audio frequency change
... 声频仪器，声频装置 audio frequency apparatus，AFA 声频改变 audio frequency change，AFC 声频电路 audio frequency circuit ...
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通过改变消声器的两腔容积比，可以改善消声器的有效消声频率范围。
Changing volume ratio of the two-chamber muffler can improve the effective noise reduction frequency range of the muffler.
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实验证明，通过改变超声频率可实现对激光光束方向的控制。
Experiment showed control the direction of laser could be controlled by changing ultrasonic frequency.
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