Setting Up Aac Processing - Cisco D9054 Installation And Operation Manual

Setting Up AAC Processing

To Set Up AAC Processing
Proceed as follows to set up AAC Processing:
1. From the user interface of the D9054 HD Encoder, click the Audio tab, expand
the AAC icon, expand the appropriate channel icon and click the Processing
icon from the sub-pages.
Note: The number of channels displayed depends on whether your encoder is
equipped with a Dual Channel Audio (DCA) card or a Multiple Channel Audio
(MCA) card. MCA cards provide six configurable audio channels, allowing you
to configure Ch 1 (Audio 1) through Ch 6 (Audio 6).
2. Select the Rate Mode. You may select Average or Fixed.
The default mode is Average. Average denotes an average rate whereas Fixed
denotes a constant rate. The fixed mode may result in decreased audio quality if
the incoming rate exceeds the rate setting.
In Average mod the maximum peak data range depends on the number of
channels and the sampling frequency:
32 kHz
44.1 kHz
48 kHz
Note: The table above applies to 188-byte packet mode. If 204-byte packet mode
is used, you must multiply by a factor of 204/188.
5-74
Sampling
Frequency
1 Mono Channel
192
265
288
D9054 HDTV Encoder Intstallation and Operation Guide
Required TS Capacity (kbit/s)
Stereo (2 Channels)
384
530
576
4038938 Rev A