直接调频是用调制信号直接控制振荡器的振荡频率，使其不失真地反映调制信号的变化规律。
... 直接耦合放大器 direct-coupled amplifier 直接调频 direct frequency modulation 直接序列扩频 direct sequence spread spectrum (ds) ...
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电路中还首次采用了微波晶体直接调频方案。
The directive FM version of microwave crystal in circuit is used at the f...
分析了调频定距引信中采用变容二极管直接调频时调制的非线性及其对定距精度的影响。
Gives an analysis on the non linearity in frequency modulation when a varactor modulates directly in a FM ranging fuze, and shows its influence on the precision of ranging.
传感器利用注入结电流直接调频的半导体激光(LD)产生外差干涉，从而实现了干涉相位的线性检测。
A heterodyne interference is caused by a frequency modulation of a laser diode (LD) with a ramp injection current, and a linear phase detection is realized.
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