JPH09507120A - エコー打消装置においてエコーの位置を決定する方法 - Google Patents
エコー打消装置においてエコーの位置を決定する方法Info
- Publication number
- JPH09507120A JPH09507120A JP7517216A JP51721695A JPH09507120A JP H09507120 A JPH09507120 A JP H09507120A JP 7517216 A JP7517216 A JP 7517216A JP 51721695 A JP51721695 A JP 51721695A JP H09507120 A JPH09507120 A JP H09507120A
- Authority
- JP
- Japan
- Prior art keywords
- echo
- signal
- sum
- delay
- samples
- 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.)
- Ceased
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
Landscapes
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Engineering & Computer Science (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Filters That Use Time-Delay Elements (AREA)
- Telephone Function (AREA)
- Circuit For Audible Band Transducer (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
Claims (1)
- 【特許請求の範囲】 1.出力ポートと、入力ポートと、エコー位置と出力ポートとの間のエコー経 路における純粋な遅延成分を補償する調整可能な遅延ユニットと、エコー経路へ 出て行く信号からエコー経路の最大許容巾よりも短いエコー位置の推定値を計算 するデジタルフィルタとを備えたエコー打消装置においてエコー位置に適応する 方法であって、 a)エコー経路へと出て行くスピーチ信号のN個のサンプルを取り出してそれ らをメモリに記憶し、 b)エコー経路から到来する信号のN個のサンプルを取り出してそれらをメモ リに記憶し、 c)出て行く信号の記憶されたN個のサンプルと、到来する信号の記憶された N個のサンプルとの間の相関を計算し、 d)エコー経路から到来する信号の新たなサンプルを取り出してメモリから最 も古いサンプルを削除し、到来信号のN個の最新のサンプルが記憶されるように し、 e)上記段階c)及びd)をM回繰り返し、これは、上記遅延の最長許容時間 インターバルと実際のエコー位置との合成長さに少なくとも対応し、 f)計算された相関に基づいてエコーの中心を決定し、 g)計算された相関値に基づいて、遅延位置が充分な確実さで見つかったかど うか決定し、もしそうでなければ、上記段階a)に戻り、 h)デジタルフィルタの中心がこのように決定されたエコーの中心に整列され るように上記遅延手段の遅延を調整する、 という段階を備えたことを特徴とする方法。 2.上記相関の計算は、出て行く信号のN個のサンプルと、到来する信号のN 個のサンプルとのスカラー積を計算することを含む請求項1に記載の方法。 3.上記エコーの中心の決定は、 X個の次々の相関結果の平方の和を計算し、 上記平方の和の中でY個の次々の値の最も大きな和を見出し、 上記最も大きな和を形成する平方の和をゼロにセットし、 上記平方の和の中でY個の次々の値の最も大きな和を新たに見出し、 最初に決定された最も大きな和と最後に決定された最も大きな和とを比較し、 最初に決定された最も大きな和と最後に決定された最も大きな和との比が所定 のスレッシュホールド値より大きい場合には、エコーの中心を、最初に決定され た和を構成する相関結果の位置に整列させ、 最初に決定された和と最後に決定された和との比が所定のスレッシュホールド 値より低い場合には、新たな相関結果の計算で継続する、 という段階を備えた請求項2に記載の方法。 4.Nは128であり、そしてMは512である請求項の前記いずれかに記載 の方法。 5.Xは8であり、そしてYは8である請求項の前記いずれかに記載の方法。 6.出て行く信号のレベルを測定し、出て行く信号のレベルが所定のスレッシ ュホールド値を越えたときに、サンプリングを開始する請求項の前記いずれかに 記載の方法。 7.到来する信号のレベルを測定し、到来する信号のレベルがエコー位置のサ ーチ中に所定のスレッシュホールド値を越えたときに、出て行く信号のレベルを 減衰する請求項の前記いずれかに記載の方法。 8.エコー位置のサーチは、通話の開始の情報が電話交換機から得られたとき に開始される請求項の前記いずれかに記載の方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI935834A FI935834A (fi) | 1993-12-23 | 1993-12-23 | Menetelmä kaikukohtaan sovittautumiseksi kaiunpoistajassa |
FI935834 | 1993-12-23 | ||
PCT/FI1994/000577 WO1995017784A1 (en) | 1993-12-23 | 1994-12-21 | Method for determining the location of echo in an echo cancellar |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2006010270A Division JP2006191650A (ja) | 1993-12-23 | 2006-01-18 | エコー打消装置においてエコーの位置を決定する方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH09507120A true JPH09507120A (ja) | 1997-07-15 |
Family
ID=8539171
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7517216A Ceased JPH09507120A (ja) | 1993-12-23 | 1994-12-21 | エコー打消装置においてエコーの位置を決定する方法 |
JP2006010270A Pending JP2006191650A (ja) | 1993-12-23 | 2006-01-18 | エコー打消装置においてエコーの位置を決定する方法 |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2006010270A Pending JP2006191650A (ja) | 1993-12-23 | 2006-01-18 | エコー打消装置においてエコーの位置を決定する方法 |
Country Status (10)
Country | Link |
---|---|
US (1) | US5737410A (ja) |
EP (1) | EP0736235B1 (ja) |
JP (2) | JPH09507120A (ja) |
CN (1) | CN1068742C (ja) |
AT (1) | ATE203360T1 (ja) |
AU (1) | AU680981B2 (ja) |
DE (1) | DE69427770T2 (ja) |
FI (1) | FI935834A (ja) |
HK (1) | HK1011472A1 (ja) |
WO (1) | WO1995017784A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2005528039A (ja) * | 2002-05-23 | 2005-09-15 | アナログ デバイスズ インコーポレイテッド | 等化用遅延時間推定 |
JP2009232417A (ja) * | 2008-03-25 | 2009-10-08 | Fujitsu Ltd | 測定方法、エコー発生箇所特定方法、測定装置、およびエコー発生箇所特定装置 |
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US5646990A (en) * | 1995-09-21 | 1997-07-08 | Rockwell International Corporation | Efficient speakerphone anti-howling system |
DE19543666A1 (de) * | 1995-11-23 | 1997-05-28 | Sel Alcatel Ag | Echokompensator |
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US7046795B2 (en) * | 1997-06-25 | 2006-05-16 | Intel Corporation | Method and apparatus for active latency characterization |
FI974505A (fi) * | 1997-12-12 | 1999-06-13 | Nokia Telecommunications Oy | Menetelmä akustisen kaiun poistamiseksi |
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US6421097B1 (en) * | 1998-07-31 | 2002-07-16 | Intel Corporation | Method and apparatus for reducing flicker in a video image sequence |
SE516143C2 (sv) | 1999-05-10 | 2001-11-26 | Ericsson Telefon Ab L M | Skattning av ren fördröjning |
KR100330237B1 (ko) * | 1999-07-19 | 2002-03-25 | 윤종용 | 반향 지연 추정 장치 및 방법 |
US6421443B1 (en) * | 1999-07-23 | 2002-07-16 | Acoustic Technologies, Inc. | Acoustic and electronic echo cancellation |
WO2001008380A1 (en) * | 1999-07-23 | 2001-02-01 | Acoustic Technologies, Inc. | Acoustic and electronic echo cancellation using high resolution delay line |
GB2354414B (en) * | 1999-09-14 | 2004-12-22 | Mitel Corp | Locating network echos |
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US7164659B2 (en) * | 1999-12-09 | 2007-01-16 | Broadcom Corporation | Adaptive gain control based on echo canceller performance information |
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US7388954B2 (en) | 2002-06-24 | 2008-06-17 | Freescale Semiconductor, Inc. | Method and apparatus for tone indication |
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CN100452929C (zh) * | 2002-11-29 | 2009-01-14 | Tcl王牌电子(深圳)有限公司 | 以回声抵消测量非消声室扬声器方法 |
US20040252652A1 (en) * | 2003-06-10 | 2004-12-16 | Alexander Berestesky | Cross correlation, bulk delay estimation, and echo cancellation |
CN1914819B (zh) * | 2004-01-29 | 2010-08-11 | Nxp股份有限公司 | 利用干扰电平控制步长的回声消除器 |
ES2247916B1 (es) * | 2004-03-16 | 2007-04-01 | Egatel, S.L. | Procedimiento y dispositivo de cancelacion de ecos. |
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-
1993
- 1993-12-23 FI FI935834A patent/FI935834A/fi unknown
-
1994
- 1994-12-21 DE DE69427770T patent/DE69427770T2/de not_active Expired - Lifetime
- 1994-12-21 EP EP95903826A patent/EP0736235B1/en not_active Expired - Lifetime
- 1994-12-21 AU AU12748/95A patent/AU680981B2/en not_active Ceased
- 1994-12-21 WO PCT/FI1994/000577 patent/WO1995017784A1/en active IP Right Grant
- 1994-12-21 CN CN94194620A patent/CN1068742C/zh not_active Expired - Fee Related
- 1994-12-21 AT AT95903826T patent/ATE203360T1/de not_active IP Right Cessation
- 1994-12-21 US US08/666,412 patent/US5737410A/en not_active Expired - Lifetime
- 1994-12-21 JP JP7517216A patent/JPH09507120A/ja not_active Ceased
-
1998
- 1998-11-30 HK HK98112544A patent/HK1011472A1/xx not_active IP Right Cessation
-
2006
- 2006-01-18 JP JP2006010270A patent/JP2006191650A/ja active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005528039A (ja) * | 2002-05-23 | 2005-09-15 | アナログ デバイスズ インコーポレイテッド | 等化用遅延時間推定 |
JP2009232417A (ja) * | 2008-03-25 | 2009-10-08 | Fujitsu Ltd | 測定方法、エコー発生箇所特定方法、測定装置、およびエコー発生箇所特定装置 |
JP4621266B2 (ja) * | 2008-03-25 | 2011-01-26 | 富士通株式会社 | 測定方法、エコー発生箇所特定方法、測定装置、およびエコー発生箇所特定装置 |
Also Published As
Publication number | Publication date |
---|---|
HK1011472A1 (en) | 1999-07-09 |
EP0736235B1 (en) | 2001-07-18 |
CN1139501A (zh) | 1997-01-01 |
ATE203360T1 (de) | 2001-08-15 |
DE69427770T2 (de) | 2002-05-23 |
DE69427770D1 (de) | 2001-08-23 |
JP2006191650A (ja) | 2006-07-20 |
AU1274895A (en) | 1995-07-10 |
AU680981B2 (en) | 1997-08-14 |
WO1995017784A1 (en) | 1995-06-29 |
EP0736235A1 (en) | 1996-10-09 |
FI935834A0 (fi) | 1993-12-23 |
FI935834A (fi) | 1995-06-24 |
US5737410A (en) | 1998-04-07 |
CN1068742C (zh) | 2001-07-18 |
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