Cisco D9054 Installation And Operation Manual page 132

Setting Up the Layer II Audio Input,
If the encoder is equipped with a Multiple Channel Audio (MCA) card, and the
Joint Stereo mode is selected, the audio encoder utilizes an adaptive algorithm
to automatically and optimally switch between stereo mode and joint stereo
mode (based on the data rate, sample rate, and audio content). It is
recommended to select the Joint Stereo mode as the default setting for all data
rates. For data rates below 192 kbps, Joint Stereo mode is highly recommended
for optimal audio quality. The Stereo mode is used to operate in stereo mode
only, without automatic switching and to operate at data rates of 192 kbps and
above.
10. Set the PES Frame Count.
Use this field to set the desired number of audio frames in each PES packet. This
affects the number of stuffing bytes inserted in the encoded audio stream, but
has little affect on the encoding quality. The legal range is from 1 to 8. The
default value is 8.
11. Set the Digital Level.
You may type a value in the range from -12 to 12 dB. The default is 0 dB.
12. Set the Relative Delay.
The legal range is from -1000 to 1000 ms.
Use this field if you want to adjust the encoding audio delay to synchronize
audio with video in a program which has both.
Example: If you use external video equipment which adds to the video delay,
you type a positive external audio delay value corresponding to the external
video delay.
Note: You cannot set a positive relative audio delay greater than the end-to-end
delay determined by the video encoder.
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D9054 HDTV Encoder Intstallation and Operation Guide 4038938 Rev A