发明名称 |
Active noise cancellation apparatus in MRI apparatus |
摘要 |
An active noise cancellation apparatus of an MRI apparatus, including a detector for detecting vibration of a bobbin or a driving signal of a magnetism generator as a noise source signal, error signal detectors for detecting actual noise near the ears of a patient, a circuit for generating a noise cancellation signal having an opposite phase to a phase of a noise signal generated by an MRI apparatus and having an amplitude proportional to the output of the error signal detectors, from the detected noise source signal and the output of the error signal detectors, and a sound generator for generating a sound wave by the noise cancellation signal.
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申请公布号 |
US5427102(A) |
申请公布日期 |
1995.06.27 |
申请号 |
US19940331156 |
申请日期 |
1994.10.28 |
申请人 |
HITACHI, LTD. |
发明人 |
SHIMODE, SHIN'ICHI;INOUYE, HIROSHI;SAHO, NORIHIDE;OKABE, SHINYA;OTSUKA, MASAYUKI;IWASE, YUKIJI;YAMAMOTO, ETSUJI;SHIONO, HIDEMI;TAKIGUCHI, KENJI |
分类号 |
A61B5/055;G01N33/38;G01R33/28;G01R33/385;G01R33/54;G10K11/178;H04R1/40;H04R3/00;(IPC1-7):A61B5/055;H04B15/00 |
主分类号 |
A61B5/055 |
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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