This article introduces the basic principle of radar narrow band doppler filters, puts up the designing method of the hardware circuit and analyzes the filter accuracy.

介绍了采用数字方法实现雷达窄带多普勒滤波器组的基本原理，给出了硬件电路的设计方法，并对滤波器精度进行了分析。

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The purpose of the SSCS is to convey narrow-band calls consisting of voice, voiceband data, or circuit mode data.

SSCS的目的在于传递由语音、语音带宽数据或电路模式数据构成的窄带呼叫。

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The narrow quoting band being discussed would fall within the circuit breaker limits put in place last month that suspend trading in a stock that moves 10% or more from its price.

FORBES: SEC Takes Aim at Wild Market Swings