High speed frequency response measurement

Details High speed frequency response measurement High speed frequency response measurement

1976-11-08

1978-06-06

Wise, Edward J.

Boots, shoes, and leggings

324 77B, 364726, 364579, 364572, G06F 1534

Patent

active

040939880

ABSTRACT:
A binary pseudo-random sequence generated by a shift register with feedback is used as a noise signal for testing an electrical or mechanical system, and the output is sampled and the power spectra computed by discrete Fast Fourier Transform techniques. The sequence bit interval and sampling interval have a predetermined ratio, and either the noise signal or output test signal is low pass filtered, with the result that closely spaced equal amplitude sine waves are effectively applied to the system under test and their responses separated at the output with no statistical uncertainty.

REFERENCES:
patent: 3506962 (1970-04-01), Brenner
patent: 3529140 (1970-09-01), Doering
patent: 3694643 (1972-09-01), Smith
patent: 3764995 (1973-10-01), Helf, et al.
patent: 3780274 (1973-12-01), Thompson, et al.
patent: 3932737 (1976-01-01), Delepine
patent: 3984770 (1976-10-01), Chu

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