第二章 系统原理 RFID系统原理 7 2-2 RFID读取器 低频（ 低频（Low Frequency LF）读取器 ） 频率范围介于30300kHz之间，主要频率为125 KHz 或134KHz，此类系统的资料传输量较低， 其主要应用领域为动物标签、大楼...
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lf low frequency 低频 ; 高音 ; 低音
The ratio of the low frequency to high frequency components in HRV power spectrum(LF/HF) fluctuates with the change in the sleep stages.
HRV频谱中低频和高频成分的比值（LF/HF）随着睡眠深度的变化而波动。
In terms of operation frequency, RFID systems can be divided into four categories: low frequency (LF), high frequency (HF), ultra high frequency (UHF), and microwave.
根据工作频率来分，RFID系统可以分为低频，高频，超高频和微波四个波段。
The 18 "low frequency driver combines 95 dB sensitivity with 1000 Watts (continuous) power handling, to deliver LF sound pressure levels well beyond those typical of systems its size."
在18“低频驱动器结合95分贝100 0瓦灵敏度(连续)功率处理能力，能够提供远远超过低频声压水平的典型系统的大小。”
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