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单词 noise
释义 noise
1 Any undesired sound. It is measured on a decibel scale ranging from the threshold of hearing (0 dB) to the threshold of pain (130 dB). Between these limits a whisper registers about 20 dB, heavy urban traffic about 90 dB, and a heavy hammer on steel plate about 110 dB. A high noise level (industrial or from overamplified music, for example) can cause permanent hearing impairment.
2 Any unwanted disturbance within a useful frequency band in a communication channel.

Noise: decibel scale
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更新时间:2025/6/23 2:21:03