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<h1>Noise Suppression</h1>

<p>The majority of mobile phones are used in urban environments.
This makes background noise an important factor in the final voice quality
perceived by the end-user. A high background noise level and low signal-to-noise
ratio (SNR) can degrade voice quality so much that the listener becomes annoyed
or concentrates on background sounds rather than speech. In very low SNR conditions,
even the intelligibility of the conversation might suffer.</p>


<p>Therefore, one way to improve customer satisfaction and
to reduce churn, is to improve the signal-to-noise ratio of calls. By using
Nokia Noise Suppression (NS), implemented in the TCSM2, the SNR is effectively
increased by lowering the noise level without attenuation of the speech signal.</p>


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<p>Nokia NS is compatible with all existing GSM speech codecs
(FR/HR/EFR) and can be activated individually for each codec on the A interface
timeslot or PCM circuit basis. Furthermore, the Nokia NS can be used either
on the uplink or downlink, or it can be active in both directions. The level
of noise suppression can be adjusted by the MML. As Nokia NS is only an additional
feature in the TCSM2 software, no hardware or firmware upgrades are needed
to make use of this feature.</p>


<p>The Nokia Noise Suppression is a state-of-the-art quality
solution, which provides excellent voice quality by removing the background
noise and is compatible with all FR/EFR/HR codecs and AEC feature. With this
solution, it is possible to increase end-user satisfaction.</p>


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<dt class="note-caption">Note</dt>
<dd>Noise Suppression is available for TCSM2 PCM types A (FR&amp;EFR&amp;144)
and B(HR).</dd>
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