Can Active Noise Cancellation Be Installed Afterwards?

[VanRuth]

Active Noise Cancellation (ANC) is a noise reduction technology, originally one of the methods used in headphone noise cancellation, which can be installed afterwards. Below is relevant information: 1. The active noise cancellation function works by generating reverse sound waves equal to external noise through the noise cancellation system, thereby neutralizing the noise and achieving the noise reduction effect. Its principle is based on the fact that all sounds consist of certain frequency spectra. If a sound can be found whose frequency spectrum is exactly the same as the noise to be eliminated but with an opposite phase, the noise can be completely canceled out. 2. The three commonly used noise reduction measures—reducing noise at the source, during propagation, and at the human ear—are all passive. To actively eliminate noise, people invented the technology of 'active noise cancellation.'