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Cisco TelePresence System Codec C90 and Prole 65” Dual using C90 Administrator guide
D14635.05 Prole C90 and Codec C90 Administrator Guide TC4.1, February 2011.
Copyright © 2010-2011 Cisco Systems, Inc. All rights reserved.
www.cisco.com
Requirement for speaker systems
connected to a Cisco TelePresence
C Series codec
Cisco has put in a lot of eort 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 o “Motion Flow”, “Natural Motion”
or any other video processing that introduces additional delay.
Some consumer TVs also support advanced audio processing
like “Virtual Surround” eects and “Dynamic Compression” to
improve the TV experience. Such processing will make any
acoustic echo canceller malfunction and should hence be
switched o.
Some monitors are equipped with a setting called ‘Game
Mode’. This mode is specically designed to help reduce the
response time and will usually help to reduce the delay.
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