Cisco D9054 Installation And Operation Manual page 156

Setting Up the AAC Audio Input,
7. Set the Data Rate in the range from 14 to 320 kbit/s for Stereo channels and from
14 to 160 kbit/s for mono channels.
The recommended data rate depends on the number of channels, i.e., mode, and
whether Spectral Band Replication (SBR) is enabled or not, see Setting Up AAC
Processing, page 5-74.
Type
AAC
Passthrough
AAC + SBR
AAC + SBR
AAC + SBR
AAC
AAC
AAC
For passthrough of AAC you must set the data rate to the peak rate of the
external AAC Encoder. If the data rate of the AAC is the same as the setting in
the D9054 HD Encoder, the audio will be passed through and only the actual
bits in the data stream will be used.
Note: The external AAC Encoder must be locked to the clock of the D9054 HD
Encoder. This can be achieved by connecting the Digital Output of the audio
connector to the external encoder.
8. 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.
9. Set the Digital Level.
You may type a value in the range from -12 to 12 dB.
5-72
Continued
Recommended Data Rate
Range (kbit/s)
14 to 640
14 to 64
24 to 96
64 to 264
32 to 160
40 to 320
96 to 640
D9054 HDTV Encoder Intstallation and Operation Guide
No. of Channels
1
2
6
1
2
6
4038938 Rev A