ATA221987A - HANDS-FREE DEVICE - Google Patents

HANDS-FREE DEVICE

Info

Publication number
ATA221987A
ATA221987A AT221987A AT221987A ATA221987A AT A221987 A ATA221987 A AT A221987A AT 221987 A AT221987 A AT 221987A AT 221987 A AT221987 A AT 221987A AT A221987 A ATA221987 A AT A221987A
Authority
AT
Austria
Prior art keywords
hands
free device
free
Prior art date
Application number
AT221987A
Other languages
German (de)
Other versions
AT393426B (en
Inventor
Kurt Dipl Ing Winter
Siegfried Mayr
Werner Ing Jacopich
Oskar Dipl Ing Beckmann
Dirsko V Ing Pfeil
Original Assignee
Siemens Ag Oesterreich
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 Siemens Ag Oesterreich filed Critical Siemens Ag Oesterreich
Priority to AT221987A priority Critical patent/AT393426B/en
Priority to DE19883822353 priority patent/DE3822353A1/en
Publication of ATA221987A publication Critical patent/ATA221987A/en
Application granted granted Critical
Publication of AT393426B publication Critical patent/AT393426B/en

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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
AT221987A 1987-09-03 1987-09-03 HANDS-FREE DEVICE AT393426B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT221987A AT393426B (en) 1987-09-03 1987-09-03 HANDS-FREE DEVICE
DE19883822353 DE3822353A1 (en) 1987-09-03 1988-07-01 Hands-free system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT221987A AT393426B (en) 1987-09-03 1987-09-03 HANDS-FREE DEVICE

Publications (2)

Publication Number Publication Date
ATA221987A true ATA221987A (en) 1991-03-15
AT393426B AT393426B (en) 1991-10-25

Family

ID=3530242

Family Applications (1)

Application Number Title Priority Date Filing Date
AT221987A AT393426B (en) 1987-09-03 1987-09-03 HANDS-FREE DEVICE

Country Status (2)

Country Link
AT (1) AT393426B (en)
DE (1) DE3822353A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4111820A1 (en) * 1990-09-12 1992-03-19 Hagenuk Telecom Gmbh Acoustic feedback elimination circuitry for loudspeaking telephone - uses frequency detectors controlling level of attenuation device
DE4229912A1 (en) * 1992-09-08 1994-03-10 Sel Alcatel Ag Method for improving the transmission properties of an electroacoustic system
DE19517469A1 (en) * 1995-05-12 1996-11-14 Sel Alcatel Ag Hands-free procedure for a multi-channel transmission system
DE19538187A1 (en) * 1995-10-13 1997-04-17 Sel Alcatel Ag Method and circuit arrangement for the detection of speech of a distant speaker in a telephone device
GB0021974D0 (en) * 2000-09-07 2000-10-25 Simoco Int Ltd Echo reduction in two-way communication

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE373967A (en) * 1929-10-06
DE1257208B (en) * 1962-04-30 1967-12-28 Fujio Suganuma Automatic volume control for an electro-acoustic loudspeaker system
FR2412210A1 (en) * 1977-12-14 1979-07-13 Cit Alcatel SPEAKER TELEPHONE STATION

Also Published As

Publication number Publication date
DE3822353A1 (en) 1989-03-16
AT393426B (en) 1991-10-25
DE3822353C2 (en) 1989-09-28

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Legal Events

Date Code Title Description
ELJ Ceased due to non-payment of the annual fee