AU7166087A - Device for improving the side-tone attenuation or loop amplification in interphone systems - Google Patents

Device for improving the side-tone attenuation or loop amplification in interphone systems

Info

Publication number
AU7166087A
AU7166087A AU71660/87A AU7166087A AU7166087A AU 7166087 A AU7166087 A AU 7166087A AU 71660/87 A AU71660/87 A AU 71660/87A AU 7166087 A AU7166087 A AU 7166087A AU 7166087 A AU7166087 A AU 7166087A
Authority
AU
Australia
Prior art keywords
improving
loop amplification
tone attenuation
interphone systems
interphone
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.)
Abandoned
Application number
AU71660/87A
Inventor
Klaus Genuit
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.)
Head Stereo GmbH Kopfbezogene Aufnahme und Weidergabetechnik and Co Messtechnik KG
Original Assignee
Head Stereo GmbH
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 Head Stereo GmbH filed Critical Head Stereo GmbH
Publication of AU7166087A publication Critical patent/AU7166087A/en
Abandoned 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
    • H04M9/087—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using different frequency bands for transmitting and receiving paths ; using phase shifting arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • H04B3/21—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a set of bandfilters

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Telephone Function (AREA)
AU71660/87A 1986-03-03 1987-02-28 Device for improving the side-tone attenuation or loop amplification in interphone systems Abandoned AU7166087A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3606844 1986-03-03
DE3606844 1986-03-03

Publications (1)

Publication Number Publication Date
AU7166087A true AU7166087A (en) 1987-09-28

Family

ID=6295351

Family Applications (1)

Application Number Title Priority Date Filing Date
AU71660/87A Abandoned AU7166087A (en) 1986-03-03 1987-02-28 Device for improving the side-tone attenuation or loop amplification in interphone systems

Country Status (5)

Country Link
EP (1) EP0235765A1 (en)
JP (1) JPS63503187A (en)
AU (1) AU7166087A (en)
FI (1) FI874759A0 (en)
WO (1) WO1987005456A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2246055A (en) * 1990-04-06 1992-01-15 Bsb Electronics Limited Duplex audio communication system
US5271057A (en) * 1991-10-09 1993-12-14 Bell Communications Research, Inc. Audio processing system for teleconferencing system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE505114A (en) * 1950-08-12
US3175051A (en) * 1960-12-16 1965-03-23 Bell Telephone Labor Inc Echo suppressor using comb filters
US3622714A (en) * 1969-09-02 1971-11-23 Bell Telephone Labor Inc Telephonic transmission using complementary comb filters
GB2156185A (en) * 1984-03-21 1985-10-02 Philips Electronic Associated Loudspeaking telephone instrument

Also Published As

Publication number Publication date
FI874759A (en) 1987-10-29
WO1987005456A1 (en) 1987-09-11
EP0235765A1 (en) 1987-09-09
FI874759A0 (en) 1987-10-29
JPS63503187A (en) 1988-11-17

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