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公开(公告)号：US4321680A
公开(公告)日：1982-03-23
申请号：US142719
申请日：1980-04-22
CPC分类号： G06F17/141
摘要： A spectrum analyzer for FFT analyzing and displaying the frequency spectrum of a digital signal over a given frequency band (background), as well as over a more limited frequency band (foreground). The spectrum of the signal over each frequency band is calculated and displayed so as to appear on a screen as a simultaneous display. The position of the limited frequency band as well as the width thereof, may be varied.
摘要翻译： 用于FFT分析和显示给定频带（背景）上的数字信号的频谱以及更有限的频带（前景）的频谱分析仪。 计算并显示每个频带上的信号的频谱，以便作为同时显示出现在屏幕上。 有限频带的位置及其宽度可以变化。
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公开(公告)号：US4093989A
公开(公告)日：1978-06-06
申请号：US747053
申请日：1976-12-03
申请人： Joseph H. Flink , John Bertrand
发明人： Joseph H. Flink , John Bertrand
IPC分类号： G01R23/167 , G06F15/34 , G01R23/16
CPC分类号： G01R23/167
摘要： A spectrum analyzer using digital filters for providing third octave spectrum analysis comprises means for breaking up input information into a plurality of digital data blocks, each block being of a given time duration and being within respective frequency ranges, means for weighting the information contained in the data blocks and means for digitally filtering the weighted digital data blocks with digital filtering devices having at least one center frequency falling within the frequency range represented by each of the data blocks, each of the data blocks comprising N samples satisfying the following equation- N >Kf.sub.o/ B.sub.n Where K is a constant which is a function of the sampling rate and the falloff rate of the skirt of filter characteristic, B.sub.n is the filter bandwidth and f.sub.o is the center frequency of the filter.
摘要翻译： 使用用于提供第三倍频程频谱分析的数字滤波器的频谱分析仪包括用于将输入信息分解成多个数字数据块的装置，每个块具有给定的持续时间并且在相应的频率范围内，用于对包含在 数据块和装置，用数字滤波装置数字滤波加权的数字数据块，数字滤波装置具有落在由每个数据块表示的频率范围内的至少一个中心频率，每个数据块包括满足以下等式的N个样本-N> Kfo / Bn其中K是一个常数，它是滤波器特性的裙边的采样率和衰减速率的函数，Bn是滤波器带宽，fo是滤波器的中心频率。
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