DE69533734D1 - Durch Sprachaktivitätsdetektion gesteuerte Rauschunterdrückung - Google Patents

Durch Sprachaktivitätsdetektion gesteuerte Rauschunterdrückung

Info

Publication number
DE69533734D1
DE69533734D1 DE69533734T DE69533734T DE69533734D1 DE 69533734 D1 DE69533734 D1 DE 69533734D1 DE 69533734 T DE69533734 T DE 69533734T DE 69533734 T DE69533734 T DE 69533734T DE 69533734 D1 DE69533734 D1 DE 69533734D1
Authority
DE
Germany
Prior art keywords
noise reduction
voice activity
activity detection
reduction controlled
controlled
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.)
Expired - Lifetime
Application number
DE69533734T
Other languages
English (en)
Other versions
DE69533734T2 (de
Inventor
Thomas John Janiszewski
Michael Charles Recchione
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
AT&T Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by AT&T Corp filed Critical AT&T Corp
Publication of DE69533734D1 publication Critical patent/DE69533734D1/de
Application granted granted Critical
Publication of DE69533734T2 publication Critical patent/DE69533734T2/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/012—Comfort noise or silence coding
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
    • G10L19/08—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
    • G10L19/12—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters the excitation function being a code excitation, e.g. in code excited linear prediction [CELP] vocoders
    • G10L19/135—Vector sum excited linear prediction [VSELP]
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Processing of the speech or voice signal 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
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
    • G10L25/78—Detection of presence or absence of voice signals
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Processing of the speech or voice signal 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
    • G10L21/0216—Noise filtering characterised by the method used for estimating noise
    • G10L2021/02168—Noise filtering characterised by the method used for estimating noise the estimation exclusively taking place during speech pauses
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
    • G10L25/78—Detection of presence or absence of voice signals
    • G10L2025/783—Detection of presence or absence of voice signals based on threshold decision
    • G10L2025/786—Adaptive threshold
DE69533734T 1994-01-28 1995-01-18 Durch Sprachaktivitätsdetektion gesteuerte Rauschunterdrückung Expired - Lifetime DE69533734T2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US188294 1988-04-29
US08/188,294 US5657422A (en) 1994-01-28 1994-01-28 Voice activity detection driven noise remediator

Publications (2)

Publication Number Publication Date
DE69533734D1 true DE69533734D1 (de) 2004-12-09
DE69533734T2 DE69533734T2 (de) 2005-11-03

Family

ID=22692567

Family Applications (2)

Application Number Title Priority Date Filing Date
DE69518174T Expired - Lifetime DE69518174T2 (de) 1994-01-28 1995-01-18 Rauschkorrektur durch Feststellung der Anwesenheit von Sprachsignalen
DE69533734T Expired - Lifetime DE69533734T2 (de) 1994-01-28 1995-01-18 Durch Sprachaktivitätsdetektion gesteuerte Rauschunterdrückung

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DE69518174T Expired - Lifetime DE69518174T2 (de) 1994-01-28 1995-01-18 Rauschkorrektur durch Feststellung der Anwesenheit von Sprachsignalen

Country Status (7)

Country Link
US (1) US5657422A (de)
EP (2) EP0665530B1 (de)
KR (1) KR100367533B1 (de)
CN (1) CN1132988A (de)
CA (1) CA2138818C (de)
DE (2) DE69518174T2 (de)
RU (1) RU2151430C1 (de)

Families Citing this family (93)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997010586A1 (en) * 1995-09-14 1997-03-20 Ericsson Inc. System for adaptively filtering audio signals to enhance speech intelligibility in noisy environmental conditions
US5914827A (en) * 1996-02-28 1999-06-22 Silicon Systems, Inc. Method and apparatus for implementing a noise generator in an integrated circuit disk drive read channel
US6427134B1 (en) * 1996-07-03 2002-07-30 British Telecommunications Public Limited Company Voice activity detector for calculating spectral irregularity measure on the basis of spectral difference measurements
SE507370C2 (sv) * 1996-09-13 1998-05-18 Ericsson Telefon Ab L M Metod och anordning för att alstra komfortbrus i linjärprediktiv talavkodare
FR2758676A1 (fr) * 1997-01-21 1998-07-24 Philips Electronics Nv Methode de reduction des clics dans un systeme de transmission de donnees
US5940439A (en) * 1997-02-26 1999-08-17 Motorola Inc. Method and apparatus for adaptive rate communication system
US5907822A (en) * 1997-04-04 1999-05-25 Lincom Corporation Loss tolerant speech decoder for telecommunications
US6125343A (en) * 1997-05-29 2000-09-26 3Com Corporation System and method for selecting a loudest speaker by comparing average frame gains
FR2768544B1 (fr) * 1997-09-18 1999-11-19 Matra Communication Procede de detection d'activite vocale
US6023674A (en) * 1998-01-23 2000-02-08 Telefonaktiebolaget L M Ericsson Non-parametric voice activity detection
US6182035B1 (en) * 1998-03-26 2001-01-30 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for detecting voice activity
USD419160S (en) * 1998-05-14 2000-01-18 Northrop Grumman Corporation Personal communications unit docking station
US6304559B1 (en) 1998-05-15 2001-10-16 Northrop Grumman Corporation Wireless communications protocol
US6243573B1 (en) 1998-05-15 2001-06-05 Northrop Grumman Corporation Personal communications system
US6223062B1 (en) 1998-05-15 2001-04-24 Northrop Grumann Corporation Communications interface adapter
USD421002S (en) * 1998-05-15 2000-02-22 Northrop Grumman Corporation Personal communications unit handset
US6141426A (en) 1998-05-15 2000-10-31 Northrop Grumman Corporation Voice operated switch for use in high noise environments
US6041243A (en) 1998-05-15 2000-03-21 Northrop Grumman Corporation Personal communications unit
US6169730B1 (en) 1998-05-15 2001-01-02 Northrop Grumman Corporation Wireless communications protocol
TW376611B (en) 1998-05-26 1999-12-11 Koninkl Philips Electronics Nv Transmission system with improved speech encoder
US6157906A (en) * 1998-07-31 2000-12-05 Motorola, Inc. Method for detecting speech in a vocoded signal
US20010014857A1 (en) * 1998-08-14 2001-08-16 Zifei Peter Wang A voice activity detector for packet voice network
US7124079B1 (en) * 1998-11-23 2006-10-17 Telefonaktiebolaget Lm Ericsson (Publ) Speech coding with comfort noise variability feature for increased fidelity
US6556967B1 (en) * 1999-03-12 2003-04-29 The United States Of America As Represented By The National Security Agency Voice activity detector
US6691092B1 (en) * 1999-04-05 2004-02-10 Hughes Electronics Corporation Voicing measure as an estimate of signal periodicity for a frequency domain interpolative speech codec system
AU4072400A (en) * 1999-04-05 2000-10-23 Hughes Electronics Corporation A voicing measure as an estimate of signal periodicity for frequency domain interpolative speech codec system
US6618701B2 (en) 1999-04-19 2003-09-09 Motorola, Inc. Method and system for noise suppression using external voice activity detection
US6633841B1 (en) * 1999-07-29 2003-10-14 Mindspeed Technologies, Inc. Voice activity detection speech coding to accommodate music signals
US6944141B1 (en) * 1999-10-22 2005-09-13 Lucent Technologies Inc. Systems and method for phase multiplexing in assigning frequency channels for a wireless communication network
US7263074B2 (en) * 1999-12-09 2007-08-28 Broadcom Corporation Voice activity detection based on far-end and near-end statistics
DE60143506D1 (de) * 2000-01-27 2011-01-05 Nuance Comm Austria Gmbh Sprachdetektiongsgerät mit zwei abschaltkriterien
JP3929686B2 (ja) * 2000-08-14 2007-06-13 松下電器産業株式会社 音声スイッチング装置およびその方法
US6873604B1 (en) * 2000-07-31 2005-03-29 Cisco Technology, Inc. Method and apparatus for transitioning comfort noise in an IP-based telephony system
AU2001294989A1 (en) * 2000-10-04 2002-04-15 Clarity, L.L.C. Speech detection
US6708147B2 (en) 2001-02-28 2004-03-16 Telefonaktiebolaget Lm Ericsson(Publ) Method and apparatus for providing comfort noise in communication system with discontinuous transmission
US20030028386A1 (en) * 2001-04-02 2003-02-06 Zinser Richard L. Compressed domain universal transcoder
US20030120484A1 (en) * 2001-06-12 2003-06-26 David Wong Method and system for generating colored comfort noise in the absence of silence insertion description packets
US7180881B2 (en) * 2001-09-28 2007-02-20 Interdigital Technology Corporation Burst detector
US20030093270A1 (en) * 2001-11-13 2003-05-15 Domer Steven M. Comfort noise including recorded noise
KR100463657B1 (ko) * 2002-11-30 2004-12-29 삼성전자주식회사 음성구간 검출 장치 및 방법
US7499856B2 (en) * 2002-12-25 2009-03-03 Nippon Telegraph And Telephone Corporation Estimation method and apparatus of overall conversational quality taking into account the interaction between quality factors
TWI233590B (en) * 2003-09-26 2005-06-01 Ind Tech Res Inst Energy feature extraction method for noisy speech recognition
FR2861247B1 (fr) * 2003-10-21 2006-01-27 Cit Alcatel Terminal de telephonie a gestion de la qualite de restituton vocale pendant la reception
JP4490090B2 (ja) * 2003-12-25 2010-06-23 株式会社エヌ・ティ・ティ・ドコモ 有音無音判定装置および有音無音判定方法
JP4601970B2 (ja) * 2004-01-28 2010-12-22 株式会社エヌ・ティ・ティ・ドコモ 有音無音判定装置および有音無音判定方法
ATE343196T1 (de) * 2004-01-22 2006-11-15 Siemens Spa Italiana Sprachaktivitätsdetektion unter vewendung von komprimierten sprachsignal-parametern
US9025638B2 (en) * 2004-06-16 2015-05-05 Telefonaktiebolaget L M Ericsson (Publ) Method and apparatus to compensate for receiver frequency error in noise estimation processing
FI20045315A (fi) * 2004-08-30 2006-03-01 Nokia Corp Ääniaktiivisuuden havaitseminen äänisignaalissa
US20060104460A1 (en) * 2004-11-18 2006-05-18 Motorola, Inc. Adaptive time-based noise suppression
ATE523874T1 (de) 2005-03-24 2011-09-15 Mindspeed Tech Inc Adaptive stimmenmodus-erweiterung für einen stimmenaktivitäts-detektor
US7610197B2 (en) * 2005-08-31 2009-10-27 Motorola, Inc. Method and apparatus for comfort noise generation in speech communication systems
KR100788706B1 (ko) * 2006-11-28 2007-12-26 삼성전자주식회사 광대역 음성 신호의 부호화/복호화 방법
CN101632119B (zh) * 2007-03-05 2012-08-15 艾利森电话股份有限公司 用于对稳态背景噪声进行平滑的方法和设备
PL2118889T3 (pl) * 2007-03-05 2013-03-29 Ericsson Telefon Ab L M Sposób i sterownik do wygładzania stacjonarnego szumu tła
CN101106736B (zh) * 2007-08-15 2010-04-14 河南蓝信科技有限公司 应答器报文读取装置和读取方法
US8554551B2 (en) 2008-01-28 2013-10-08 Qualcomm Incorporated Systems, methods, and apparatus for context replacement by audio level
CN101483042B (zh) 2008-03-20 2011-03-30 华为技术有限公司 一种噪声生成方法以及噪声生成装置
US8275136B2 (en) * 2008-04-25 2012-09-25 Nokia Corporation Electronic device speech enhancement
US8244528B2 (en) 2008-04-25 2012-08-14 Nokia Corporation Method and apparatus for voice activity determination
WO2009130388A1 (en) * 2008-04-25 2009-10-29 Nokia Corporation Calibrating multiple microphones
KR102339297B1 (ko) 2008-11-10 2021-12-14 구글 엘엘씨 멀티센서 음성 검출
ES2371619B1 (es) * 2009-10-08 2012-08-08 Telefónica, S.A. Procedimiento de detección de segmentos de voz.
FR2956539B1 (fr) * 2010-02-16 2012-03-16 Dominique Retali Procede de detection du fonctionnement d'un dispositif de transmission sans fil de signaux de voix.
TWI459828B (zh) * 2010-03-08 2014-11-01 Dolby Lab Licensing Corp 在多頻道音訊中決定語音相關頻道的音量降低比例的方法及系統
US8428759B2 (en) * 2010-03-26 2013-04-23 Google Inc. Predictive pre-recording of audio for voice input
PT2559028E (pt) 2010-04-14 2015-11-18 Voiceage Corp Livro de códigos de inovação combinados flexível e evolutivo a utilizar num codificador e descodificador celp
US8253684B1 (en) 2010-11-02 2012-08-28 Google Inc. Position and orientation determination for a mobile computing device
KR20120080409A (ko) * 2011-01-07 2012-07-17 삼성전자주식회사 잡음 구간 판별에 의한 잡음 추정 장치 및 방법
US8862254B2 (en) * 2011-01-13 2014-10-14 Apple Inc. Background audio processing
CN102136271B (zh) * 2011-02-09 2012-07-04 华为技术有限公司 舒适噪声生成器、方法及回声抵消装置
ES2681429T3 (es) * 2011-02-14 2018-09-13 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Generación de ruido en códecs de audio
BR112013020482B1 (pt) 2011-02-14 2021-02-23 Fraunhofer Ges Forschung aparelho e método para processar um sinal de áudio decodificado em um domínio espectral
AR085361A1 (es) 2011-02-14 2013-09-25 Fraunhofer Ges Forschung Codificacion y decodificacion de posiciones de los pulsos de las pistas de una señal de audio
BR112013020324B8 (pt) 2011-02-14 2022-02-08 Fraunhofer Ges Forschung Aparelho e método para supressão de erro em fala unificada de baixo atraso e codificação de áudio
ES2623291T3 (es) 2011-02-14 2017-07-10 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Codificación de una porción de una señal de audio utilizando una detección de transitorios y un resultado de calidad
ES2458436T3 (es) 2011-02-14 2014-05-05 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Representación de señal de información utilizando transformada superpuesta
ES2534972T3 (es) 2011-02-14 2015-04-30 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Predicción lineal basada en esquema de codificación utilizando conformación de ruido de dominio espectral
US9640190B2 (en) * 2012-08-29 2017-05-02 Nippon Telegraph And Telephone Corporation Decoding method, decoding apparatus, program, and recording medium therefor
CA2948015C (en) 2012-12-21 2018-03-20 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Comfort noise addition for modeling background noise at low bit-rates
AU2013366642B2 (en) 2012-12-21 2016-09-22 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Generation of a comfort noise with high spectro-temporal resolution in discontinuous transmission of audio signals
US9275638B2 (en) * 2013-03-12 2016-03-01 Google Technology Holdings LLC Method and apparatus for training a voice recognition model database
CN105830154B (zh) * 2013-12-19 2019-06-28 瑞典爱立信有限公司 估计音频信号中的背景噪声
US9972334B2 (en) 2015-09-10 2018-05-15 Qualcomm Incorporated Decoder audio classification
US9654861B1 (en) 2015-11-13 2017-05-16 Doppler Labs, Inc. Annoyance noise suppression
US9589574B1 (en) * 2015-11-13 2017-03-07 Doppler Labs, Inc. Annoyance noise suppression
CN105913854B (zh) * 2016-04-15 2020-10-23 腾讯科技（深圳）有限公司 语音信号级联处理方法和装置
CN106292827B (zh) * 2016-08-18 2018-09-21 华为技术有限公司 一种电压产生装置及半导体芯片
RU2651803C1 (ru) * 2016-12-22 2018-04-24 Акционерное общество "Научно-производственное предприятие "Полет" Подавитель шума
US10157627B1 (en) 2017-06-02 2018-12-18 Bose Corporation Dynamic spectral filtering
KR102629385B1 (ko) * 2018-01-25 2024-01-25 삼성전자주식회사 바지-인 관련 직접 경로를 지원하는 저전력 보이스 트리거 시스템을 포함하는 애플리케이션 프로세서, 이를 포함하는 전자 장치 및 그 동작 방법
KR20210031265A (ko) * 2019-09-11 2021-03-19 삼성전자주식회사 전자 장치 및 그 동작방법
RU2742720C1 (ru) * 2019-12-20 2021-02-10 Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский университет "Московский институт электронной техники" Устройство для защиты конфиденциальных переговоров
US20220417659A1 (en) * 2021-06-23 2022-12-29 Comcast Cable Communications, Llc Systems, methods, and devices for audio correction

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4061875A (en) * 1977-02-22 1977-12-06 Stephen Freifeld Audio processor for use in high noise environments
US4720802A (en) * 1983-07-26 1988-01-19 Lear Siegler Noise compensation arrangement
DE3689035T2 (de) * 1985-07-01 1994-01-20 Motorola Inc Rauschminderungssystem.
US5276765A (en) * 1988-03-11 1994-01-04 British Telecommunications Public Limited Company Voice activity detection
US4864561A (en) * 1988-06-20 1989-09-05 American Telephone And Telegraph Company Technique for improved subjective performance in a communication system using attenuated noise-fill
GB2256351B (en) * 1991-05-25 1995-07-05 Motorola Inc Enhancement of echo return loss
JP2518765B2 (ja) * 1991-05-31 1996-07-31 国際電気株式会社 音声符号化通信方式及びその装置
US5410632A (en) * 1991-12-23 1995-04-25 Motorola, Inc. Variable hangover time in a voice activity detector
US5285502A (en) * 1992-03-31 1994-02-08 Auditory System Technologies, Inc. Aid to hearing speech in a noisy environment
US5459814A (en) * 1993-03-26 1995-10-17 Hughes Aircraft Company Voice activity detector for speech signals in variable background noise

Also Published As

Publication number Publication date
EP0665530A1 (de) 1995-08-02
US5657422A (en) 1997-08-12
EP1017042B1 (de) 2004-11-03
KR950035167A (ko) 1995-12-30
CN1132988A (zh) 1996-10-09
EP0665530B1 (de) 2000-08-02
EP1017042A1 (de) 2000-07-05
KR100367533B1 (ko) 2003-04-07
RU95101029A (ru) 1996-11-10
CA2138818C (en) 1999-05-11
DE69518174T2 (de) 2001-05-31
RU2151430C1 (ru) 2000-06-20
DE69518174D1 (de) 2000-09-07
DE69533734T2 (de) 2005-11-03
CA2138818A1 (en) 1995-07-29

Similar Documents

Publication Publication Date Title
DE69533734D1 (de) Durch Sprachaktivitätsdetektion gesteuerte Rauschunterdrückung
DE69230767T2 (de) Geräuschverminderungsmikrophonapparat
FI920649A0 (fi) Kohinan vaimennusjärjestelmä puhesignaaleille
DE69420027T2 (de) Rauschverminderung
DE69838266D1 (de) Akustische Geräuschverminderung
DE69721347D1 (de) Sprachaktivitätserkennung
DE69319783D1 (de) Geräuschminderungssystem
NO973756D0 (no) Deteksjon av stemmeaktivitet
FI973142A0 (fi) Spektraalisesti vähentävä kohinan vaimennusmenetelmä
DE69417216D1 (de) Rauschreduktion
DE69328987D1 (de) Rauschreduktionsvorrichtung
KR950012722U (ko) 노이즈 필터
DE69624225T2 (de) Gerichtete adaptive geräuschreduktion
DE59501088D1 (de) Schallabsorber
DE69318009D1 (de) Aktive rauschunterdrückung
DE69316938D1 (de) Rauschverminderungsvorrichtung
DE69511267T2 (de) Sprachprocessor
DE69228951T2 (de) Geräuschunterdrückungssystem
DE69615129D1 (de) Rauschdämfersystem
KR970019370U (ko) 음향가이드베인에 의한 소음저감장치
KR970010035U (ko) 차량의 소음저감용메인 사일렌서
KR970010528U (ko) 가습기의 소음 감소장치
DE9407342U1 (de) Diktiergerät
KR950014433U (ko) 소음 감소용 레일구조체
KR970028660U (ko) 소음 감소장치

Legal Events

Date Code Title Description
8364 No opposition during term of opposition