Tackling echo-related issues presents a major challenge in just about every type
of network environment — requiring a complex blend of processing technologies
to handle it effectively and unobtrusively.
The benefits of adopting an integrated approach stem from the complex nature of the task involved. In a non-integrated approach, involving high background noise levels, the canceller’s non-linear processor (NLP) will allow the noise through, since any residual echo remaining
after cancellation would be expected
to be masked by the high background
noise. During midrange noise levels and
NLP operation, the Noise Reduction (NR)
algorithm sees the change in spectrum
and then adapts over a few tens of
milliseconds.
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