free field
... filled system thermometer,压力式温度计 free field,自由声场 frequency modulation(fm),频率周制,调频 ...
free-sound-field
... free cutting steel 快削钢 free-sound-field 自由声场 freon 氟利昂 ...
free feild reciprocity calibration
field sensitivity of microphone ; free-field sensitivity of microphone
incident free sound field
自由声场 是指均匀各向同性的媒质中,边界影响可以不计时的声场。在自由声场中,声波将声源的辐射特性向各个方向不受阻碍和干扰地传播。