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2. 发明授权

US5499301A Active noise cancelling apparatus 失效
标题翻译：有源噪声消除装置
公开(公告)号：US5499301A
公开(公告)日：1996-03-12
申请号：US323730
申请日：1994-10-20
申请人： Yuko Sudo , Susumu Saruta , Yasuyuki Sekiguchi
发明人： Yuko Sudo , Susumu Saruta , Yasuyuki Sekiguchi
IPC分类号： F01N1/06 , G10K11/16 , G10K11/178 , H03H21/00
CPC分类号： G10K11/1784 , G10K2210/104 , G10K2210/1054 , G10K2210/109 , G10K2210/121 , G10K2210/3032 , G10K2210/3045
摘要： An active noise cancelling apparatus for actively controlling noise generated by a compressor, where noise is apt to externally leak from an opening portion of a machine chamber storing the compressor driven by an A.C. power supply. The active noise cancelling apparatus includes: a microphone, provided in the vicinity of the opening portion, for detecting noise generated by the compressor; fundamental wave component extracting portion for extracting a fundamental wave component of rotation frequency of the compressor, from a sound signal of the noise detected by the microphone; periodic signal generating circuit for a periodic signal correlative to the fundamental wave component extracted by the fundamental wave component extracting portion; periodic signal outputting circuit for outputting a predetermined periodic signal by means of comparing a phase of the periodic signal generated by the periodic signal generating circuit with a phase of the fundamental wave component; uncancelled sound extracting portion for extracting noise having been not cancelled, excluding the fundamental wave component; sound source waveform generating circuit for forming a harmonics component from the signal outputted by the fundamental wave component extracting circuit; control signal generating circuit for correcting a control signal outputted from the sound source waveform generating circuit, based on a signal from the uncancelled sound extracting portion and for generating the corrected signal in a feedback manner; and a loudspeaker for outputting the control signal generated from the control signal correcting circuit.
摘要翻译：一种主动噪声消除装置，用于主动地控制由压缩机产生的噪声，其中噪声易于从存储由交流电源驱动的压缩机的机器室的开口部分泄漏。有源噪声消除装置包括：麦克风，设置在开口部分附近，用于检测压缩机产生的噪声; 基波分量提取部分，用于从由麦克风检测到的噪声的声音信号中提取压缩机的旋转频率的基波分量; 周期信号发生电路，用于与由基波分量提取部分提取的基波分量相关的周期信号; 周期信号输出电路，用于通过将周期信号发生电路产生的周期信号的相位与基波分量的相位进行比较来输出预定的周期信号; 不包括基波分量的用于提取未被消除的噪声的未通知声音提取部分; 声源波形发生电路，用于根据由基波分量提取电路输出的信号形成谐波分量; 控制信号发生电路，用于根据来自未经声音提取部分的信号校正从声源波形发生电路输出的控制信号，并以反馈方式产生校正信号; 以及用于输出从控制信号校正电路产生的控制信号的扬声器。

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