IT950710B - Ricevitore perfezionato particolar mente per impianti telefonici - Google Patents

Ricevitore perfezionato particolar mente per impianti telefonici

Info

Publication number
IT950710B
IT950710B IT22322/72A IT2232272A IT950710B IT 950710 B IT950710 B IT 950710B IT 22322/72 A IT22322/72 A IT 22322/72A IT 2232272 A IT2232272 A IT 2232272A IT 950710 B IT950710 B IT 950710B
Authority
IT
Italy
Prior art keywords
telephone systems
special receiver
receiver
special
telephone
Prior art date
Application number
IT22322/72A
Other languages
English (en)
Original Assignee
Ibm
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 Ibm filed Critical Ibm
Application granted granted Critical
Publication of IT950710B publication Critical patent/IT950710B/it

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)
IT22322/72A 1971-06-01 1972-03-24 Ricevitore perfezionato particolar mente per impianti telefonici IT950710B (it)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
IT950710B true IT950710B (it) 1973-06-20

Family

ID=9078249

Family Applications (1)

Application Number Title Priority Date Filing Date
IT22322/72A IT950710B (it) 1971-06-01 1972-03-24 Ricevitore perfezionato particolar mente per impianti telefonici

Country Status (7)

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

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 (it) * 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 (it) * 1968-04-10 1969-10-14
GB1226368A (it) * 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
DE2221368A1 (de) 1972-12-14
JPS532004B1 (it) 1978-01-24
GB1348103A (en) 1974-03-13
FR2141502B1 (it) 1973-06-29
DE2221368C3 (de) 1979-07-26
FR2141502A1 (it) 1973-01-26
CA961184A (en) 1975-01-14
US3770900A (en) 1973-11-06
DE2221368B2 (de) 1976-11-04

Similar Documents

Publication Publication Date Title
BE787527A (fr) Systeme de telecommunications par satellite
BE791760A (fr) Systeme de repondeur telephonique
ZA703087B (en) P.c.m.telephone system
IT971136B (it) Sistema di comunicazione perfe zionato
ZA739636B (en) Guttering systems
NL7312704A (nl) Bewakingsstelsel.
NL173466C (nl) Fm-ontvanger.
IT950710B (it) Ricevitore perfezionato particolar mente per impianti telefonici
BE777931A (fr) Systeme de communication
IT943310B (it) Complesso di segnalazione per siste mi telefonici a tastiera
NL145682B (nl) Secundair radarstelsel.
CH534458A (de) Nachrichtenübertragungsanlage
AT310815B (de) Funktelephoniesystem
BE775249A (fr) Systeme de communication
NL164435C (nl) Ontvanginrichting.
AT333354B (de) Bildfernsprechsystem
BE787524A (fr) Systeme de telecommunication par satellite
NL161320C (nl) Kanaalkiesstelsel.
NL169254C (nl) Televisieontvanger.
IT970156B (it) Disposizione circuitale per la soppressione di disturbi per un ricevitore radar
IL37987A0 (en) Telecommunications systems
IT964389B (it) Impianto di segnalazione
TR17298A (tr) Katalizatoer sistemleri
IT980245B (it) Sistema di segnalazione telefonica
IL40552A (en) Telecommunications systems