Telepresence C-Series Codec - Cisco C20 Administrator's Manual

Cisco TelePresence System Quick Set C20 / C20 Plus and Profiles using C20
Contents Introduction
Requirement for speaker systems
connected to a Cisco TelePresence
C-series codec
Cisco has put in a lot of effort to minimize the camera to screen
delay on our TelePresence endpoints.
New consumer TVs are usually equipped with "Motion Flow" or
similar technology to insert new video frames between standard
frames to create smoother images. This processing takes time
and to maintain lip synchronization, the TV will delay the audio so
that the audio and video arrives at the same time.
The echo canceller in the Cisco endpoints can handle such
delay up to 30 ms. Many consumer TVs are not made for real
time video communication and may introduce more than 30 ms
of delay.
If you use such a TV together with a C-series codec it is
recommended that you turn off "Motion Flow", "Natural Motion" or
any other video processing that introduces additional delay.
Some consumer TVs also support advanced audio processing
like "Virtual Surround" effects and "Dynamic Compression" to
improve the TV experience. Such processing will make any
acoustic echo canceller malfunction and should hence be
switched off.
Some monitors are equipped with a setting called 'Game Mode'.
This mode is specifically designed to help reduce the response
time and will usually help to reduce the delay.
D14637.04 Profile C20 and Quick Set C20 Administrator Guide TC4.0, November 2010.
Copyright © 2010 Cisco Systems, Inc. All rights reserved.
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