The zoom FFT using complex modulation
Hoyer, Elmer A. Stork, R.
Hoyer, Elmer A.
Stork, R.
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Issue Date
1977-05-01
Type
Conference paper
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Keywords
Autocorrelation,Discrete Fourier transforms,Discrete transforms,Fast Fourier transforms,Frequency,Sampling methods,Signal resolution,Spectral analysis,Speech analysis
Subjects (LCSH)
Citation
Hoyer, E.; Stork, R.; , "The zoom FFT using complex modulation," Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '77. , vol.2, no., pp. 78- 81, May 1977
doi: 10.1109/ICASSP.1977.1170177
Abstract
A recent paper by Yip discussed the zoom transform as derived from the defining equation of the FFT. This paper simplifies the concepts and removes some of the restrictions assumed by Yip; ie., the total number of points need not be a power of 2. The technique is based on first specifying the desired center frequency, bandwidth, and frequency resolution. The signal is then sampled, modulated, and lowpass filtered. This result is purposely aliased, then transformed using an FFT algorithm. The result is an M-point frequency spectra of the desired bandwidth centered about the center frequency with a higher degree of resolution than could be directly obtained using an M-point transform.
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The full text of this article is not available on SOAR. WSU users can access the article via IEEE Xplore database licensed by University Libraries: http://libcat.wichita.edu/vwebv/holdingsInfo?bibId=1045954
Publisher
IEEE
Journal
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Series
Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '77. , vol.2, no., pp. 78- 81