由 hbfsfagtr 於 2022-01-19 13:57:54 發表 | 累積瀏覽 119
1, easy to use. Noise-cancelling headphones are headphones that use some method to reduce noise. At present, ANC Headphones ，noise-cancelling headphones are mainly divided into active noise-cancelling and passive noise-cancelling.
2. The noise reduction principle is as follows:
(1) First, the low-frequency noise (100 ~ 1000Hz) in the environment that can be heard by the ear is detected by the signal microphone placed in the earphone.
(2) The noise signal is then sent to the control circuit, and the control circuit performs real-time operations.
(3) Play the sound waves with the opposite phase and the same amplitude as the noise through Hi-Fi speakers to cancel the noise.
(4) After superposition, the noise disappears and cannot be heard.
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What does ANC on headphones mean?
