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Hearing protector
专利权人:
3M Svenska Aktiebolag
发明人:
Nordin, Henrik,Nilsson, Sigvard
申请号:
AU2004292926
公开号:
AU2004292926C1
申请日:
2004.11.23
申请国别(地区):
AU
年份:
2012
代理人:
摘要:
A hearing protector comprises a hearing hood (2), a microphone (7), a loudspeakerand an amplifier. The hearing hood (2) has passive noise damping. The microphone(7) is disposed exteriorly on the hearing protector, while the loudspeaker isdisposed inside the hood. The amplifier amplifies and transmits the signalsfrom the microphone (7) to the loudspeaker. The noise damping of the hearing hood(2) is broad band. The frequency range of the amplifier corresponds to the frequencyrange of human speech. The amplification of the amplifier is variable and thegreatest amplification is such that the sum total of the sound levels that arecaused, on the one hand, by ambient sound passing through the hood (2) and, on theother hand, by sound from the loudspeaker amounts to a maximum, predeterminedvalue.
来源网站:
中国工程科技知识中心
来源网址:
http://www.ckcest.cn/home/

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