JP3990357B2 - インパルスノイズ抑制装置 - Google Patents
インパルスノイズ抑制装置 Download PDFInfo
- Publication number
- JP3990357B2 JP3990357B2 JP2003535398A JP2003535398A JP3990357B2 JP 3990357 B2 JP3990357 B2 JP 3990357B2 JP 2003535398 A JP2003535398 A JP 2003535398A JP 2003535398 A JP2003535398 A JP 2003535398A JP 3990357 B2 JP3990357 B2 JP 3990357B2
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- JP
- Japan
- Prior art keywords
- error
- impulse noise
- audio data
- digital audio
- state
- 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.)
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- 230000001629 suppression Effects 0.000 title claims description 46
- 238000001514 detection method Methods 0.000 claims abstract description 60
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000005070 sampling Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 10
- 230000006866 deterioration Effects 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
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- Engineering & Computer Science (AREA)
- Computational Linguistics (AREA)
- Quality & Reliability (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Noise Elimination (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Details Of Television Scanning (AREA)
- Emergency Protection Circuit Devices (AREA)
- Floor Finish (AREA)
- Television Signal Processing For Recording (AREA)
Description
状態1(誤りなし)
この状態1では、ディジタルオーディオデータには誤りが無く、正常に受信できている。
状態2(誤り検出能力内の誤り)
状態2での誤りは誤り検出のできる誤りである。
状態3(誤り検出能力を超えた誤り)
状態3での誤りは、誤り検出できない誤りである。
状態1から状態2、状態2から状態1への遷移、状態2から状態3及び状態3から状態2への遷移よりも、状態1から状態3または状態3から状態1への遷移が生じる確率は、非常に少ない。
状態a(誤りなし)
状態aでは、ディジタルオーディオデータには誤りが無く、正常に受信できている。
状態b(誤り検出能力内の誤り)
状態bでは、生じている誤りは誤り検出のできる誤りである。従って検出された誤りは何らかの方法で訂正できる。
状態c(誤り検出はしたが、誤り訂正はできない)
状態cは、たまたま誤り検出が行えた場合である。正しくディジタルオーディオデータを受信できていないことだけは判る状態である。または、誤り検出能力よりも誤り訂正能力の方が低く、誤り検出はできるが、誤り訂正はできない状態である。
状態d(誤り検出能力を超えた誤り)
状態dでは、誤りは、誤り検出ができない誤りであり、誤り訂正もできない状態である。
(2)BよりAが大きく(A>B)かつBよりCが大きい(C>B)、或いはAよりBが大きく(A<B)かつCよりBが大きい(B>C)、即ちAとBとを結ぶ直線の傾きと、BとCとを結ぶ直線の傾きが逆である。
(3)BとCとの差の絶対値がAの絶対値の2倍よりも大きい(|B−C|>2|A|)
6 インパルスノイズ抑制回路
8 開閉スイッチ
Claims (4)
- 誤り検出ビットが付加されたディジタルオーディオデータが入力され、このディジタルオーディオデータの誤りを検出する誤り検出手段と、
前記ディジタルオーディオデータが入力され、前記誤り検出手段が誤りを検出したとき、所定時間にわたって作動し、この作動中でもインパルスノイズが不存在のとき、信号補正を行わないインパルスノイズ除去手段とを、
具備するインパルスノイズ抑制装置。 - 請求項1記載のインパルスノイズ抑制装置において、前記インパルスノイズ除去手段は、入力されたディジタルオーディオデータのレベルが、このデータの前後に入力されたディジタルオーディオデータのレベルより突出しているとき、前記入力されたディジタルオーディオデータを、これの前後に入力されたディジタルオーディオデータの一方に置換するインパルスノイズ抑制装置。
- 請求項1記載のインパルスノイズ抑制装置において、前記ディジタルオーディオデータは、無線伝送路を伝送されたディジタル変調信号から復調されたものであるインパルスノイズ抑制装置。
- 請求項1記載のインパルスノイズ抑制装置において、前記誤り検出手段は、誤りが検出されたとき、前記ディジタルオーディオデータの訂正を行うインパルスノイズ抑制装置。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001311148 | 2001-10-09 | ||
JP2001311148 | 2001-10-09 | ||
PCT/JP2002/010428 WO2003032560A1 (fr) | 2001-10-09 | 2002-10-08 | Dispositif suppresseur de bruit d'impulsion |
Publications (2)
Publication Number | Publication Date |
---|---|
JPWO2003032560A1 JPWO2003032560A1 (ja) | 2005-01-27 |
JP3990357B2 true JP3990357B2 (ja) | 2007-10-10 |
Family
ID=19130021
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2003535398A Expired - Fee Related JP3990357B2 (ja) | 2001-10-09 | 2002-10-08 | インパルスノイズ抑制装置 |
Country Status (8)
Country | Link |
---|---|
US (1) | US7430255B2 (ja) |
EP (1) | EP1441460B1 (ja) |
JP (1) | JP3990357B2 (ja) |
CN (1) | CN1305246C (ja) |
AT (1) | ATE397813T1 (ja) |
DE (1) | DE60226991D1 (ja) |
TW (1) | TW589802B (ja) |
WO (1) | WO2003032560A1 (ja) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7796705B2 (en) | 2004-10-15 | 2010-09-14 | Aware, Inc. | DMT symbol repetition in the presence of impulse noise |
TWI291811B (en) * | 2005-11-25 | 2007-12-21 | Sunplus Technology Co Ltd | Method for suppressing impulse noise and device thereof |
US7835468B2 (en) * | 2006-03-13 | 2010-11-16 | Silicon Laboratories, Inc. | Impulse detection and reduction in a frequency modulation radio receiver |
JP5000936B2 (ja) * | 2006-06-27 | 2012-08-15 | オンセミコンダクター・トレーディング・リミテッド | マルチパスノイズ検出装置及びfm受信装置 |
CN101179283B (zh) * | 2007-09-28 | 2011-01-12 | 杭州国芯科技股份有限公司 | 脉冲噪声的检测及抑制方法 |
US8812309B2 (en) | 2008-03-18 | 2014-08-19 | Qualcomm Incorporated | Methods and apparatus for suppressing ambient noise using multiple audio signals |
JP5059677B2 (ja) * | 2008-04-18 | 2012-10-24 | ルネサスエレクトロニクス株式会社 | ノイズ除去装置、及びノイズ除去方法 |
CN101477801B (zh) * | 2009-01-22 | 2012-01-04 | 东华大学 | 一种检测和消除数字音频信号中脉冲噪声的方法 |
AU2014342700B2 (en) * | 2013-10-28 | 2016-12-22 | 3M Innovative Properties Company | Adaptive frequency response, adaptive automatic level control and handling radio communications for a hearing protector |
US10152960B2 (en) * | 2015-09-22 | 2018-12-11 | Cirrus Logic, Inc. | Systems and methods for distributed adaptive noise cancellation |
US11935546B2 (en) | 2021-08-19 | 2024-03-19 | Semiconductor Components Industries, Llc | Transmission error robust ADPCM compressor with enhanced response |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3374435A (en) * | 1965-07-29 | 1968-03-19 | Bell Telephone Labor Inc | Reduction of the effect of impulse noise bursts |
US4143333A (en) * | 1977-05-16 | 1979-03-06 | David P. Misunas | Impulse noise removing apparatus |
JPS62132434A (ja) * | 1985-12-05 | 1987-06-15 | Clarion Co Ltd | ゲ−ト回路 |
US5210518A (en) * | 1991-05-10 | 1993-05-11 | Echelon Corporation | Apparatus and method for reducing errors in data caused by noise |
JPH0787001A (ja) * | 1993-06-22 | 1995-03-31 | Casio Comput Co Ltd | ディジタル無線携帯端末装置 |
JPH09139980A (ja) | 1995-11-15 | 1997-05-27 | Sony Corp | 受信装置 |
JP2000196568A (ja) | 1998-12-25 | 2000-07-14 | Kyocera Corp | Adpcm補正方式 |
-
2002
- 2002-10-03 TW TW091122854A patent/TW589802B/zh not_active IP Right Cessation
- 2002-10-08 AT AT02800788T patent/ATE397813T1/de not_active IP Right Cessation
- 2002-10-08 CN CNB028200489A patent/CN1305246C/zh not_active Expired - Fee Related
- 2002-10-08 EP EP02800788A patent/EP1441460B1/en not_active Expired - Lifetime
- 2002-10-08 JP JP2003535398A patent/JP3990357B2/ja not_active Expired - Fee Related
- 2002-10-08 DE DE60226991T patent/DE60226991D1/de not_active Expired - Lifetime
- 2002-10-08 WO PCT/JP2002/010428 patent/WO2003032560A1/ja active IP Right Grant
- 2002-10-08 US US10/491,821 patent/US7430255B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPWO2003032560A1 (ja) | 2005-01-27 |
EP1441460A1 (en) | 2004-07-28 |
WO2003032560A1 (fr) | 2003-04-17 |
EP1441460A4 (en) | 2007-05-02 |
TW589802B (en) | 2004-06-01 |
EP1441460B1 (en) | 2008-06-04 |
CN1568595A (zh) | 2005-01-19 |
US7430255B2 (en) | 2008-09-30 |
CN1305246C (zh) | 2007-03-14 |
US20040247060A1 (en) | 2004-12-09 |
ATE397813T1 (de) | 2008-06-15 |
DE60226991D1 (de) | 2008-07-17 |
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