FR830249A - Circuits sélecteurs de fréquence - Google Patents

Circuits sélecteurs de fréquence

Info

Publication number
FR830249A
FR830249A FR830249DA FR830249A FR 830249 A FR830249 A FR 830249A FR 830249D A FR830249D A FR 830249DA FR 830249 A FR830249 A FR 830249A
Authority
FR
France
Prior art keywords
frequency selector
selector circuits
circuits
frequency
selector
Prior art date
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
Other languages
English (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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR830249A publication Critical patent/FR830249A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/14—Arrangements providing for calling or supervisory signals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/04—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having negative temperature coefficient
    • 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
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
    • H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephonic Communication Services (AREA)
FR830249D 1936-12-02 1937-12-01 Circuits sélecteurs de fréquence Expired FR830249A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US113820A US2117843A (en) 1936-12-02 1936-12-02 Frequency selective circuits

Publications (1)

Publication Number Publication Date
FR830249A true FR830249A (fr) 1938-07-25

Family

ID=22351700

Family Applications (1)

Application Number Title Priority Date Filing Date
FR830249D Expired FR830249A (fr) 1936-12-02 1937-12-01 Circuits sélecteurs de fréquence

Country Status (5)

Country Link
US (1) US2117843A (fr)
BE (1) BE424937A (fr)
CH (1) CH211212A (fr)
FR (1) FR830249A (fr)
NL (1) NL49979C (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2694163A (en) * 1951-03-16 1954-11-09 Joseph G Sola Voltage sensitive apparatus
US2801290A (en) * 1951-09-17 1957-07-30 Telefunken Gmbh Calling signal responder arrangements

Also Published As

Publication number Publication date
US2117843A (en) 1938-05-17
BE424937A (fr)
CH211212A (de) 1940-08-31
NL49979C (fr)

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