BR7800019A - Aperfeicoamentos em postos telefonicos a maos-livres - Google Patents

Aperfeicoamentos em postos telefonicos a maos-livres

Info

Publication number
BR7800019A
BR7800019A BR7800019A BR7800019A BR7800019A BR 7800019 A BR7800019 A BR 7800019A BR 7800019 A BR7800019 A BR 7800019A BR 7800019 A BR7800019 A BR 7800019A BR 7800019 A BR7800019 A BR 7800019A
Authority
BR
Brazil
Prior art keywords
hands
free
posts
telephone
telephone posts
Prior art date
Application number
BR7800019A
Other languages
English (en)
Inventor
J Girard
A Bernard
Original Assignee
Girard J Philippe
A Bernard
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 Girard J Philippe, A Bernard filed Critical Girard J Philippe
Publication of BR7800019A publication Critical patent/BR7800019A/pt

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
    • H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Amplifiers (AREA)
  • Transmitters (AREA)
  • Telephone Function (AREA)
BR7800019A 1976-12-31 1978-01-02 Aperfeicoamentos em postos telefonicos a maos-livres BR7800019A (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7639791A FR2376576A1 (fr) 1976-12-31 1976-12-31 Perfectionnements aux postes telephoniques a mains libres

Publications (1)

Publication Number Publication Date
BR7800019A true BR7800019A (pt) 1978-10-24

Family

ID=9181836

Family Applications (1)

Application Number Title Priority Date Filing Date
BR7800019A BR7800019A (pt) 1976-12-31 1978-01-02 Aperfeicoamentos em postos telefonicos a maos-livres

Country Status (11)

Country Link
US (1) US4162374A (pt)
JP (1) JPS5375709A (pt)
BR (1) BR7800019A (pt)
CA (1) CA1101142A (pt)
DE (1) DE2758573C3 (pt)
ES (1) ES465658A1 (pt)
FR (1) FR2376576A1 (pt)
GB (1) GB1560330A (pt)
IE (1) IE46131B1 (pt)
PT (1) PT67464B (pt)
ZA (1) ZA777704B (pt)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD154419A1 (de) * 1980-12-23 1982-03-17 Helmut Kammholz Schaltungsanordnung fuer einen fernsprechapparat mit mithoer-und freisprecheinrichtung
DE3218501A1 (de) * 1981-12-05 1983-11-17 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schaltungsanordnung zur gegensinnigen verstaerkungssteuerung
DE3148202A1 (de) * 1981-12-05 1983-06-09 Licentia Patent-Verwaltungs-GmbH, 60325 Frankfurt "schaltungsanordnung zur gegensinnigen verstaerkungssteuerung von verstaerkern"
DE3213968C2 (de) * 1982-04-16 1984-06-14 Deutsche Fernsprecher Gesellschaft Mbh Marburg, 3550 Marburg Fernsprechapparat
DE3616314A1 (de) * 1986-05-13 1987-11-19 Krone Ag Fernsprechapparat mit freisprecheinrichtung
US5058155A (en) * 1989-12-01 1991-10-15 Gn Netcom A/S Multipurpose headset amplifier
US20070041606A1 (en) * 2005-08-22 2007-02-22 David Clark Company Incorporated Apparatus and method for noise cancellation in communication headset using dual-coil speaker

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL125146C (pt) * 1958-12-29
FR2102614A5 (pt) * 1970-08-06 1972-04-07 Barok Albert
US4049911A (en) * 1976-01-06 1977-09-20 Norcon Electronics Inc. Talk-through unit with voice controlled switching with turn off delay variable from 250-500 milliseconds depending on voice amplitude

Also Published As

Publication number Publication date
FR2376576B1 (pt) 1981-11-27
PT67464A (fr) 1978-01-01
ZA777704B (en) 1978-10-25
ES465658A1 (es) 1978-10-01
GB1560330A (en) 1980-02-06
CA1101142A (en) 1981-05-12
DE2758573A1 (de) 1978-07-06
US4162374A (en) 1979-07-24
IE780013L (en) 1978-06-30
IE46131B1 (en) 1983-03-09
JPS5375709A (en) 1978-07-05
FR2376576A1 (fr) 1978-07-28
PT67464B (fr) 1979-05-25
DE2758573B2 (de) 1980-02-14
DE2758573C3 (de) 1980-10-09

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