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CC013997 QC25 FAQ 5.6.14

Bose

QuietComfort

Acoustic Noise Cancelling

headphones

FREQUENTLY ASKED QUESTIONS

PRODUCT TECHNOLOGY

What is Acoustic Noise Cancelling

headphone technology?

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 earcups monitor

sound at the user’s ear and externally. 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 earcup’s microphone) and the

sound the user wants to hear (music or silence) is noise. The electronics in

the QuietComfort 25 Acoustic Noise Cancelling headphones 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 earcup 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 earcup 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 nearly cancel each other (1 + -1 = 0),

providing a clean, high-fidelity sound signal at the ear.

Bose QuietComfort 25

Acoustic Noise Cancelling headphones.

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Pagina 15

For internal and reseller distribution only – Bose confidential. CC013997 QC25 FAQ 5.6.14 9 Bose® QuietComfort® 25 Acoustic Noise Cancelling® he

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