Abstract
A computer-based system for real time analysis and display of acoustic data is described. A mini computer and special purpose Fourier transform hardware are combined to permit continuous FFT and auto spectral analysis, and/or coherency analysis. In addition, software is available to perform various post-FFT analyses, including spectral whitening, automatic narrow-band energy detection and harmonic analysis. A second computer has been dedicated to the formatting and displaying of analysis results. Being programmable allows operation of the computer-controlled display in various modes, such as A scan, time-frequency-amplitude alphanumeric, and combinations thereof. High-speed rotational engine radiated noise and line component data have been analyzed and results are presented.
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