ANC noise reduction and ENC noise reduction wireless earbuds longest play time

 ANC is the abbreviation of Active Noise Cancellation, translated as Active Noise Cancellation. It is well known that sound waves interfere with each other as they travel through the air. Interference occurs when the sound waves from two sound sources with the same frequency and vibration direction and in sync with each other are superimposed on each other. If the phases of the two sound sources are opposite, the amplitude of the two sound waves will decrease and the sound pressure will decrease. If the amplitudes of the two sound waves are equal, they cancel out completely. ANC uses the phenomenon of destructive interference of sound waves. Its working principle is that the earphone generates a sound wave with the same frequency and amplitude but opposite phase according to the collected noise, and is played by the speaker in the ear canal. In the end, what the human ear hears is the result of the superposition of the ambient noise and the inverted ambient noise. Therefore, it sounds l ike the noise is reduced. ANC mainly reduces mid- and low-frequency noise in the environment. This enables consumers to enjoy music even in a noisy environment without raising the volume. www.bjbjaudio.com

 The full name of ENC is Enviro nmental Noise Cancellation (environmental noise reduction technology). It can effectively suppress 90% of the reverse environmental noise, thereby reducing the environmental noise by up to 35dB, allowing gamers to communicate more freely. ENC includes single-mic ambient noise reduction and dual-mic ambient noise reduction. Single-mic ambient noise reduction usually estimates the noise on the premise that the ambient noise is random and stationary additive noise and is not related to the speech signal, and then performs filtering. Therefore, the effect of noise reduction in a single-mic environment is relatively poor. Dual-mic environmental noise reduction uses a dual-microphone array to accurately calculate the speaking position of the caller, and filter out various interfering noises in the environment while protecting the target voice. Its working principle is roughly as follows: before the calculation of the ambient noise filter module, the gain of the speech microphone and the reference microphone, and the delay of the two microphones are corrected. Then, it is detected whether the data collected by the voice microphone is a voice segment. If it is a voice segment (that is, an uplink call), the ambient noise is estimated according to the ambient noise collected by the reference microphone and the voice data of the voice microphone, and the corresponding noise suppression parameters are calculated, and finally the ambient noise is filtered out by the filter module; otherwise , no ambient noise filtering is performed, and the uplink call output is muted. ENC mainly reduces non-target voice noise during calls to ensure clear calls. www.bjbjaudio.com 

As a very important part of the TWS headset function, the ENC function has a decisive effect on the call effect in complex environments. As the simplest and most common ENC solution, dual-mic noise reduction is widely used in various communication devices and will remain the mainstream choice in the next few years. www.bjbjaudio.com