LUO Li-chun. Improvement and Spectrum Inversion for Zoom-FFT and It’s Time-Frequency Localization Functions[J]. Acta Electronica Sinica, 2006, 34(1): 77-82.
LUO Li-chun. Improvement and Spectrum Inversion for Zoom-FFT and It’s Time-Frequency Localization Functions[J]. Acta Electronica Sinica, 2006, 34(1): 77-82.DOI:
which is for continues sections of signal sequence
is reviewed.A novel method for Zoom-FFT
which is used for disconnected sections of signal sequence noted as R
ms
<1
is offered.The algorithm and the computing cost of it are discussed.A formula for the spectrum inversion form a Zoom-FFT spectrum under onto the practical spectrum from which the former is imaged is established and proved.Examples of application of Zoom-FFT for hopping-frequency signals in HF band and inversion of the Zoom-FFT spectrum of disconnected sections of six-tone signals in voice band are offered.The new Zoom-FFT method will be useful for resolving the contradiction between quickly searching for signals and
precisely analyzing signals in practical engineering.The time-frequency localization function of Zoom-FFT