User's Manual 154 Document #: LTRT-42060
Mediant 2600 E-SBC
echo signal’ (the output of this filter) is then subtracted from the input signal (which is the
sum of the desired input signal and the undesired echo) to provide a clean signal. To
suppress the remaining residual echo, a Non Linear Processor (NLP) is used, as well as a
double-talk (two people speak at the same time) detector that prevents false adaptation
during near-end speech.
The device also supports acoustic echo cancellation for SBC calls. These echoes are
composed of undesirable acoustical reflections (non-linear) of the received signal (i.e., from
the speaker) which find their way from multiple reflections such as walls and windows into
the transmitted signal (i.e., microphone). Therefore, the party at the far end hears his / her
echo. The device removes these echoes and sends only the near-end’s desired speech
signal to the network (i.e., to the far-end party). The echo is composed of a linear part and
a nonlinear part. However, in the Acoustic Echo Canceler, a substantial part of the echo is
non-linear echo. To support this feature, the Forced Transcoding feature must be enabled
so that the device uses DSPs.
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