What is Noise Cancellation?
>> Noise cancellation (also known as active noise control, active noise reduction (ANR) or antinoise) is a method for reducing unwanted sound. 
Modern noise cancellation is achieved through the use of a computer (the DSP), which analyzes the waveform of the background aural or nonaural noise, then generates a polarisation reversed waveform to cancel it out by interference. This waveform has identical or directly proportional amplitude to the waveform of the original noise, but its polarity is reversed. This creates the destructive interference that reduces the amplitude of the perceived noise.

What is Echo Cancellation?
>> The term echo cancellation is used in telephony to describe the process of removing echo from a voice communication in order to improve voice quality on a telephone call. In addition to improving subjective quality, this process increases the capacity achieved through silence suppression by preventing echo from traveling across a network.

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