Registers – Transfer mechanism – Traveling pawl
Patent
1973-11-05
1976-01-13
Malzahn, David H.
Registers
Transfer mechanism
Traveling pawl
324 77B, G06F 1534
Patent
active
039327370
ABSTRACT:
Precalculated samples of a power-density spectrum, taken at equispaced frequencies, are converted into modified samples with a nonlinear (e.g. logarithmic) distribution by being selectively weighted with the aid of several groups of coefficients defining a series of overlapping windows of mutually different widths. The system determines the weighting coefficient whose position in the frequency band of any window is closest to that of a precalculated sample appearing within that window; for each window, any sample appearing therein is multiplied by its closest coefficient and the sum of the resulting products is then divided by a factor proportional to the width of the window.
REFERENCES:
patent: 3566035 (1971-02-01), Noll et al.
C. Bingham et al., "Modern Techniques of Power Spectrum Estimation," IEEE Trans. on Audio & Electro, June 1967, pp. 56-66.
G. C. Maling, Jr. et al., "Digital Determination of Third-Octave & Full-Octave Spectrum of Acoustic Noise," IEEE Trans. on Audio & Electro., June 1967, pp. 98-104.
P. D. Welch, "The Use of FFT for the Estimation of Power Spectra: A Method Based on Time Averaging Overshort, Modified Periodograms," IEEE Trans. on Audio & El.," June 1967, pp. 70-73.
"Thomson-CSF"
Dubno Herbert
Malzahn David H.
Ross Karl F.
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