... carbon monoxide filter 一氧化碳过滤器 carrier filter 载波滤波器 carrier transfer filter 载波传输滤波器 ...
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... 载波偏置：carrier offset 载波滤波器：carrier-suppression filter 载波空气：carrier air ...
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可是，对于载波频率不断变化的CW脉冲信号，普通的滤波器难以实现窄带跟踪滤波，而宽带滤波又不能达到提高信噪比的要求。
But to the CW pulse signal with changing carrier wave frequency, common filter cannot achieve narrowband filter, whereas broadband filter cannot reach the request of the signal-noise ratio.
对数字载波的频率及频谱成形滤波器的特性参数的选择提出了建议。
The author also makes some Suggestions for frequency selection of digital carrier and parameters selection of spectrum shaping filter.
由于有锁频环的频率牵引，锁相环路滤波器可以设计得很窄，具有很好的抑噪性能，满足精确跟踪载波相位的要求。
Due to the frequency pulling of FLL, the passband of the filter in PLL can be made very narrow to suppress the noise, and the PLL can lock carrier's phase with high accuracy.
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