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Analogue Loudspeaker Measurement with -3-D- Display

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.

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AES - Audio Engineering Society