A High Precision Spectrum Rectifying Technique
Author(s)
J. Zhou & Y. Zhong
Abstract
Spectrum-analysis technology has been widely used in engineering. Round
discrete spectrum or FFT spectrum of a signal can be obtained rapidly by the
FFT method. In practical applications, these FFT spectrums always need to be
rectified in order to obtain a better spectrum. A high precision spectrum
rectifying technique, a deconvolution-based spectrum rectifying technique, is
developed in this paper. The sampled signal is firstly multiplied by an adaptive
window function, the zooming spectrum of discrete windowed signal is then
calculated, and finally the spectrum of window function is eliminated from the
zooming spectrum by deconvolution so that the rectified spectrum of the
analyzed signal can be obtained. Experiments show that this rectifying technique
is very effective.
Keywords: spectrum rectifying technique, deconvolution, window function,
sidepetal error.
1 Introduction
Frequency spectrum analysis technology has many applications in engineering
[1]. FFT is frequently used to obtain signal spectrum rapidly. But the FFT
spectrum with low resolution and sidepetal error caused by truncation is too
rough to satisfy engineering demands. It induces the study on spectrum
rectifying started from 1970s of the 20th century and many achievements have
been made [2-4]. One of which is window function spectrum rectifying
technique that decreases the sidepetal error by selecting a narrow-band window
function. However, so far the rectified spectrum generated by this method is still
Keywords
spectrum rectifying technique, deconvolution, window function,
sidepetal error.
Related Book
Other papers in this volume
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