FR1134321A - Automatically controlled two-way amplifier, especially for telephone systems incorporating loudspeaker telephone apparatus, such as intercom systems, and for analogous systems - Google Patents

Automatically controlled two-way amplifier, especially for telephone systems incorporating loudspeaker telephone apparatus, such as intercom systems, and for analogous systems

Info

Publication number
FR1134321A
FR1134321A FR1134321DA FR1134321A FR 1134321 A FR1134321 A FR 1134321A FR 1134321D A FR1134321D A FR 1134321DA FR 1134321 A FR1134321 A FR 1134321A
Authority
FR
France
Prior art keywords
systems
telephone
automatically controlled
analogous
intercom
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
French (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.)
SVENSKA RELAFABRIKEN AB
Original Assignee
SVENSKA RELAFABRIKEN AB
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 SVENSKA RELAFABRIKEN AB filed Critical SVENSKA RELAFABRIKEN AB
Application granted granted Critical
Publication of FR1134321A publication Critical patent/FR1134321A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Control Of Amplification And Gain Control (AREA)
FR1134321D 1954-02-24 1955-02-22 Automatically controlled two-way amplifier, especially for telephone systems incorporating loudspeaker telephone apparatus, such as intercom systems, and for analogous systems Expired FR1134321A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE333371X 1954-02-24

Publications (1)

Publication Number Publication Date
FR1134321A true FR1134321A (en) 1957-04-10

Family

ID=20308163

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1134321D Expired FR1134321A (en) 1954-02-24 1955-02-22 Automatically controlled two-way amplifier, especially for telephone systems incorporating loudspeaker telephone apparatus, such as intercom systems, and for analogous systems

Country Status (6)

Country Link
BE (1) BE535941A (en)
CH (1) CH333371A (en)
DE (1) DE1049430B (en)
FR (1) FR1134321A (en)
GB (1) GB779172A (en)
NL (1) NL97209C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1160897B (en) * 1957-11-26 1964-01-09 Svenska Relaefabriken Ab Circuit arrangement for an exchange-powered voice-controlled intercom

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1211271B (en) * 1961-06-08 1966-02-24 Ericsson Telefon Ab L M Circuit arrangement for a voice-controlled intercom or intercom system with hands-free operation
GB1011962A (en) * 1963-05-14 1965-12-01 Northern Electric Co Improvements in or relating to electrical control circuits

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1160897B (en) * 1957-11-26 1964-01-09 Svenska Relaefabriken Ab Circuit arrangement for an exchange-powered voice-controlled intercom

Also Published As

Publication number Publication date
GB779172A (en) 1957-07-17
DE1049430B (en) 1959-01-29
NL97209C (en)
CH333371A (en) 1958-10-15
BE535941A (en)

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