将网络接入速度为56Kbps(最大下载速度为8KB/S)及其以下的网络接入方式称为“窄带”，相对于宽带而言窄带的缺点是接入速度慢。
n. tab
misc. narrow-band
Two methods for the single target detection in the narrowband environment are proposed.
第二部分,提出了两种窄带环境下的单目标检测方法。
参考来源 - 宽窄带雷达目标检测与成像技术研究And these methods can not achieve the satisfying effect. It has been proved in the former studies that the human respiration signal which we detected by the UWB bioradar is a kind of vital signs which are narrowband and non-calm.
前期的研究结果表明:超宽谱生物雷达探测到的人体的呼吸信号是一种窄带的具有非平稳特性的生理信号,因此上述人体生理信号识别方法不适用于我们的超宽谱生物雷达。
参考来源 - 基于RQA方法的生物雷达中人体数量识别技术的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
宽带 FM 信号和窄带 CF 信号传输到目标，从目标反射回来，然后返回猎蝠。
The broadband FM signals and the narrowband CF signals travel out to a target, reflect from it, and return to the hunting bat.
天文学家已经发现太阳系边缘围着一条窄带。
The edge of the solar system is tied up with a ribbon, astronomers have discovered.
这张图片是由宽带滤波器和窄带滤波器所拍摄的照片所合成的。
The picture is a composite of images taken through both broad and narrow band filters.
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