FR2268406B1 - - Google Patents

Info

Publication number
FR2268406B1
FR2268406B1 FR7413137A FR7413137A FR2268406B1 FR 2268406 B1 FR2268406 B1 FR 2268406B1 FR 7413137 A FR7413137 A FR 7413137A FR 7413137 A FR7413137 A FR 7413137A FR 2268406 B1 FR2268406 B1 FR 2268406B1
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
FR7413137A
Other languages
French (fr)
Other versions
FR2268406A1 (en
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 FR7413137A priority Critical patent/FR2268406A1/fr
Publication of FR2268406A1 publication Critical patent/FR2268406A1/fr
Application granted granted Critical
Publication of FR2268406B1 publication Critical patent/FR2268406B1/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
    • H04Q1/46—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)
  • Devices For Supply Of Signal Current (AREA)
FR7413137A 1974-04-16 1974-04-16 Double frequency telephone signalling - recognises signal for set frequency voltage relationship Granted FR2268406A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7413137A FR2268406A1 (en) 1974-04-16 1974-04-16 Double frequency telephone signalling - recognises signal for set frequency voltage relationship

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7413137A FR2268406A1 (en) 1974-04-16 1974-04-16 Double frequency telephone signalling - recognises signal for set frequency voltage relationship

Publications (2)

Publication Number Publication Date
FR2268406A1 FR2268406A1 (en) 1975-11-14
FR2268406B1 true FR2268406B1 (ru) 1976-12-17

Family

ID=9137657

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7413137A Granted FR2268406A1 (en) 1974-04-16 1974-04-16 Double frequency telephone signalling - recognises signal for set frequency voltage relationship

Country Status (1)

Country Link
FR (1) FR2268406A1 (ru)

Also Published As

Publication number Publication date
FR2268406A1 (en) 1975-11-14

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Legal Events

Date Code Title Description
ST Notification of lapse