Cisco D9054 Installation And Operation Manual page 130

Setting Up the Layer II Audio Input,
3. Set the encoding Mode.
You may select Stereo, Joint Stereo, Dual Channel, or Single Mono.
Dual Channel gives the best stereo quality.
In some cases you use Stereo or Joint Stereo instead as these two modes may
optimize the sound quality. Stereo channels may "borrow" bits from each other
thus utilizing the available bandwidth. Joint stereo encodes high frequencies
with insignificant stereo contents as mono thus utilizing the bandwidth for
stereo contents.
Hint: Do Not use Joint stereo audio coding if you want to transfer matrixed
sound (i.e., Dolby Surround). Use Stereo instead. If you use Joint stereo, part of
the phase information which is essential for re-creating the surround channel
information disappears.
4. Select in the Input Type field whether your audio input is Digital, Embedded,
or Dolby-E Decoder.
The D9054 HD Encoder inputs the signal from the Digital input connector in the
selected format. If you select Embedded, the D9054 HD Encoder extracts the
audio embedded in the active HD-SDI video signal of the program.
If you select Dolby-E Decoder, you must set up the Dolby-E Decoder in the
Dolby-E Decoder page. For more information, see Setting up the Dolby-E
Decoder (MCA card only), page 5-85.
Note: Dolby-E Decoder input type is only available if the D9054 Encoder has a
Multiple Channel Audio (MCA) card that is equipped with a Dolby Advanced
Sub-Module (DASM) and a Dolby-E Decoder license.
5. If Digital was selected as the input type above, select one of the four connectors
to use as the Digital audio Input (AES1 to AES4).
6. If Embedded was selected as the input type above, select the Embedded Input.
The HD-SDI video input can contain up to two stereo audio channels each
represented by a packet 1 to 4 and pair 1 or 2. You can transfer up to two of these
channels.
7. If Dolby-E Decoder was selected as the input type above, select which pair of the
Dolby-E output to use as input under Dolby-E Decoder Input (Pair 1 to Pair 4).
5-46
Continued
D9054 HDTV Encoder Intstallation and Operation Guide 4038938 Rev A