Analyze all your data for frequency content in just a couple of clicks: autopowers, crosspowers or FRFs – at the bandwidth you want, and at the resolution you want. Fractional (1/n) octave analyses are computed using FFT techniques or by digital filtering techniques to ANSI S1.11–2004. Weighting functions are built-in for acoustic (A, B, C) as well as whole body vibration (Wk, Wd and Wf) applications – you can even apply different spectral weightings to different channels.
There is also a Fast Fourier Filtering glyph that performs FIR filtering in the frequency domain using a Kaiser-Bessel window – it provides ultra sharp low pass, high pass, band stop and band pass filtering.
Frequency analysis of non-stationary signals such as engine start, missile launch, gun-fire and other high-speed transients requires something more appropriate than the typical FFT approach. The GlyphWorks option for JTFA includes Short Time Fourier Transforms, Discrete Gabor Transforms, Wigner-Ville distributions… These methods produce spectrograms showing how frequency content varies with time, often with a much better resolution than would be achieved by traditional methods.
For more information on frequency domain tools, click here
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