Objective to probe into the effects of military noise on the hearing threshold of the speech frequency and high frequency in the elders.
目的探讨军事噪声对老年人言语频率及高频听力的影响。
Based on the equal-loudness curve, a speech frequency equalizer is designed combing with the principle of electronic-to-sound transform.
以人耳等响曲线为依据，结合电声转换的原理，设计了一种语音频率均衡电路。
There was no significant difference between the groups who had high frequency or speech frequency hearing loss in annum and working ages.
高频及语频听力损失率在各年份及各工龄组间差异无统计学意义。
There was no significant difference between the groups who had high frequency or speech frequency hearing loss in annum and working ages.
高频及语频听力损失率在各年份及各工龄组间差异无统计学意义。
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