Cisco 2000 User Manual page 109

The Audio Type setting is only related to AAC Encoding. If you select AMR in the Encoder field,
this setting is not used. The Audio Type field provides you with a drop-down box, which includes
two choices, as follows:
Main – This format is the same as LC (above), but adds backward prediction.
Low Complexity (LC) – The simplest and most widely used and support AAC audio format.
NOTE: Depending on the player on which the resulting stream will be heard, either choice will use a
specific set of tools to encode the audio stream. You should make your choice based on the
requirement of the playback software or device. The most widely supported format is LC profile.
The Audio Encoder settings provide you with a drop-down box, which includes two choices, as
follows:
AAC (Advanced Audio Coding) is a standardized, lossy compression and encoding scheme for digital
audio. AAC achieves better audio quality than MP3 and has been named a standard by the Motion
Picture Experts Group (MPEG)
AMR (Adaptive Multi-Rate Narrow-Band) is an audio data compression scheme optimized for speech
coding. AMR was adopted as the standard narrowband speech codec by 3GPP and is widely used in
GSM.
NOTE: When you select AMR Encoder for audio, the audio will automatically be encoded using
8KHz mono for playback on cell phones.
The Audio Bitrate drop-down box provides you with several choices, as can be seen in the figure
below.
Cisco Digital Media Encoder 2000 User Guide
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