Dirks D D, Kamm C A, Dubno J R, Velde T M
Scand Audiol. 1981;10(4):239-46. doi: 10.3109/01050398109076187.
The purpose of this experiment was to determine the relationship between the loudness discomfort level (LDL) and maximum speech recognition performance for listeners with sensorineural hearing loss. Performance-intensity functions were obtained for 30 listeners with mild to moderate sensorineural hearing impairment at five speech levels from -18 to +4 dB re: the LDL. Recognition scores were obtained for three speech materials. For all speech materials, recognition scores at levels below the LDL were equivalent to or higher than scores obtained at and above the LDL. These results support the contention that the LDL represents a sound pressure level above which no improvement in speech recognition occurs, and thus, might reasonably be used as the appropriate level for the saturation sound pressure level of a hearing aid.
本实验的目的是确定感音神经性听力损失患者的响度不适阈（LDL）与最大言语识别性能之间的关系。对30名轻度至中度感音神经性听力障碍患者，在相对于LDL为-18至+4 dB的五个言语声级下获得了性能-强度函数。针对三种言语材料获得了识别分数。对于所有言语材料，低于LDL声级的识别分数等于或高于在LDL及LDL以上声级获得的分数。这些结果支持了这样的观点，即LDL代表了一个声压级，高于该声压级言语识别不会得到改善，因此，可以合理地将其用作助听器饱和声压级的合适水平。
