公开(公告)号：US4057756A

公开(公告)日：1977-11-08

申请号：US671883

申请日：1976-03-29

申请人： Anthony John Ley ,  Eric Metcalf ,  Michael Cedric Jeffery

发明人： Anthony John Ley ,  Eric Metcalf ,  Michael Cedric Jeffery

IPC分类号： G01R23/165 ,  G06F17/15 ,  G01R23/16

CPC分类号： G01R23/165 ,  G06F17/156

摘要： In a spectrum analyzer, the analogue signal to be analyzed is periodically sampled and digitized, and the digit samples are formed into R successive arrays each containing 2N successive samples and each overlapping the previous array by 50%. The forward Fourier transforms of each array are then successively formed, and an array of 2P complex points is formed from the result of each transform, where L-P/2 and L+P/2-1 are the points which represent the upper and lower limits of a Vernier band to be studied in detail and each array extends from points L-P to L+P-1 (i.e. each array is twice the width of the Vernier band, and the Vernier band is symmetrically disposed therein): additionally, each array for which L and R are odd is complemented. The arrays thus formed are then each multiplied by a window function (effectively equivalent to a band pass filter), and the result is subjected to the inverse Fourier transform to form respective further arrays of 2P points. The central points (from P/2 to 3P/2-1) of each of these further arrays are allowed to build up into a continuous array, and the M most recent points, where M is twice the required number of points in the Vernier band, are subjected to the forward Fourier transform to form M complex points, of which the middle points (from M/4 to 3M/4-1) are the desired result.This analyzer has the advantage that the Vernier band can be digitally positioned anywhere in the frequency band covered by the first forward Fourier transform.

摘要翻译： 在频谱分析仪中，要对待分析的模拟信号进行周期性采样和数字化，并将数字样本形成为R个连续的阵列，每个阵列包含2N个连续的样本，并且每个重复先前的阵列50％。 然后连续形成每个阵列的前向傅里叶变换，并根据每个变换的结果形成2P个复数点的阵列，其中LP / 2和L + P / 2-1是表示上下限的点 的游标波段进行详细研究，每个阵列从点LP延伸到L + P-1（即每个阵列是游标波段的宽度的两倍，游标波束对称地设置在其中）：另外，每个阵列 L和R是奇数的是补码的。 然后将由此形成的阵列乘以窗函数（实际上等效于带通滤波器），并且对结果进行傅立叶反变换以形成2P个点的另外的阵列。 允许将这些其他阵列中的每一个的中心点（从P / 2到3P / 2-1）建立成连续的阵列，并且M个最近的点，其中M是游标中所需点数的两倍 进行前向傅里叶变换以形成M个复点，其中点（从M / 4到3M / 4-1）是期望的结果。