Thibodeau L M, Saucedo K A
Department of Speech Communication, University of Texas, Jesse H. Jones Communication Center, Austin 78712-1089.
J Speech Hear Res. 1991 Jun;34(3):628-35. doi: 10.1044/jshr.3403.628.
In the absence of national or international electroacoustic standards for the evaluation of Frequency Modulated (FM) amplification systems, it becomes important to know the variability one may expect across similar models. Evaluation of thirty FM systems of the same model obtained from three different educational sites was performed to determine the variability that may occur as a result of the receiver, lapel microphone, or neckloop. There was a range as great as 20 dB in high frequency average saturation sound pressure level and equivalent input noise across receivers, lapel microphones, and neckloops. These results highlight the need for regular electroacoustic monitoring of not only the FM transmitter and receiver, but also the individual components, such as the lapel microphone and the neckloop.
在缺乏用于评估调频（FM）放大系统的国家或国际电声标准的情况下，了解类似型号之间可能存在的差异就变得很重要。对从三个不同教育场所获得的同一型号的30个FM系统进行了评估，以确定由于接收器、领夹式麦克风或颈圈可能产生的差异。接收器、领夹式麦克风和颈圈在高频平均饱和声压级和等效输入噪声方面的差异范围高达20 dB。这些结果凸显了不仅要对FM发射器和接收器，而且要对诸如领夹式麦克风和颈圈等单个组件进行定期电声监测的必要性。
