Apparatus and method for measuring frequency response function

Details Apparatus and method for measuring frequency response function Apparatus and method for measuring frequency response function

1988-11-16

1989-12-05

Tokar, Michael J.

Boots, shoes, and leggings

G06F 1531

Patent

active

048857084

ABSTRACT:
A plurality of relatively prime excitation waveforms are generated and applied to an object to be measured. Data of the excitation waveforms and a response waveform from the object are extracted by one frame every n frames and subjected to Fourier transform, thereby computing an input auto spectral matrix and an input-output cross spectral matrix. A frequency response function of the object is calculated from averaged spectral matrices obtained by adding and averaging corresponding elements of the corresponding spectral matrices a predetermined number of times. Readout start addresses for multiple waveforms, each stored in one of a plurality of waveform memories and having continuity at both ends, are shifted relative to each other every n frames, thereby obtaining the plurality of relatively prime excitation waveforms.

REFERENCES:
patent: 3973112 (1976-08-01), Sloane
patent: 4061017 (1977-12-01), Sloane et al.
patent: 4067060 (1978-01-01), Poussart et al.
patent: 4539518 (1985-09-01), Kitayoshi
patent: 4654809 (1987-03-01), Adcock
patent: 4658367 (1987-04-01), Potter

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