A method of taking Cumulative Decay Spectra using tone bursts and relatively simple analogue circuitry is described. They can either be the same as 'Impulse-FFT-Digital', or can give 'cycles delay' and logarithmic frequency display and analysis. This allows the designer to fairly compare delayed resonances throughout the spectrum.
https://www.aes.org/e-lib/browse.cfm?elib=2915
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