Takenaka R&D Institute, 1-5-1, Otsuka, Inzai, Chiba 270-1395, Japan.
J Acoust Soc Am. 2012 Aug;132(2):799-803. doi: 10.1121/1.4729547.
Objective acoustical parameters for halls are often measured in 1-octave bands with mid-frequencies from 125 to 4000 Hz. In reality, the frequency range of musical instruments is much wider than that, and the fundamentals of the lower notes of bass instruments are contained in 31.5 or 63 Hz bands. Overtones of fundamentals in these bands fall in 125 Hz band. This report presents subjective experiments designed to determine to what extent the overtones in 125 Hz band and higher bands influence the loudness sensation of the components in 63 Hz band. In the experiments, the 125 Hz and higher components of the musical tone are used to act as a masker against the lower component used as a maskee. The threshold of the difference between G(125 Hz) and G(lower band) that just enables one to hear the fundamental tones in the lower band is determined. Masked loudness of 63 Hz sinusoidal tone caused by partial masking noise with higher frequencies was determined based on a similar procedure to the masked loudness-matching function. The result indicates that the difference in loudness of low tone will not be noticeable even if G changed by ±2.5 to ±3 dB, at least when there are other accompanying instruments.
厅堂的客观声学参数通常使用 1/3 倍频程带进行测量，中频范围为 125Hz 到 4000Hz。实际上，乐器的频率范围要宽得多，并且低音乐器的基频包含在 31.5Hz 或 63Hz 频段中。这些频段中的基频泛音落在 125Hz 频段中。本报告介绍了旨在确定在多大程度上，125Hz 及更高频段中的泛音会影响 63Hz 频段中分量的响度感觉的主观实验。在实验中，使用音乐音调的 125Hz 及更高频段作为掩蔽噪声来对抗用作掩蔽对象的低频段分量。确定了刚好能够听到低频段中基频的 G(125Hz)与 G(低频段)之间的差值的阈值，该差值能够刚好听到低频段中的基频。基于类似的掩蔽响度匹配函数程序，确定了由更高频率的部分掩蔽噪声引起的 63Hz 正弦音的掩蔽响度。结果表明，即使 G 值变化了±2.5 到±3dB，在至少存在其他伴随乐器的情况下，低频的响度差异也不会被注意到。
