FR2515454A1 - Dispositif de reduction de brouillage - Google Patents
Dispositif de reduction de brouillage Download PDFInfo
- Publication number
- FR2515454A1 FR2515454A1 FR8217373A FR8217373A FR2515454A1 FR 2515454 A1 FR2515454 A1 FR 2515454A1 FR 8217373 A FR8217373 A FR 8217373A FR 8217373 A FR8217373 A FR 8217373A FR 2515454 A1 FR2515454 A1 FR 2515454A1
- Authority
- FR
- France
- Prior art keywords
- signal
- scrambling
- echo
- values
- reproduction
- 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.)
- Withdrawn
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
- H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
- H04B3/237—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers using two adaptive filters, e.g. for near end and for end echo cancelling
-
- 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
-
- 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
- H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
- H04B3/234—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers using double talk detection
-
- 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
- H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
- H04B3/238—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers using initial training sequence
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Noise Elimination (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US31449081A | 1981-10-23 | 1981-10-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2515454A1 true FR2515454A1 (fr) | 1983-04-29 |
Family
ID=23220171
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8217373A Withdrawn FR2515454A1 (fr) | 1981-10-23 | 1982-10-18 | Dispositif de reduction de brouillage |
Country Status (8)
Country | Link |
---|---|
JP (1) | JPS5881346A (nl) |
KR (1) | KR840002179A (nl) |
AU (1) | AU8965682A (nl) |
DE (1) | DE3238564A1 (nl) |
FR (1) | FR2515454A1 (nl) |
GB (1) | GB2109207A (nl) |
NL (1) | NL8204096A (nl) |
SE (1) | SE8205839L (nl) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1238381A (en) * | 1985-03-14 | 1988-06-21 | Ephraim Arnon | Multi-stage echo canceller |
US4868874A (en) * | 1986-04-18 | 1989-09-19 | Hitachi, Ltd. | Echo canceller |
AU614447B2 (en) * | 1988-12-01 | 1991-08-29 | Nec Corporation | Echo canceller with means for determining filter coefficients from autocorrelation and cross-correlation coefficients |
US5471527A (en) | 1993-12-02 | 1995-11-28 | Dsc Communications Corporation | Voice enhancement system and method |
US5631899A (en) * | 1995-05-31 | 1997-05-20 | Lucent Technologies Inc. | Acoustic echo canceler |
GB2308283A (en) * | 1995-12-16 | 1997-06-18 | Ibm | System and method for echo cancellation |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3754105A (en) * | 1968-12-20 | 1973-08-21 | W Poschenrieder | Circuit arrangement for echo suppression in a voice circuit on a four-wire transmission system upon transfer to a two-wire transmission line |
US4282411A (en) * | 1979-06-04 | 1981-08-04 | Tellabs, Inc. | Residual echo suppressor for echo canceller |
DE3116674A1 (de) * | 1980-04-28 | 1982-01-14 | Kokusai Denshin Denwa K.K., Tokyo | Echo-steuersystem |
EP0044598A1 (fr) * | 1980-07-21 | 1982-01-27 | Telecommunications Radioelectriques Et Telephoniques T.R.T. | Dispositif d'annulation d'un signal d'écho composite |
-
1982
- 1982-10-14 SE SE8205839A patent/SE8205839L/ not_active Application Discontinuation
- 1982-10-18 DE DE19823238564 patent/DE3238564A1/de not_active Withdrawn
- 1982-10-18 FR FR8217373A patent/FR2515454A1/fr not_active Withdrawn
- 1982-10-20 GB GB08229956A patent/GB2109207A/en not_active Withdrawn
- 1982-10-21 AU AU89656/82A patent/AU8965682A/en not_active Abandoned
- 1982-10-21 KR KR1019820004732A patent/KR840002179A/ko unknown
- 1982-10-22 NL NL8204096A patent/NL8204096A/nl not_active Application Discontinuation
- 1982-10-23 JP JP57185393A patent/JPS5881346A/ja active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3754105A (en) * | 1968-12-20 | 1973-08-21 | W Poschenrieder | Circuit arrangement for echo suppression in a voice circuit on a four-wire transmission system upon transfer to a two-wire transmission line |
US4282411A (en) * | 1979-06-04 | 1981-08-04 | Tellabs, Inc. | Residual echo suppressor for echo canceller |
DE3116674A1 (de) * | 1980-04-28 | 1982-01-14 | Kokusai Denshin Denwa K.K., Tokyo | Echo-steuersystem |
EP0044598A1 (fr) * | 1980-07-21 | 1982-01-27 | Telecommunications Radioelectriques Et Telephoniques T.R.T. | Dispositif d'annulation d'un signal d'écho composite |
Non-Patent Citations (1)
Title |
---|
IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, Conference Record, vol. 3 de 3, Philadelphia, Pa, 13-17 juin 1982, New York (US) * |
Also Published As
Publication number | Publication date |
---|---|
SE8205839D0 (sv) | 1982-10-14 |
KR840002179A (ko) | 1984-06-11 |
JPS5881346A (ja) | 1983-05-16 |
SE8205839L (sv) | 1983-04-24 |
AU8965682A (en) | 1983-04-28 |
DE3238564A1 (de) | 1983-05-05 |
GB2109207A (en) | 1983-05-25 |
NL8204096A (nl) | 1983-05-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |