Acoustic Noise Cancelling
®
headphone technology is a method of
reducing unwanted noise by electronically creating a signal that is the
mirror image of the unwanted noise. Microphones in the earbuds monitor
sound at the user’s ear. The monitored sound (music and noise) is
compared to the sound the user wants to hear (the signal coming from
the audio input – this could be music or silence). The difference between
the monitored sound (from the earbud’s microphones) and the sound the
user wants to hear (music or silence) is noise. The system electronics
instantly process the noise signal, and a precise equal and opposite signal
(correction signal) is created. This opposite signal is then sent to the
speaker in the earbud along with the sound the user wants to hear
(again, this could be music or silence). The result is three signals being
presented to the user’s ear:
1. Noise (monitored by the earbud microphones) from the environment.
2. The sound the user wants to hear (music or silence) from the audio
input.
3. The correction signal from the system electronics.
The noise and correction signal cancel each other (1 + -1 = 0), providing
a clean, high-fidelity sound signal at the ear.
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