ATA221987A - HANDS-FREE DEVICE - Google Patents
HANDS-FREE DEVICEInfo
- 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
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)
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)
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)
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 |
-
1987
- 1987-09-03 AT AT221987A patent/AT393426B/en not_active IP Right Cessation
-
1988
- 1988-07-01 DE DE19883822353 patent/DE3822353A1/en active Granted
Also Published As
Publication number | Publication date |
---|---|
AT393426B (en) | 1991-10-25 |
DE3822353C2 (en) | 1989-09-28 |
DE3822353A1 (en) | 1989-03-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ELJ | Ceased due to non-payment of the annual fee |