The turning frequency is also called the cutoff frequency. The full-level pass signal and the demarcation frequency of the signal that is attenuated or cut off. The signal above this frequency can pass at full level, and the signal with low frequency cannot pass at all. For example, the frequency marked next to the low-cut or high-pass filter function key is the corner frequency, meaning that the sound below this frequency no longer exists, and the sound above this frequency passes normally. The turning frequency of some devices is the corner frequency, which means low. The sound at this frequency no longer exists, and the sound above this frequency passes normally, and the turning frequency of some devices is continuously adjustable.
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