1. An instrument for measuring hearing activity for pure tones of normally
audible frequencies.
听度''。'计'。'',听力''。'计'。''对正常可听单音频的听觉能力测定仪。
2. On dictation equipment, a device that gives an
audible or visual signal at the end of the recording medium.
口述记录设备上的一种装置,当到达记录媒体末端时发出一个声响信号或可视信号。
3. PWM testing procedures after running through control of the Super Terminal can change frequency
audible and change.
PWM测试程序,运行后通过控制超级终端可以改变频率值及改变发声。