簡易ディジタル残響時間測定器の開発

概要

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A smallsized digitalized measuring instrument is described by which the reverberation time of auditoria and studios can be simply measured in the field. A calculating process of the instrument is based on Schroeder's "integrated impulse method", and the fundamental principle is the replacement of visual linear approximation of logarithmic decay curves with the method of least squares. Reading out procedure of wave forms of tone burst signals in all frequency ranges from ROM is adopted. Accuracy of calculation is improved and measuring times are considerable shortened by complete digitalization and automatic measuring operations. Measured results are displayed on a videomonitor or the like. By this measuring instrument, it is possible to measure not only reverberation time but also each room acoustic parameter such as the ratio of early to reverberant sound energy and "center time "of pulse response.
社団法人日本音響学会の論文
1979-11-01