Modified Prony method approach to echo-reduction measurements

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Abstract
A modified Prony method is presented for measuring the steady-state echo reduction of acoustic panels. The method extrapolates the steady-state amplitudes from the transient portion of the signal allowing time-limited measurements. The method is applied to measurements of square panels 76 cm on an edge and 0.95-cm thick of steel and aluminum in the frequency range of 3–10 kHz. The signals were time limited to 200 μs (0.6 to 2.0 wavelengths) by the arrival of the diffracted signal from the panel edges. Results are compared with theoretical values and indicate the method is capable of making measurements subject to ambient noise.

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