残響が長い系の伝達特性の測定 : 狭帯域化ディジタル処理の利用

概要

論文の詳細を見る
A method of narrow-band digital signal processing for the measurement of transfer characteristics of the system with long reverberation is described. At first the effects of reverberation on the measurement of transfer characteristics are discussed. The experimental results indicate that it is necessary to utilize the weighted time window, such as Hanning window, whose length is much longer than reverberation time. However the maximum window length of FFT processor is often too short when the acoustic system has long reverberation. The proposed method solves the problem of the limited window length by using the characteristics of FFT and the sampling theorem for band-limited signal. The method of processing is described in detail. The digital filter for obtaining the band-limited signal is also discussed. From the experimental results it is found that the proposed method is very useful for the accurate measurement of the transfer characteristics.
社団法人日本音響学会の論文
1979-11-01