CU21478A3 - Telephonical apparatus connection with listening device and intercommunication system - Google Patents

Telephonical apparatus connection with listening device and intercommunication system

Info

Publication number
CU21478A3
CU21478A3 CU35575A CU35575A CU21478A3 CU 21478 A3 CU21478 A3 CU 21478A3 CU 35575 A CU35575 A CU 35575A CU 35575 A CU35575 A CU 35575A CU 21478 A3 CU21478 A3 CU 21478A3
Authority
CU
Cuba
Prior art keywords
telephonical
listening device
apparatus connection
intercommunication system
intercommunication
Prior art date
Application number
CU35575A
Other languages
English (en)
Inventor
Helmut Kammholz
Claus-Peter Kaufmann
Hans Friedrich Strasser
Original Assignee
Nordhausen Veb Fernmeldewerk
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 Nordhausen Veb Fernmeldewerk filed Critical Nordhausen Veb Fernmeldewerk
Publication of CU21478A3 publication Critical patent/CU21478A3/es

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)
CU35575A 1980-12-23 1981-12-22 Telephonical apparatus connection with listening device and intercommunication system CU21478A3 (en)

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 (1)

Publication Number Publication Date
CU21478A3 true CU21478A3 (en) 1987-10-12

Family

ID=5528312

Family Applications (1)

Application Number Title Priority Date Filing Date
CU35575A CU21478A3 (en) 1980-12-23 1981-12-22 Telephonical apparatus connection with listening device and intercommunication system

Country Status (6)

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

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
CS752581A1 (en) 1985-06-13
HU187462B (en) 1986-01-28
RO85240A (ro) 1984-09-29
DE3129506A1 (de) 1982-07-01
RO85240B (ro) 1984-10-30
CS247107B1 (en) 1986-11-13
DE3129506C2 (es) 1989-09-07
DD154419A1 (de) 1982-03-17

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