FR2191827A5 - - Google Patents

Info

Publication number
FR2191827A5
FR2191827A5 FR7223909A FR7223909A FR2191827A5 FR 2191827 A5 FR2191827 A5 FR 2191827A5 FR 7223909 A FR7223909 A FR 7223909A FR 7223909 A FR7223909 A FR 7223909A FR 2191827 A5 FR2191827 A5 FR 2191827A5
Authority
FR
France
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.)
Expired
Application number
FR7223909A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SOCOTEL MIXTE D VELOPPEM
Original Assignee
SOCOTEL MIXTE D VELOPPEM
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 SOCOTEL MIXTE D VELOPPEM filed Critical SOCOTEL MIXTE D VELOPPEM
Priority to FR7223909A priority Critical patent/FR2191827A5/fr
Priority to IT50457/73A priority patent/IT985932B/it
Priority to BE132025A priority patent/BE800626A/fr
Priority to GB2948173A priority patent/GB1436623A/en
Priority to SE7308900A priority patent/SE387033B/xx
Priority to CH932073A priority patent/CH578810A5/xx
Priority to US373759A priority patent/US3909549A/en
Priority to NL7308966A priority patent/NL7308966A/xx
Priority to DE2332696A priority patent/DE2332696A1/de
Application granted granted Critical
Publication of FR2191827A5 publication Critical patent/FR2191827A5/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback
    • H03H11/1295—Parallel-T filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback
    • H03H11/1217—Frequency selective two-port networks using amplifiers with feedback using a plurality of operational amplifiers
    • 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)
  • Amplifiers (AREA)
FR7223909A 1972-06-27 1972-06-27 Expired FR2191827A5 (fr)

Priority Applications (9)

Application Number Priority Date Filing Date Title
FR7223909A FR2191827A5 (fr) 1972-06-27 1972-06-27
IT50457/73A IT985932B (it) 1972-06-27 1973-06-06 Segnalatore a frequenza multipla e precisamente il suo ricevitore di segnalazione
BE132025A BE800626A (fr) 1972-06-27 1973-06-07 Signaleur multifrequence et notamment son recepteur de signalisation
GB2948173A GB1436623A (en) 1972-06-27 1973-06-21 Signalling receiver
SE7308900A SE387033B (sv) 1972-06-27 1973-06-25 Flerfrekvenssignaleringsmottagare innefattande ett flertal selektiva filter, av vilka vart och ett har reglerbar selektivitet
CH932073A CH578810A5 (fr) 1972-06-27 1973-06-26
US373759A US3909549A (en) 1972-06-27 1973-06-26 Multifrequency signalling device and particularly signalling receiver thereof
NL7308966A NL7308966A (fr) 1972-06-27 1973-06-27
DE2332696A DE2332696A1 (de) 1972-06-27 1973-06-27 Mehrfrequenz-signalgenerator, insbesondere mehrfrequenz-sender/empfaenger-einheit fuer den einsatz zwischen fernsprechzentralen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7223909A FR2191827A5 (fr) 1972-06-27 1972-06-27

Publications (1)

Publication Number Publication Date
FR2191827A5 true FR2191827A5 (fr) 1974-02-01

Family

ID=9101217

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7223909A Expired FR2191827A5 (fr) 1972-06-27 1972-06-27

Country Status (9)

Country Link
US (1) US3909549A (fr)
BE (1) BE800626A (fr)
CH (1) CH578810A5 (fr)
DE (1) DE2332696A1 (fr)
FR (1) FR2191827A5 (fr)
GB (1) GB1436623A (fr)
IT (1) IT985932B (fr)
NL (1) NL7308966A (fr)
SE (1) SE387033B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2280141A1 (fr) * 1974-07-26 1976-02-20 Materiel Telephonique Systeme de signalisation entre centres de traitement d'informations

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4313038A (en) * 1978-10-13 1982-01-26 Wescom, Inc. DTMF Signal receiver
NL7903346A (nl) * 1979-04-27 1980-10-29 Bell Telephone Mfg Digitaal signaleringsstelsel.
US4604755A (en) * 1984-06-01 1986-08-05 International Business Machines Corp. Feed forward dual channel automatic level control for dual tone multi-frequency receivers
US5107491A (en) * 1990-02-20 1992-04-21 Advanced Micro Devices, Inc. Collision filter

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3780230A (en) * 1972-11-10 1973-12-18 Bell Telephone Labor Inc Multifrequency tone receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2280141A1 (fr) * 1974-07-26 1976-02-20 Materiel Telephonique Systeme de signalisation entre centres de traitement d'informations

Also Published As

Publication number Publication date
IT985932B (it) 1974-12-30
NL7308966A (fr) 1974-01-02
CH578810A5 (fr) 1976-08-13
SE387033B (sv) 1976-08-23
GB1436623A (en) 1976-05-19
BE800626A (fr) 1973-10-01
DE2332696A1 (de) 1974-01-17
US3909549A (en) 1975-09-30

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Legal Events

Date Code Title Description
TP Transmission of property
ST Notification of lapse