Air pressure on the surface of the Earth is fairly constant, so in designing a microphone for use on land, engineers don't have to worry about large variations in air pressure.
地球表面的气压相对稳定，因此设计地面用的传音器，工程师并不需烦恼气压的大幅变化。
If the toy has a clearly defined operating cycle, measure the time average (the equivalent continuous) sound pressure level in each microphone position during at least one whole cycle.
如果被测玩具有明显的运行周期，至少在一个完整周期内测得每个麦克风的按时平均(均等连续)声压水平。
Additional electronics have been added to provide film heating for calibration and to amplify the signal from the head's microphone pressure sensor.
附带的电子器件可增加校准时的薄膜加热功能和放大从探头的扩音压力传感器输出的信号。
Additional electronics have been added to provide film heating for calibration and to amplify the signal from the head's microphone pressure sensor.
附带的电子器件可增加校准时的薄膜加热功能和放大从探头的扩音压力传感器输出的信号。
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