说明：This function alculates Fourier Amplitude spectra of the time series of uncorrected acceleration and velocity depending on the FFTformat argument and produce a plot.Visual inspection of the fas is helpful for setting a low cut frequency in filter design and implementation.

说明：To investigate the effects of the discrete Fourier transform parameters on the frequency spectra of discrete-time signals.

说明：About UWB A co-basis is a special orthonormal basis, of the Hilbert function space, whose base functions are shape-invariant to Fourier transform except for phase shifts known a priori. A notable advantage of the co-basis orthonormal-expansion method lies in that it essentially conceals the difference between time- and frequency-domains expansions, such that expanding the UWB spectra (frequency domain) is almost equivalent to expanding the pulse shapes (time domain), making the designing task significantly simple. This paper highlights this advantages through tutorial examples on the design of UWB pulses with DAA functionality that meets Korea spectrum regulations.

说明：Fourier Spectra for Face Recognition