具有回声定位机能的蝙蝠以特定的模式发出声音——为每一种蝙蝠所独有——这些声音包含调频（FM,frequency-modulated）信号和恒频（CF,constant-frequency）信号。
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frequency-modulated antenna 调频天线
frequency modulated receiver 调频接收机
frequency modulated oscillations 频率调制振荡
frequency-modulated sonar 调频声纳
frequency modulated altimeter 调频式高度表 ; 调频高度计
frequency modulated system 调频系统
frequency modulated radar 频率调制雷达 ; 调频雷达
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The received signal from target of linear frequency-modulated continues wave (LFMCW) radar is a linear frequency-modulated (LFM) signal.
线性调频连续波雷达对于匀速运动目标的回波经过混频以后还是一个线性调频信号(LFM)。
Based on positioning principle of rotating frequency-modulated disk, designing characteristics of patterns for some-model guided sight instrument are studied.
基于旋转调频调制盘的定位原理，研究了某型号瞄准制导仪中调制盘图案的设计特点。
Frequency of modulated signals is extracted from frequency-modulated signals by using the relationship between the modulus of wavelet transform coefficient and the singular exponent.
利用小波变换系数的模值与信号奇异性指数之间的关系，从调频信号中提取出调制信号的频率。
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