Sony A846 - Manual (Page 93)

ModelName: Falcon_E
PartNumber: 4-164-613-11
  Using the Noise Canceling Function
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About Noise Canceling
The internal microphone embedded in the headphones picks up ambient noise.
The player generates an antiphase sound wave against the ambient noise to
reduce it. The Noise Canceling function can reduce unwanted ambient noise
especially in a vehicle such as an airplane, train, bus, etc., allowing you to enjoy
music at a low volume.
Note
 If the supplied headphones are not used properly, the effect of the Noise Canceling
function may be degraded. To make the most of the function, use the correct size
earbuds to fit your ears and insert the headphones into your ears snugly.
 Rubbing noises may occur while wearing headphones. It is not a malfunction.
 The Noise Canceling function mainly reduces the ambient noise in the low frequency
bands and has less effect on ambient noise in the higher frequency bands, such as
speaking voices and ringing tones. It has no effect on certain sounds.
 Do not cover the microphone part of the headphones with your hands, etc., otherwise
the Noise Canceling function may not work.
Continued 
Microphone
1 The waveform of the ambient
noise (original sound).
The internal microphone embedded
in the headphones picks up the
ambient noise. Then, the Noise
Canceling circuit analyzes the
waveform of the noise.
2 The antiphase waveform
against the noise.
The player generates the antiphase
waveform against the noise to cancel
it out.
3 The composite waveform. Two
waveforms have canceled
each other out.
The original waveform and antiphase
waveform combine to cancel each
other out, reducing ambient noise.
Using the Noise Canceling Function