Schwartz D M, Larson V D, De Chicchis A R
Ear Hear. 1985 Sep-Oct;6(5):274-7. doi: 10.1097/00003446-198509000-00011.
This study sought to determine differences in the acoustic spectra of five different transducers commonly used for stimulus presentation to record the auditory brain stem response (ABR). The outputs of three commercially available bone conduction vibrators (Radioear B-70A, B-71 and B-72), a TDH-49 earphone, and an insert receiver were measured by applying a 0.1 msec rectangular electrical pulse to each transducer. The resultant output for each transducer was converted to one-third octave band data and plotted against reference threshold levels. Results demonstrated relatively flat acoustic spectra and high output levels for the two air conduction receivers. In contrast, each of the bone oscillators had its greatest concentration of energy in the 2000 Hz region with the spectrum characterized by a precipitous decrease in output at frequencies above and below this resonance peak. Maximum output never exceeded 35 dB HL for any of the three bone conduction devices. Of the three oscillators, however, the B-70A appeared to provide the highest output before reaching saturation. Results are discussed relative to the limitations for recording the auditory brain stem response to bone conducted transient signals.
本研究旨在确定常用于刺激呈现以记录听性脑干反应（ABR）的五种不同换能器的声谱差异。通过向每个换能器施加0.1毫秒的矩形电脉冲，测量了三种市售骨传导振动器（Radioear B - 70A、B - 71和B - 72）、一个TDH - 49耳机以及一个插入式接收器的输出。将每个换能器的所得输出转换为1/3倍频程带数据，并相对于参考阈值水平进行绘制。结果表明，两种气导接收器具有相对平坦的声谱和高输出水平。相比之下，每个骨振荡器在2000赫兹区域具有最大能量集中，其声谱特征是在该共振峰以上和以下频率处输出急剧下降。对于三个骨传导装置中的任何一个，最大输出从未超过35分贝听力级。然而，在这三个振荡器中，B - 70A在达到饱和之前似乎提供了最高输出。讨论了这些结果与记录对骨传导瞬态信号的听性脑干反应的局限性相关的情况。
