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1. (WO2007011011) ACTIVE NOISE REDUCTION DEVICE
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2007/011011 International Application No.: PCT/JP2006/314451
Publication Date: 25.01.2007 International Filing Date: 21.07.2006
IPC:
G10K 11/178 (2006.01) ,B60R 11/02 (2006.01)
G PHYSICS
10
MUSICAL INSTRUMENTS; ACOUSTICS
K
SOUND-PRODUCING DEVICES;  METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
11
Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
16
Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
175
using interference effects; Masking sound
178
by electro-acoustically regenerating the original acoustic waves in anti-phase
B PERFORMING OPERATIONS; TRANSPORTING
60
VEHICLES IN GENERAL
R
VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
11
Arrangements for holding or mounting articles, not otherwise provided for
02
for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
Applicants:
松下電器産業株式会社 MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. [JP/JP]; 〒5718501 大阪府門真市大字門真1006番地 Osaka 1006, Oaza Kadoma, Kadoma-shi, Osaka 5718501, JP (AllExceptUS)
中村 由男 NAKAMURA, Yoshio; null (UsOnly)
大西 将秀 ONISHI, Masahide; null (UsOnly)
吉田 茂樹 YOSHIDA, Shigeki; null (UsOnly)
Inventors:
中村 由男 NAKAMURA, Yoshio; null
大西 将秀 ONISHI, Masahide; null
吉田 茂樹 YOSHIDA, Shigeki; null
Agent:
岩橋 文雄 IWAHASHI, Fumio; 〒5718501 大阪府門真市大字門真1006番地 松下電器産業株式会社内 Osaka c/o Matsushita Electric Industrial Co., Ltd. 1006, Oaza Kadoma Kadoma-shi, Osaka 5718501, JP
Priority Data:
2005-21092021.07.2005JP
Title (EN) ACTIVE NOISE REDUCTION DEVICE
(FR) DISPOSITIF DE RÉDUCTION ACTIVE DU BRUIT
(JA) 能動騒音低減装置
Abstract:
(EN) An active noise reduction device includes: a singe wave generation unit (102) for generating a sine wave of a particular frequency; a cosine wave generation unit (103) for generating a cosine wave of the same frequency as the sine wave; two one-tap digital filters (104, 105) for processing outputs of the sine wave generation unit (102) and the cosine wave generation unit (103); a processing circuit (101) having two coefficient update units (106, 107) for updating the coefficients of the two one-tap digital filters (104, 105); and an adjusting circuit (108) for adjusting a phase and an amplitude of the output from the processing circuit (101). The two coefficient modification units update coefficients of the two one-tap digital filters (104, 105) according to the sum of the outputs of the two one-tap digital filters (104, 105) and the sum of the inputs as the output and the outputs of sine wave generation unit and the cosine wave generation unit. The adjusting circuit (108) generates a control signal of reverse phase with respect to the original noise. With this configuration, it is possible to provide a low-cost highly practical active noise reduction device for reducing a random noise such as a road noise.
(FR) La présente invention concerne un dispositif de réduction active du bruit comprenant : une unité de génération d’onde sinusoïdale (102) qui génère une onde sinusoïdale d’une certaine fréquence, une unité de génération d’onde cosinusoïdale (103) qui génère une onde cosinusoïdale de la même fréquence que l’onde sinusoïdale, deux filtres numériques à dérivation (104, 105) destinés au traitement des sorties de la première unité (102) et de la seconde (103) ; un circuit de traitement (101) comprenant deux unités de mise à jour de coefficients (106, 107) qui mettent à jour les coefficients des deux filtres numériques (104, 105) ; et un circuit de réglage (108) qui règle une phase et une amplitude de la sortie du circuit de traitement (101). Les deux unités de mise à jour de coefficients mettent à jour les coefficients des deux filtres numériques à dérivation (104, 105) selon la somme de leurs sorties et la somme des entrées en tant que sortie et les sorties des unités de génération d’onde sinusoïdale et d’onde cosinusoïdale. Le circuit de réglage (108) génère un signal de commande de phase inverse par rapport au bruit d’origine. Cette configuration permet d’obtenir un dispositif de réduction active du bruit économique et très pratique qui réduit un bruit aléatoire tel qu’un bruit de la route.
(JA)  特定の周波数の正弦波を生成する正弦波生成部(102)と同一の周波数の余弦波を生成する余弦波生成部(103)と、それらの出力を処理する2つの1タップデジタルフィルタ(104)、(105)からの出力を加算したものを出力とし、この出力と入力とを加算したものと正弦波生成部(102)及び余弦波生成部(103)からの出力とで2つの1タップデジタルフィルタ(104)、(105)のそれぞれの係数を更新する2つの係数更新部(106)、(107)を持った処理回路(101)と、この処理回路(101)からの前記出力の位相、振幅を調整する調整回路(108)によりもとの騒音と逆位相の制御信号を発生させる。このような構成により、ロードノイズのようなランダムな騒音を低減するための能動騒音低減装置として、低コストで実用性の高い能動騒音低減装置を提供する。
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Designated States: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BW, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, HN, HR, HU, ID, IL, IN, IS, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LV, LY, MA, MD, MG, MK, MN, MW, MX, MZ, NA, NG, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SK, SL, SM, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IS, IT, LT, LU, LV, MC, NL, PL, PT, RO, SE, SI, SK, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG)
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)
Also published as:
EP1772852US20080310650CN101040321