja)
FR (1) FR2141502B1 (ja)
GB (1) GB1348103A (ja)
IT (1) IT950710B (ja)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT330252B (de) * 1972-09-28 1976-06-25 Siemens Ag Sprachgeschutzer frequenzselektiver zeichenempfanger fur fernmelde-, insbesondere fernsprechanlagen
US3916115A (en) * 1974-03-04 1975-10-28 Gte Automatic Electric Lab Inc Multifrequency signal parity detector
US3917913A (en) * 1974-06-03 1975-11-04 Ibm Telephone calling signal translating circuitry
DE2432455C2 (de) * 1974-07-06 1982-02-18 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Auswerter für sprachgeschützte frequenzselektive Zeichenempfänger
JPS5136005A (ja) * 1974-09-20 1976-03-26 Meisei Electric Co Ltd
SE388100B (sv) * 1975-10-03 1976-09-20 Ericsson Telefon Ab L M Anordning for detektering av en tonsignal med bestemd frekvens
NL7903346A (nl) * 1979-04-27 1980-10-29 Bell Telephone Mfg Digitaal signaleringsstelsel.
DE3115151A1 (de) * 1981-04-15 1982-11-11 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schaltungsanordnung zur auswertung von aus mehreren gleichzeitig uebertragenen wechselstroemen unterschiedlicher signalfrequenzen gebildeten wechselstromsignalen, in fernmeldeanlagen
DD259987A3 (de) * 1986-07-07 1988-09-14 Rft Nachrichtenelektronik Albe Verfahren und anordnung zum sprachschutz in mfc-tastwahlempfaengern
DE3710695A1 (de) * 1987-03-31 1988-10-20 Nixdorf Computer Ag Schaltungsanordnung zum erkennen von doppelton-mehrfrequenzsignalen in fernsprechanlagen
US5408529A (en) * 1993-06-02 1995-04-18 Motorola, Inc. Dual tone detector operable in the presence of speech or background noise and method therefor
US6692234B2 (en) * 1999-03-22 2004-02-17 Water Management Systems Pump system with vacuum source
BE1019445A3 (fr) * 2010-08-11 2012-07-03 Reza Yves Procede d'extraction d'information audio.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3140357A (en) * 1962-06-28 1964-07-07 Bell Telephone Labor Inc Multifrequency receiver
US3319011A (en) * 1964-05-11 1967-05-09 Bell Telephone Labor Inc Multifrequency signal receiver circuit
NL6805157A (ja) * 1968-04-10 1969-10-14
GB1226368A (ja) * 1968-08-15 1971-03-24
US3710031A (en) * 1970-12-23 1973-01-09 Itt Multi frequency receiver

Also Published As

Publication number Publication date
FR2141502B1 (ja) 1973-06-29
IT950710B (it) 1973-06-20
GB1348103A (en) 1974-03-13
FR2141502A1 (ja) 1973-01-26
DE2221368C3 (de) 1979-07-26
DE2221368A1 (de) 1972-12-14
US3770900A (en) 1973-11-06
CA961184A (en) 1975-01-14
DE2221368B2 (de) 1976-11-04

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