SE346437B - - Google Patents

Info

Publication number
SE346437B
SE346437B SE17726/67A SE1772667A SE346437B SE 346437 B SE346437 B SE 346437B SE 17726/67 A SE17726/67 A SE 17726/67A SE 1772667 A SE1772667 A SE 1772667A SE 346437 B SE346437 B SE 346437B
Authority
SE
Sweden
Application number
SE17726/67A
Inventor
B Peroni
Original Assignee
Consiglio Nazionale Ricerche
Fondazione Bordoni U
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 Consiglio Nazionale Ricerche, Fondazione Bordoni U filed Critical Consiglio Nazionale Ricerche
Publication of SE346437B publication Critical patent/SE346437B/xx

Links

Classifications

    • 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
SE17726/67A 1966-12-24 1967-12-22 SE346437B (xx)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT4378566 1966-12-24
IT3706467 1967-05-27

Publications (1)

Publication Number Publication Date
SE346437B true SE346437B (xx) 1972-07-03

Family

ID=26329052

Family Applications (1)

Application Number Title Priority Date Filing Date
SE17726/67A SE346437B (xx) 1966-12-24 1967-12-22

Country Status (7)

Country Link
US (1) US3567873A (xx)
CH (1) CH492357A (xx)
DE (1) DE1537650A1 (xx)
FR (1) FR1548145A (xx)
GB (1) GB1207368A (xx)
NL (1) NL6717482A (xx)
SE (1) SE346437B (xx)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1921018B1 (de) * 1969-04-24 1971-01-14 Siemens Ag Echosperre fuer einen Sprechkreis auf einem Vierdrahtuebertragungssystem
DE1920946B1 (xx) * 1969-04-24 1970-10-22 Siemens Ag
DE1920961A1 (de) * 1969-04-24 1970-10-22 Siemens Ag Selektive Echosperre fuer einen Sprechkreis auf einem Vierdrahtuebertragungssystem
DE1920962B1 (de) * 1969-04-24 1970-11-12 Siemens Ag Echosperre mit zwei aus parallel arbeitenden Bandpaessen bestehenden Filtersaetzen fuer einen Sprechkreis auf einem Vierdrahtuebertragungssystem
DE1920959B1 (de) * 1969-04-24 1970-10-22 Siemens Ag Mit zwei wechselweise einschaltbaren Filtersätzen ausgestattete Echosperre für einen Sprechkreis auf einem Vierdrahtühertragungssystem
DE2054073B2 (de) * 1970-11-03 1972-09-28 Siemens AG, 1000 Berlin u. 8000 München Echosperre fuer einen sprechkreis auf einem vierdraht-uebertragungssystem
US3699271A (en) * 1970-11-16 1972-10-17 Bell Telephone Labor Inc Speech processor using multiband controlled center clipping
US3900708A (en) * 1972-03-31 1975-08-19 Siemens Ag Selective echo suppressor
US3946170A (en) * 1973-11-29 1976-03-23 Brooks Fred A Self regulating telephone sets
US3941948A (en) * 1973-11-29 1976-03-02 Brooks Fred A Four-wire interface regulator for long distance trunk circuits
US4031338A (en) * 1976-02-10 1977-06-21 Communications Satellite Corporation (Comsat) Echo suppressor using frequency-selective center clipping
US4644108A (en) * 1982-10-27 1987-02-17 International Business Machines Corporation Adaptive sub-band echo suppressor
GB2156184A (en) * 1984-03-21 1985-10-02 Philips Electronic Associated Loudspeaking telephone instrument
US4641339A (en) * 1985-03-27 1987-02-03 Itt Corporation Variable bandwidth handsfree telephone using switched capacitor filtering
US5271057A (en) * 1991-10-09 1993-12-14 Bell Communications Research, Inc. Audio processing system for teleconferencing system
US6130943A (en) * 1996-12-23 2000-10-10 Mci Communications Corporation Method and apparatus for suppressing echo in telephony
US6047022A (en) 1997-02-28 2000-04-04 Orckit Communication Ltd. Apparatus and method for transmission of high speed data over communication channels
US6798881B2 (en) * 1999-06-07 2004-09-28 Acoustic Technologies, Inc. Noise reduction circuit for telephones
US6963642B1 (en) * 1999-12-30 2005-11-08 Acoustic Technology, Inc. Band-by-band full duplex communication
US7433462B2 (en) * 2002-10-31 2008-10-07 Plantronics, Inc Techniques for improving telephone audio quality
US20050285935A1 (en) * 2004-06-29 2005-12-29 Octiv, Inc. Personal conferencing node
US20050286443A1 (en) * 2004-06-29 2005-12-29 Octiv, Inc. Conferencing system

Also Published As

Publication number Publication date
CH492357A (it) 1970-06-15
NL6717482A (xx) 1968-06-25
FR1548145A (xx) 1968-11-29
GB1207368A (en) 1970-09-30
DE1537650A1 (de) 1970-01-08
US3567873A (en) 1971-03-02

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