Saturday, September 14, 2019

How MOTOROLA LIFESTYLE ANC (Active Noise Cancellation) works?! What Is The Top Pick For Noise Canceling Headphones Under $200 (2019)

From the source from MOTOROLA LIFESTYLE audio experts, how ANC works in Motorola ANC products?! Here is the study from Alan Luusama Lee, one of the MOTOROLA audio experts.

Active noise control
 (ANC), also known as noise cancelling, or active noise reduction (ANR), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first.


In scientific point of views, sound is a pressure wave, which consists of alternating periods of compression. Generally, a noise-cancellation earphone/speaker emits and picks up a sound wave with the same amplitude but with inverted phase to the original sound.

The waves combine to form a new wave, in a process called interference and effectively cancel each other out – an effect which is called destructive interference. 
Modern active noise control is generally achieved through the use of analog circuits or digital signal processing


As MOTOROLA Lifestyle brand is aware, a true noise-cancellation earphone or speaker may be co-located with the sound source to be attenuated. In this case it must have the same audio power level as the source of the unwanted sound. Alternatively, the transducer emitting the cancellation signal may be located at the location where sound attenuation is wanted. (earphone or speaker)

This requires a much lower power level for cancellation. Noise cancellation at other locations is more difficult as the three-dimensional wavefronts of the unwanted sound and the cancellation signal could match and create alternating zones of constructive and destructive interference, reducing noise in some spots while doubling noise in others.

By using these sophisticated technologies, MOTOROLA LIFESTYLE brand has created several new series of ANC earphones and true wireless such as VerveBuds servies and Escape series, which claims "listen without distractions"









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