FR2292235B1 - - Google Patents

Info

Publication number
FR2292235B1
FR2292235B1 FR7438236A FR7438236A FR2292235B1 FR 2292235 B1 FR2292235 B1 FR 2292235B1 FR 7438236 A FR7438236 A FR 7438236A FR 7438236 A FR7438236 A FR 7438236A FR 2292235 B1 FR2292235 B1 FR 2292235B1
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
FR7438236A
Other languages
French (fr)
Other versions
FR2292235A1 (fr
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.)
Lignes Telegraphiques et Telephoniques LTT SA
Original Assignee
Lignes Telegraphiques et Telephoniques LTT SA
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 Lignes Telegraphiques et Telephoniques LTT SA filed Critical Lignes Telegraphiques et Telephoniques LTT SA
Priority to FR7438236A priority Critical patent/FR2292235A1/fr
Priority to DE19752552290 priority patent/DE2552290C3/de
Publication of FR2292235A1 publication Critical patent/FR2292235A1/fr
Priority to US05/862,160 priority patent/US4169969A/en
Application granted granted Critical
Publication of FR2292235B1 publication Critical patent/FR2292235B1/fr
Granted 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
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/10—Measuring sum, difference or ratio
    • 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
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
    • H04Q1/4535—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted with an additional signal transmitted for voice protection

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Manipulation Of Pulses (AREA)
FR7438236A 1974-11-21 1974-11-21 Procede de determination du rapport des amplitudes de deux tensions sinusoidales utilisant un dispositif d'ecretage et circuits de mise en oeuvre Granted FR2292235A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR7438236A FR2292235A1 (fr) 1974-11-21 1974-11-21 Procede de determination du rapport des amplitudes de deux tensions sinusoidales utilisant un dispositif d'ecretage et circuits de mise en oeuvre
DE19752552290 DE2552290C3 (de) 1974-11-21 1975-11-21 Verfahren und Schaltungen zur Bestimmung des Verhältnisses der Amplituden von zwei sinusförmigen Spannungen
US05/862,160 US4169969A (en) 1974-11-21 1977-12-19 Apparatus for detecting in-band signalling signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7438236A FR2292235A1 (fr) 1974-11-21 1974-11-21 Procede de determination du rapport des amplitudes de deux tensions sinusoidales utilisant un dispositif d'ecretage et circuits de mise en oeuvre

Publications (2)

Publication Number Publication Date
FR2292235A1 FR2292235A1 (fr) 1976-06-18
FR2292235B1 true FR2292235B1 (de) 1980-03-14

Family

ID=9145115

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7438236A Granted FR2292235A1 (fr) 1974-11-21 1974-11-21 Procede de determination du rapport des amplitudes de deux tensions sinusoidales utilisant un dispositif d'ecretage et circuits de mise en oeuvre

Country Status (1)

Country Link
FR (1) FR2292235A1 (de)

Also Published As

Publication number Publication date
FR2292235A1 (fr) 1976-06-18

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Legal Events

Date Code Title Description
ST Notification of lapse