脉冲调频（pulse-frequency modulation），是模拟磁带地震记录的一种方式。把输入的地震波作为调制信号，在磁带上记录下来的地震信号是振幅恒定而频率变化的方波脉冲，脉冲的频率随调制信号的振幅变化而变化。
... pulse-frequency modulating ==> 脉冲频率调制 pulse-frequency modulation ==> 脉冲调频 pulse-frequency NMR flowmeter ==> 脉冲频率核磁共振流量计 ...
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脉冲调频控制系统 [自] pulse frequency modulation control system
脉冲调频遥测术 [自] pulse frequency modulation telemetry
脉冲调频载波 pulsed frequency modulated carrier
脉冲频率调制 PL Pulse Frequency Modulation ; PFM ; pulse-freqnecy modulation ; modulation, pulse frequency
脉冲调频雷达 pulse fm radar
脉冲调频式磁带 pulse frequency modulation magnetic tape record type strong-motion instrument
积分脉冲频率调制 IPFM
高频脉冲调 PHSR
线性调频脉冲放大 chirped pulse amplification
研制一种脉冲调频雷达波形发生器。
A linear or nonlinear pulse FM radar waveform generator was developed successfully.
用单片机作为控制手段，采用脉冲调频（或调宽）方法，达到了较理想的控制品质。
This research is aimed to get higher quality functions by use of single- chip processor and way of pulse frequency modulated (PFM) or pulse width modulated (PWM).
只要恰当地控制粒子束的照射时间，该恒星将有效地成为一台调频电台——以“造父变星”的脉冲为基础载波向宇宙广播。
Time the beam right and the star could be turned, in effect, into an FM transmitter-broadcasting to the universe on the underlying carrier-wave of the Cepheid's pulsation.
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