When you plug a Huawei mobile phone into a noise-canceling headset, the phone automatically charges the headset. When the charging indicator lights up, it indicates that the headset is being charged.
[Stop charging] : Press and hold the round button on the active noise-cancelling headset, then insert the headset into the phone, wait a second and release the button. At this time, the charging light is no longer on, and the phone will not charge the noise-canceling headphones at this time.
Huawei active noise cancelling headset: equipped with exclusive noise cancelling circuit, including customized high-sensitivity MEMS silicon microphone and professional noise cancelling chip, by receiving and analyzing the external noise spectrum and generating signals in the opposite phase to offset it, so as to achieve the purpose of shielding external noise, and bring users a peaceful and quiet private space.
[Design concept] : All-metal one-piece three-button design, elegant sandblasted surface, adjustable volume, control play, answer\/hang up calls, music and phone all in control. Ordinary earphones achieve three-key wire control function through mic voltage division, but the MIC circuit of noise-cancelling earphones also assumes the function of charging, forming Huawei's unique three-key wire control technology.
【 Application principle 】 :
1, the signal microphone installed in the earphone first detects the low-frequency noise (100 ~ 1000Hz) in the environment that the ear can hear.
2, and then the noise signal is transmitted to the control circuit, the control circuit for real-time calculation.
3, through the Hi-Fi speaker to play the phase opposite to the noise, the same amplitude of sound waves to offset the noise.
4. The noise disappears and can not be heard after superposition.