Bluetooth headset is one of the indispensable audio devices in our daily life, in order to provide a better audio experience, Bluetooth headset gradually adopted the noise reduction technology, so that users can quietly enjoy the pure music world. So how do Bluetooth headsets achieve noise cancellation? The following is a detailed introduction to the headset noise reduction principle and the way.
Active noise reduction technology
Active noise cancellation technology is one of the common ways of noise reduction in Bluetooth headphones, is through the headset internal electronic circuit and signal processor to achieve. The principle of active noise cancellation technology is as follows:
1、 microphone collects noise signal: the microphone on the Bluetooth headset will collect the noise signal in the surrounding environment.
2、 signal processing and reverse phase elimination: the processor inside the headset will process the collected noise signal and generate a sound wave signal opposite to the noise.
3、 mixing and elimination: the generation of sound wave signal opposite to the noise will be mixed with the audio signal played by the headphones to achieve the phase elimination of noise.
4、Output: The mixed sound signal is output through the speaker of the headphones, thus reducing the interference of external noise to the user.
This active noise cancellation technology usually requires headphones built-in battery or power supply to provide enough power to support the work of electronic circuits.
Passive noise cancellation technology
In addition to active noise cancellation technology, Bluetooth headset also uses passive noise cancellation technology to further reduce the interference of external noise. Passive noise cancellation technology of Bluetooth headset is to reduce the transmission and interference of external noise by physical means without the use of electronic circuitry.
The following are some common applications of passive noise cancellation technology in Bluetooth headset
1、 sealing performance: the design of the headset can use sealed ear cups or ear plugs, which fit closely to the ear to reduce the penetration of external noise.
2、Noise insulation material: The headset uses noise insulation materials inside, such as foam pads and damping materials, which can absorb and reduce the reflection and transmission of noise.
Passive noise cancellation technology does not require additional electrical support and is suitable for reducing high-frequency noise, such as noisy office environments or the noisy sound of coffee shops.
Modern Bluetooth headsets typically use a combination of active and passive noise cancellation to minimize the interference of external noise and provide a clearer, cleaner audio experience. This allows users to enjoy high quality music or calls in a variety of environments, enhancing the experience.
