Omnia Audio Omnia.9/XE - Manual (Page 68)

AAC Encoder Menu
The AAC Encoder menu allows you to enable or disable the stream, adjust its output gain, enter the
stream’s title, and select the SBR Mode, channel mode, sample rate, bit rate, and audio bandwidth.
• The Title field allows you to enter the stream title displayed to listeners and on public listings, such
as shoutcast.com.
• The Enable control enables or disables the stream. When enabled, the encoder will continually try
to connect to the specified server.
• The SBR (Spectral Band Replication) Mode toggles between Off, On, and Oversampled. We
recommend setting this control to Off (AAC) for bit rates of 192 kbps or higher, On (AAC+) for bit
rates of 96 kbps or lower, and Oversampled for bitrates between 112 and 160 kbps.
• The Channel Mode menu provides a choice between Mono, Stereo, Stereo Independent,
Parametric Stereo, and Dual Channel. We recommend setting this control to Stereo for bit rates
over 40kbps and to Parametric Stereo for bit rates of 40kbps and lower. Mono should be used only
if the program material is mono. Because the Stereo Independent and Dual Channel settings force
the encoder to divide bits equally between the left and right channels instead of allowing it to
allocate the bits as needed, we recommend not using these settings unless you have a specific
reason to do so.
• The Bit Rate menu allows you to choose encoding bit rates between 16kbps and 320 kbps. Your
choice of bit rate settings will significantly influence the audio quality of your stream. However, you
will also need to take other factors into consideration, such as the total amount of bandwidth
available for the stream, the anticipated number of users, your maximum upload speed, and the
download speed limits of your intended users.
• The Audio Bandwidth menu allows you to set the high frequency range of the stream between 8
and 20kHz. Unless you have a specific reason to set the bandwidth manually, we strongly
recommend leaving this control set to Encoder Default.
• The Sample Rate menu will either maintain the global sample rate as set in the Configuration App
or implement a high-quality re-sample to 32, 44.1, or 96kHz.
• The setting of the Gain control is critical. Normally, this control can be left at 0.0. However, there
are times when you will want to reduce the input level into the encoder. For example, if you are
employing a lot of peak limiting and using AAC+ encoding at a low bit rate, there will be peak
overshoots created as a side effect of the bit rate reduction.
The Station Menu - Encoding Menu
68