One reason this is hard is that radio telescopes must chop the spectrum into fine portions to study it, like tuning into a signal on a car radio.
研究工作进展困难的一个原因是，正如汽车收音机的调频一般，射电望远镜必须把光谱按照波段分成易于研究的片段。
A new type electrically tunable bandpass filter was designed, how to control the filter tuning by digital signal was investigated.
设计了一种新型电调谐带通滤波器，研究了数字信号控制滤波器电调谐的技术。
The dependences of peak amplitude and temporal characteristic of pulsed photothermal spectroscopy signal on wavelength tuning are discussed.
讨论了波长调谐对脉冲光热光谱信号的峰值和时间特性的影响。
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