发明名称 |
Audio reproducing apparatus |
摘要 |
An audio reproducing apparatus is utilized in noisy environment in which noise level greatly varies. The apparatus includes first and second microphones placed respectively inside and outside a speaker box. Outputs of respective microphones are filtered, and then added with each other so that signals proportional to outside noise can be extracted. A gain of variable gain circuit can be changed with these extracted signals, whereby sound can be reproduced in noisy environments.
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申请公布号 |
US6282296(B1) |
申请公布日期 |
2001.08.28 |
申请号 |
US19990292161 |
申请日期 |
1999.04.15 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
KONNO FUMIYASU;HASEGAWA AKINORI;ONISHI MASAHIDE |
分类号 |
G10K11/178;H03G3/30;H03G3/32;H03G5/16;H04R3/00;(IPC1-7):H04R3/00;H04R29/00 |
主分类号 |
G10K11/178 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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