Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Analysis of complex waves
Patent
1979-10-11
1981-10-20
Tokar, Michael J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Analysis of complex waves
324 77R, G01R 2316
Patent
active
042963745
ABSTRACT:
The present invention relates to a wideband digital spectrometer capable of obtaining the Fourier power spectrum of a combination of an input signal, using the Walsh functions. The input signal is low-pass filtered (10) at a cutoff frequency f.sub.c, then sampled at a rate of 2f.sub.c (12) to provide N sequences representative of the digitized input signal. Each one of the N sequences is combined with a separate one of the N Walsh functions (14), and the Walsh power spectrum of each one of these N combinations is then computed (16). These N Walsh power spectrum components are applied to an N.times.N Walsh-Fourier power transformer (18) which generates the desired N Fourier power spectrum components.
REFERENCES:
patent: 3581199 (1971-05-01), Spitz
patent: 3708746 (1973-01-01), Willett
patent: 3903401 (1975-09-01), Jayant
patent: 4057756 (1977-11-01), Leg
J. E. Gibbs, et al., "Applications of Walsh Functions to Transform Spectroscopy", Nature, Vol. 224, 12/6/69, pp. 1012-1013.
H. A. Gebbie, "Walsh Functions and the Experimental Spectroscopist", 1970 Proceedings, Applications of Walsh Functions, Washington, DC, 1970, p. 99.
J. Granlund, "An Application of Walsh Functions in Radio Astronomy Instrumentation," IEEE Trans on Electromagnetic Compatibility, Aug. 1978, pp. 451-453.
C. Pelle et al. "A High Speed Digital Autocorrelation Spectrometer for Millimeter Astronomy", Journal of Physics, E. vol. 8, No. 9, 1975, pp. 786-789.
J. G. Ables et al. "A 1024-Channel Digital Correlator," Rev. Sci. Instrum, vol. 46, No. 3, pp. 284-295.
H. F. Harmuth, "Applications of Walsh Functions in Communications," IEEE Spectrum, vol. 6, Nov. 1969, pp. 82-91.
Bell Telephone Laboratories Incorporated
Pfeifle Erwin W.
Tokar Michael J.
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