In room acoustics the crossover time is defined as the transition period between a clearly deterministic regime (early sound field), to a stochastic, memoryless one (reverberant tale or late sound field). Several studies presented different calculation methods applied to impulse responses like running gaussianity test, running kurtosis, eXtensible Fourier Transform, and Matching Pursuit. No clear or “binary moment” was found analyzing the room’s responses, so another new, simple, and robust method is proposed to determine the limiting instant between both sound fields using the autocorrelation function. Conclusions also include the analysis of several rooms and comments on the progressive change of the room’s system behavior.
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