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1.发明授权Fully digital spectrum analyzer using time compression and discrete fourier transform techniques 失效全数字频谱分析仪采用时间压缩和离散傅里叶变换技术
公开(公告)号：US3881097A
公开(公告)日：1975-04-29
申请号：US36009873
申请日：1973-05-14
发明人： LEHMANN JOSEPH L , LYNCH FRANK
CPC分类号： G06F17/141 , G01R23/00
摘要： A fully digital spectrum analyzer accepting as an input either an analog signal or a series of digital numbers and using time compression and DFT (Discrete Fourier Transform) techniques to provide the spectral component values of the input signal. Novel techniques and means are used in obtaining the power values for selected spectral lines and in averaging these power values. Statistically controlled noise is added to the input of the spectrum analyzer to enhance its resolutin beyond the resolution which would be otherwise available. Advanced and efficient techniques are used for generating and applying trigonometric functions in the course of finding the real and imaginary part of Fourier transforms, and for providing running averages of the power spectra.
摘要翻译： 全数字频谱分析仪接收模拟信号或一系列数字数字的输入，并使用时间压缩和DFT（离散傅里叶变换）技术提供输入信号的频谱分量值。 在获得所选光谱线的功率值和平均这些功率值时使用新的技术和手段。 将统计控制的噪声添加到频谱分析仪的输入端，以增强其解析度，超出分辨率，否则可用。 在找到傅里叶变换的实部和虚部的过程中，使用高级和高效的技术来产生和应用三角函数，并提供功率谱的运行平均值。
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2.发明授权Enhancing resolution in analog-to-digital conversion by adding statistically controlled noise to the analog input signal 失效通过向模拟输入信号添加统计控制噪声来增强模数转换中的分辨率
公开(公告)号：US3877022A
公开(公告)日：1975-04-08
申请号：US36007173
申请日：1973-05-14
发明人： LEHMAN JOSEPH L , LYNCH FRANK
CPC分类号： H03M1/124
摘要： The resolution of analog-to-digital conversion is enhanced by combining the analog input signal, prior to sampling, with a statistically controlled noise signal. The noise signal has a defined probability density function, and its power density spectrum is outside the spectra of the analog input signal and the sampling signal so that none of the noise energy is in the frequency interval of the data of interest following sampling.
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