RO85240B - Dispozitiv de ascultare si convorbire libera pentru aparate telefonice - Google Patents

Dispozitiv de ascultare si convorbire libera pentru aparate telefonice

Info

Publication number
RO85240B
RO85240B RO106073A RO10607381A RO85240B RO 85240 B RO85240 B RO 85240B RO 106073 A RO106073 A RO 106073A RO 10607381 A RO10607381 A RO 10607381A RO 85240 B RO85240 B RO 85240B
Authority
RO
Romania
Prior art keywords
listening
free
hand
telephone sets
reaction
Prior art date
Application number
RO106073A
Other languages
English (en)
Other versions
RO85240A (ro
Inventor
Helmuth Kammholz
Claus-Peter Kaufmann
Hans Friedrich Strasser
Original Assignee
Veb Fernmeldewerk Nordhausen
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 Veb Fernmeldewerk Nordhausen filed Critical Veb Fernmeldewerk Nordhausen
Publication of RO85240A publication Critical patent/RO85240A/ro
Publication of RO85240B publication Critical patent/RO85240B/ro

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)
  • Telephone Set Structure (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)

Abstract

Schema de montaj pentru un aparat de telefonat cu dispozitiv de ascultare si de convorbire libera este înzestrata în special pentru rationalizarea lucrului de administratie, cu un aparat manual depus pe carcasa aparatului de telefonat si cu un difuzor. Scopul inventiei consta în a procura o schema de montaj pentru un aparat de telefonat cu dispozitiv de ascultare si de convorbire libera care împiedica cu un efort minim, fenomenele de reactie între partea de emisie si de reactie si care garanteaza chiar pentru lungimi mari de conducta, caracteristici de transmitere bune.
RO106073A 1980-12-23 1981-12-22 Dispozitiv de ascultare si convorbire libera pentru aparate telefonice RO85240B (ro)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD22657380A DD154419A1 (de) 1980-12-23 1980-12-23 Schaltungsanordnung fuer einen fernsprechapparat mit mithoer-und freisprecheinrichtung

Publications (2)

Publication Number Publication Date
RO85240A RO85240A (ro) 1984-09-29
RO85240B true RO85240B (ro) 1984-10-30

Family

ID=5528312

Family Applications (1)

Application Number Title Priority Date Filing Date
RO106073A RO85240B (ro) 1980-12-23 1981-12-22 Dispozitiv de ascultare si convorbire libera pentru aparate telefonice

Country Status (6)

Country Link
CS (1) CS247107B1 (ro)
CU (1) CU21478A3 (ro)
DD (1) DD154419A1 (ro)
DE (1) DE3129506A1 (ro)
HU (1) HU187462B (ro)
RO (1) RO85240B (ro)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3307552A1 (de) * 1983-03-03 1984-09-06 Hans Widmaier Fabrik für Apparate der Fernmelde- und Feinwerktechnik, 8000 München Schaltung zur pfeifunterdrueckung bei fernsprechapparaten mit lauthoerverstaerker
DE3329476A1 (de) * 1983-08-16 1985-03-07 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Schaltungsanordnung zur einschaltung von steuereinrichtungen bei fernsprechapparaten
DE3505213A1 (de) * 1985-02-15 1986-08-21 Deutsche Fernsprecher Gesellschaft Mbh Marburg, 3550 Marburg Schaltung in einem fernsprechapparat
DE4329638C2 (de) * 1993-09-02 1996-10-24 Telefunken Microelectron Lauthöreinrichtung
DE29614668U1 (de) 1996-08-24 1996-11-14 Kroos, Heinz Thomas, 33129 Delbrück Freisprecheinheit für Mobiltelefone (Handys)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL155700B (nl) * 1971-12-08 1978-01-16 Philips Nv Luidsprekende telefooninrichting.
DE2607016A1 (de) * 1976-02-19 1977-08-25 Manfred Lau Elektronischer telefonverstaerker
FR2376576A1 (fr) * 1976-12-31 1978-07-28 Girard J Philippe Perfectionnements aux postes telephoniques a mains libres

Also Published As

Publication number Publication date
DD154419A1 (de) 1982-03-17
CS752581A1 (en) 1985-06-13
DE3129506C2 (ro) 1989-09-07
RO85240A (ro) 1984-09-29
CS247107B1 (en) 1986-11-13
CU21478A3 (en) 1987-10-12
HU187462B (en) 1986-01-28
DE3129506A1 (de) 1982-07-01

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