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1. (WO2007011010) ACTIVE NOISE REDUCTION DEVICE
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2007/011010 International Application No.: PCT/JP2006/314450
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)
大西 将秀 ONISHI, Masahide; null (UsOnly)
中村 由男 NAKAMURA, Yoshio; null (UsOnly)
吉田 茂樹 YOSHIDA, Shigeki; null (UsOnly)
Inventors:
大西 将秀 ONISHI, Masahide; null
中村 由男 NAKAMURA, Yoshio; 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:
2005-21092121.07.2005JP
Title (EN) ACTIVE NOISE REDUCTION DEVICE
(FR) DISPOSITIF DE RÉDUCTION ACTIVE DU BRUIT
(JA) 能動騒音低減装置
Abstract:
(EN) In transmission gain characteristic from a first speaker (30) and a second speaker (31) as second noise generation units to a microphone (32) as a residual signal detection unit, a speaker affected less by level lowering and dip and its frequency band are stored in a switching frequency storage unit (11). According to a current noise frequency calculated by a frequency calculation unit (33) according to an rpm of an engine (1), the first speaker (30) or the second speaker (31) is selected by an output switching unit (9). With this configuration, even when level lowering and dip are generated in the transmission gain characteristic from the speakers to the microphone, it is possible to perform a stable adaptive operation and suppress generation of an abnormal sound by divergence and a distorted sound by an excessive output, thereby obtaining an ideal noise reduction effect.
(FR) Selon la présente invention, pour une caractéristique de gain de transmission d’un premier haut-parleur (30) et d’un second haut-parleur (31) en tant que secondes unités génératrices de bruit à un microphone (32) en tant qu’unité détectrice de signal résiduel, un haut-parleur moins sujet à une baisse de niveau et une inflexion et sa bande de fréquence sont enregistrés dans une unité de stockage de fréquence de commutation (11). Selon une fréquence de bruit de courant déterminée par une unité de calcul de fréquence (33) en fonction de la vitesse d’un moteur (1), le premier haut-parleur (30) ou le second (31) est sélectionné par une unité de commutation de sortie (9). Cette configuration permet, même si une baisse de niveau et une inflexion sont produites dans la caractéristique de gain de transmission des haut-parleurs au microphone, d’effectuer une adaptation stable et d’éliminer la génération d’un son anormal par divergence et d’un son déformé par sortie excessive, d’où l’obtention d’un effet de réduction de bruit idéal.
(JA)  2次騒音発生部としての第1のスピーカ(30)及び第2のスピーカ(31)から残留信号検出部としてのマイクロフォン(32)までの間の伝達利得特性において、レベル低下やディップの影響がより少ない方のスピーカとその周波数帯域を切り替え周波数記憶部(11)に記憶させ、エンジン(1)の回転数に基づいて周波数算出部(33)で算出した現在の騒音の周波数に応じて、適宜第1のスピーカ(30)及び第2のスピーカ(31)を出力切り替え器(9)で択一的に切り替える。このような構成により、スピーカからマイクロフォンまでの伝達利得特性にレベル低下やディップが生じている場合でも、安定的な適応動作ができるとともに、発散による異常音や過大出力による歪音の発生を抑制して理想的な騒音低減効果を得る。
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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, JP, 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:
EP1906384US20090279710JP4513810CN101040320