Realme DA2001, Руководство пользователя

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Part 1. 25dB ANC
ANC
Listen to external noise through the
feedforward microphone so that the headset
sends a reverse anti-noise wave to eliminate
Depth can reach nearly 25dB
It can reduce the noise up to 25db. If the external
noise is 95DB, put on earbuds and turn on the Noise
Cancellation mode, the noise you hear will be
70db(95db-25dB), while if the external noise is 65db,
the noise you hear will be (65db-25dB)40DB.
(The above is the theoretical data, the actual noise
reduction rate is related to the type of sound, the
effect on the low-frequency sound is more obvious)