Fast Fourier transform spectral analysis system employing adapti

Details Fast Fourier transform spectral analysis system employing adapti Fast Fourier transform spectral analysis system employing adapti

1979-02-12

1980-10-28

Malzahn, David H.

Boots, shoes, and leggings

G06F 15332

Patent

active

042311039

ABSTRACT:
A spectral analysis system includes a Fast Fourier Transform (FFT) processor which receives a time domain signal and provides a specified number of initial signal strength estimates, each of the initial estimates being equal to one of the frequency domain coefficients of the Fast Fourier Transform of the time domain signal which is generated when the time domain signal is sampled at a number of intervals equal to the number of initial estimates, over a time period of specified duration. The system further includes an adjustable window element receiving a selected number of the initial estimates for sensing or detecting the presence of a leakage component in a given one of the initial estimates, and for providing an adjusted signal strength estime, the adjusted signal strength estimate comprising the difference between the given initial estimate and the leakage component. A spectral recorder receiving a number of adjusted estimates is provided to record the spectral lines, or frequency components, of the time domain signal, and the relative strengths thereof.

REFERENCES:
patent: 3611411 (1971-10-01), Moshier
patent: 3714566 (1973-01-01), Kang
patent: 3721812 (1973-03-01), Schmidt
patent: 3731188 (1973-05-01), Smith
patent: 3808412 (1974-04-01), Smith
patent: 4054785 (1977-10-01), Lehmann
Harris, "On the Use of Windows for Harmonic Analysis With the Discret Four Transform", Proceedings of the IEEE, vol. 66, No. 1, Jan. 1978, pp. 51-83.
Babic et al., "Optimum Low-Order Windows for Discrete Fourier Transform Systems", IEEE Trans. on Acoustics, Speech, and Signal Processing, vol. ASSP-24, No. 6, Dec. 1976, pp. 512-517.

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