Evaluation of Acoustic Properties of Enclosures by Means of Digital Computers

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Abstract
A method employing a digital computer for evaluating the acoustic properties of enclosures is described. Specially shaped tone bursts, generated on the computer, are radiated into the enclosure under study. The sound‐pressure responses at different locations in the enclosure are recorded on a magnetic tape. The data are converted into digital form by an analog‐to‐digital converter and are processed by the digital computer. The processing by the computer includes filtering (to improve signal‐to‐noise ratio), envelope detection, and evaluation of different quantities having subjective or physical significance. A microfilm plotter attached to the computer is used to plot the results. Among the quantities evaluated are reverberation times based on different portions of the decay; direct, early, and reverberant energies; and directional distribution of sound‐energy flux (diffusion). The different quantities are evaluated both as a function of frequency and location in the enclosure. Spatial and frequency averages of the different quantities are also evaluated.

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