This doesn't sound like dynamic frequency changes yet and in fact it isn't.

这听起来还不是动态频率改变，实际上它也不是。

youdao

As the drill’s frequency changes, the waveform quickly adapts to maintain the silence.

当牙钻的频率变化时，装置的波形也会迅速改变以适应从而保持无声。

youdao

These changes in perceived loudness may help you to spot inaudible frequency changes.

这些可闻的响度的改变可能帮助你识别不可闻的频率改变。

youdao

Controllers have pop-up windows with various choices of standard messages for altitude changes, frequency changes and some re-routings.

WSJ: Texting While Flying: Help for Pilots

On both sides of the Atlantic the frequency of price changes varies enormously.

ECONOMIST: Economics focus

To avoid detection it changes frequency almost every day.

ECONOMIST: Thailand's red-shirt opposition