JP2000509593A - 2線4線変換のための回路装置 - Google Patents
2線4線変換のための回路装置Info
- Publication number
- JP2000509593A JP2000509593A JP10533531A JP53353198A JP2000509593A JP 2000509593 A JP2000509593 A JP 2000509593A JP 10533531 A JP10533531 A JP 10533531A JP 53353198 A JP53353198 A JP 53353198A JP 2000509593 A JP2000509593 A JP 2000509593A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- filter
- supplied
- digital
- circuit device
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0002—Modulated-carrier systems analog front ends; means for connecting modulators, demodulators or transceivers to a transmission line
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
Description
Claims (1)
- 【特許請求の範囲】 1.2線4線変換のための回路装置であって、 入力側がデジタル2線受信路に接続されておりかつ該受信路を介してデジタル受 信信号が供給されるようになっている受信手段を備え、 該受信手段に後置接続されている信号処理手段を備え、該信号処理手段は第1の 信号および第2の信号を送出し、 前記第1の信号が供給されかつ第3の信号を送出するエコー抑圧手段を備え、 前記第2の信号が供給されかつ第4の信号を送出するDA変換手段を備え、 アナログ4線送受信路に接続されているハイブリッド回路を備え、該ハイブリッ ド回路には第4の信号が供給されかつ第5の信号を送出し、 該第5の信号が供給されかつ第6の信号を送出するAD変換手段を備え、かつ 前記第6の信号が供給されかつ出力側がデジタル2線送信路に接続されておりか つ該送信路にデジタル送信信号を送出する送信手段を備えている 形式の回路装置において、 前記DA変換手段はシグマ・デルタ変調器を有している ことを特徴とする回路装置。 2.前記DA変換手段は、前記第2の信号が供給される補間フィルタと、該補 間フィルタに後置接続されているデジタルノイズ整形フィルタと、該ノイズ整形 フィルタに後置接続されている再構成フィルタとを有している 請求項1記載の回路装置。 3.前記デジタルノイズ整形フィルタの出力信号は近似フィルタに供給され、 該近似フィルタにはエコー推定フィルタが後置接続されておりかつ該エコー推定 フィルタの出力信号は前記第6の信号に減算的に重畳される 請求項1または2記載の回路装置。 4.遅延推定フィルタの入力側に、前記第2の信号が供給されかつ該遅延推定 フィルタの出力信号は前記近似フィルタの出力信号に減算的に重畳されかつ該近 似フィルタの出力信号と一緒に前記エコー推定フィルタに供給される 請求項1から3までのいずれか1項記載の回路装置。 5.サンプリングレートを低減変換するために、独自のデジタル間引きフィル タが設けられており、該間引きフィルタは前記近似フィルタに後置接続されてい る 請求項1から4までのいずれか1項記載の回路装置。 6.前記デジタル間引きフィルタにハイブリッド推定フィルタが後置接続され ており、該ハイブリッド推 定フィルタは前記ハイブリッド回路の特性を近似する請求項1から5までのいず れか1項記載の回路装置。 7.前記エコー推定フィルタの出力信号は、別の補間フィルタ、別のノイズ整 形フィルタ並びに別の間引きフィルタを中間介挿して前記AD変換手段の出力信 号と直列に結合される 請求項1から6までのいずれか1項記載の回路装置。 8.前記信号処理手段は更に第7の信号を送出し、該第7の信号はエコー推定 手段を中間介挿して前記第6の信号と減算的に結合されて前記送信手段に供給さ れる 請求項1から7までのいずれか1項記載の回路装置。 9.前記信号処理手段は更に第8の信号を送出し、該第8の信号は前記エコー 抑圧手段を制御するように設定されている 請求項1から8までのいずれか1項記載の回路装置。 10.前記AD変換手段と前記送信手段との間に、信号を処理するための複数の 別の手段が挿入されている請求項1から9までのいずれか1項記載の回路装置。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19701785 | 1997-01-20 | ||
DE19701785.1 | 1997-01-20 | ||
PCT/DE1998/000169 WO1998032241A2 (de) | 1997-01-20 | 1998-01-20 | Schaltungsanordnung zur zweidraht-vierdraht-umsetzung |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2000509593A true JP2000509593A (ja) | 2000-07-25 |
JP3592338B2 JP3592338B2 (ja) | 2004-11-24 |
Family
ID=7817810
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53353198A Expired - Fee Related JP3592338B2 (ja) | 1997-01-20 | 1998-01-20 | 2線4線変換のための回路装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US6594360B1 (ja) |
EP (1) | EP0953234B1 (ja) |
JP (1) | JP3592338B2 (ja) |
DE (1) | DE59802707D1 (ja) |
IL (1) | IL130236A0 (ja) |
WO (1) | WO1998032241A2 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000019767A2 (de) * | 1998-09-30 | 2000-04-06 | Infineon Technologies Ag | Leitungsabschlussvorrichtung für eine teilnehmeranschlussleitung |
US6853626B1 (en) * | 2000-03-22 | 2005-02-08 | National University Of Singapore | Method and apparatus for echo cancellation in an asymmetric communication system |
US7428304B2 (en) * | 2004-08-31 | 2008-09-23 | Silicon Laboratories | Method and apparatus for detecting subscriber alerting signal tones and customer premises equipment alerting signal tones to non-echo canceling modems |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0122594A3 (en) * | 1983-04-18 | 1986-09-10 | International Standard Electric Corporation | Line circuit with echo compensation |
US5051981A (en) * | 1988-01-21 | 1991-09-24 | Codex Corporation | Digital filtering |
JP3158414B2 (ja) * | 1990-06-25 | 2001-04-23 | 日本電気株式会社 | エコーキャンセラ |
US5623513A (en) * | 1993-12-13 | 1997-04-22 | Amati Communications Corporation | Mitigating clipping and quantization effects in digital transmission systems |
US5585802A (en) * | 1994-11-02 | 1996-12-17 | Advanced Micro Devices, Inc. | Multi-stage digital to analog conversion circuit and method |
-
1998
- 1998-01-20 DE DE59802707T patent/DE59802707D1/de not_active Expired - Lifetime
- 1998-01-20 EP EP98907834A patent/EP0953234B1/de not_active Expired - Lifetime
- 1998-01-20 JP JP53353198A patent/JP3592338B2/ja not_active Expired - Fee Related
- 1998-01-20 WO PCT/DE1998/000169 patent/WO1998032241A2/de active IP Right Grant
- 1998-01-20 IL IL13023698A patent/IL130236A0/xx unknown
-
1999
- 1999-07-20 US US09/357,249 patent/US6594360B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0953234A2 (de) | 1999-11-03 |
WO1998032241A2 (de) | 1998-07-23 |
WO1998032241A3 (de) | 1998-09-11 |
IL130236A0 (en) | 2000-06-01 |
DE59802707D1 (de) | 2002-02-21 |
EP0953234B1 (de) | 2001-11-21 |
US6594360B1 (en) | 2003-07-15 |
JP3592338B2 (ja) | 2004-11-24 |
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