There are two main noise reduction technologies for Bluetooth headset: passive noise reduction and Active noise control.
Passive noise reduction: By designing the physical structure and materials of the earphones to block external noise from entering the ear, the effect of noise reduction is achieved. Generally speaking, the passive noise reduction effect is mainly influenced by factors such as ear pad materials and airtightness.
Active noise control: Active noise control refers to the use of electronic devices to conduct real-time analysis and reverse elimination of external noise, so as to achieve the effect of noise reduction. Active noise control is generally divided into two ways: reverse cancellation and noise masking. Reverse cancellation utilizes a microphone to monitor external noise in real-time and output opposite waveforms, thereby eliminating each other; And masking noise is achieved by playing white noise in the air to mask external noise and reduce its interference with people.
In general, the effect of Active noise control is more significant than that of passive noise reduction, but the cost is also higher. In recent years, with the performance improvement and cost reduction of noise reduction chips, the application of Active noise control technology in Bluetooth headsets has become more and more extensive.
