Effectiveness of BMN-SS impulse response measurement method for reverberation time measurement
Effectiveness of BMN-SS impulse response measurement method for reverberation time measurement
复制标题
BMN-SS 脉冲响应测量方法对于混响时间测量的有效性
DOI：
--
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Y. Kaneda
中科院分区：
文献类型：
--
作者：
Yohei Iiyama;Y. Kaneda
混响时间是根据房间脉冲响应计算的。在这种情况下，噪声分量的稳定功率电平相对于每个倍频程内脉冲响应的最大瞬时功率要求小于−45分贝。然而，当使用诸如TSP信号的常规脉冲响应测量信号时，噪声电平取决于频带。为此，必须使用长时间信号进行测量，以满足所有频段所需的噪声水平。因此，我们提出了一种频带最小噪声扫频正弦信号(BMN-SS)，它可以控制测量结果中每个倍频程频段的噪声水平。本文介绍了利用这种BMN-SS信号缩短混响时间测量时间的方法和在实际声场中的测量结果。利用BMN-SS信号，证实在本文所述的实验条件下，测量时间缩短了TSP信号的1/200和Log-SS信号的1/4。
The reverberation time is calculated from a room impulse response. In this case, the steady power level of the noise component is required to be less than −45 dB relative to the maximum instantaneous power of the impulse response in each octave band. However, when using a conventional impulse response measurement signal such as a TSP signal, the noise level depends on the frequency band. For this reason, a measurement using a long-time signal is necessary to satisfy the required noise level in all frequency bands. Therefore, we proposed a band-wise minimum noise swept sine (BMN-SS) signal that can control the noise level of each octave band in the measurement result. In this paper, we present the method of shortening the measurement time of the reverberation time using this BMN-SS signal and the measurement results in a real sound field. Using the BMN-SS signal, we confirmed the measurement time shortening by 1/200 of TSP signal and 1/4 of the Log-SS signal under the experimental condition stated in this paper.