Zero crossing based spectrum analyzer and method

Details Zero crossing based spectrum analyzer and method Zero crossing based spectrum analyzer and method

1992-08-11

1994-04-05

Teska, Kevin J.

Boots, shoes, and leggings

364553, G01R 2315

Patent

active

053011236

ABSTRACT:
A zero crossing based spectrum analyzer, a method that samples zero crossings of a signal waveform containing only real zeros and uses this information to determine the discrete Fourier Transform coefficients, is disclosed. A band-limited signal represented by real and complex zeros is converted by invertible techniques to a signal that contains only real (physical) zeros. This converted signal is applied as the input signal to the zero crossing based spectrum analyzer.

REFERENCES:
patent: 3626168 (1971-12-01), Norsworthy
patent: 3878724 (1975-04-01), Allen
patent: 3881097 (1975-04-01), Lehmann et al.
patent: 3984669 (1976-10-01), Lehmann et al.
patent: 4286326 (1981-08-01), Houdard
patent: 4358733 (1982-11-01), Hanahara
patent: 4640134 (1987-02-01), Simmons
Comparison of Zero-Crossing Counter to FFT Spectrum of Ultrasound Doppler-Cote et al.-1988 (no month), pp. 498-502.

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