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FFT Spectrum Analyzer using Goertzel Filter

N. Kalaiarasi, Sahitya Bhoumik Published in Signal Processing

International Journal of Applied Information Systems
Year of Publication 2012
© 2010 by IJAIS Journal
10.5120/ijais12-450706
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  1. N Kalaiarasi and Sahitya Bhoumik. Article: FFT Spectrum Analyzer using Goertzel Filter. International Journal of Applied Information Systems 4(5):20-24, October 2012. BibTeX

    @article{key:article,
    	author = "N. Kalaiarasi and Sahitya Bhoumik",
    	title = "Article: FFT Spectrum Analyzer using Goertzel Filter",
    	journal = "International Journal of Applied Information Systems",
    	year = 2012,
    	volume = 4,
    	number = 5,
    	pages = "20-24",
    	month = "October",
    	note = "Published by Foundation of Computer Science, New York, USA"
    }
    

Abstract

In this paper, the implementation of DSP algorithms on FPGA devices are taken into consideration and the FFT spectral analysis as a real time application was tested in MATLAB System Generator. It integrates two separate fields Digital Signal Processing (DSP) and Very Large Scale Integration (VLSI). The structure and chronological procedure followed focuses on the sophisticated DSP design and implementation of a Fast Fourier Transform (FFT) spectrum analyzer. The entire system was implemented in MATLAB Simulink Xilinx System generator (SG) toolbox. After simulation, the verilog coding was extracted and implemented on FPGA Virtex II device. As a part of betterment, FIR filter of the analyzer was replaced with Goertzel filter in order to improve the area efficiency of the FPGA device. It provides better frequency resolution and helps in extracting the amplitude component of the signal, thus aiding in improved spectral analysis.

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Keywords

Coordinate Rotation digital computer (CORDIC), Digital Signal Processing (DSP), Direct Digital Synthesizer, FIR filter, Field Programmable Gate Array (FPGA) devices, Goertzel Filter, Mixer, windowing