Interpretation of the ANC active noise reduction function of tws Bluetooth headset

The bluetooth headset factory knows that users choose the Bluetooth headset to bear the brunt of the sound quality of the bluetooth headset, followed by other appearances, functions, etc., so the bluetooth headset factory has been debugging good sound quality products to restore the original sound as much as possible, and restore the original sound as much as possible , I have to mention the noise reduction function of Bluetooth headsets. Today, the Bluetooth headset factory will interpret the ANC active noise reduction function for everyone.

Bluetooth headset factory

Active noise reduction is a noise reduction technology, which is one of the methods used in earphones to reduce noise. The active noise reduction function is to generate a reverse sound wave equal to the external noise through the noise reduction system to neutralize the noise, thereby achieving the effect of noise reduction. Its principle is that all sounds are composed of a certain frequency spectrum. If a sound can be found, its frequency spectrum is exactly the same as the noise to be eliminated, but the phase is just opposite to completely cancel the noise.

The three noise reduction measures commonly used to reduce noise, namely noise reduction at the sound source, noise reduction during propagation, and noise reduction at the human ear, are all passive. In order to actively eliminate noise, people invented the "active noise reduction" technology. Its principle is: all sounds are composed of a certain frequency spectrum. If you can find a sound whose frequency spectrum is exactly the same as the noise to be eliminated, but the phase is exactly opposite (a difference of 180°), the noise can be completely cancelled out. . The key is how to get the sound that cancels the noise. The actual method used is to start with the noise source itself and try to reverse the phase of the original noise through the electronic circuit. From this point of view, the technology of active noise reduction is actually "fighting poison with poison."

Noise-canceling headphones use active noise control, which is different from the passive sound insulation of general headphones. The principle is:

1. First detect the low-frequency noise (100 ~ 1000Hz) in the environment that the ear can hear by the signal microphone placed in the earphone (currently it can reach 3000Hz)
2. Then the noise signal is transmitted to the control circuit, and the control circuit performs real-time calculations
3. The Hi-Fi speaker emits sound waves with the opposite phase and the same amplitude as the noise to cancel the noise
4. So the noise disappears and is inaudible

Active noise-canceling headphones are expensive, but they are generally effective and comfortable to wear. However, a separate battery is required, and most passive noise reduction headphones can be used without power consumption (nor active noise reduction).
The 2020 bluetooth headset factory predicts that tws bluetooth headset will be the year of active noise reduction. The year is approaching. The bluetooth headset factory has received IDs from many brands. No surprises, they are all active noise reduction designs. The 2020 bluetooth headset factory Will go further in the Bluetooth headset market with good sound quality.
Passive Speaker:Bluetooth Speaker