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Unit Configuration
Main Tab: Audio Screen
The “Main Tab: Audio” sub-tab (Figure 4) is a “user-configurable” screen where the following parameters associated with
the Dolby® Digital encoded stereo audio are configured and displayed for the audio input under a green header:
Source:
allows the user to select the type of audio input source. Options: Analog, Digital, and HDMI.
Data Rate:
allows the user to select the audio encoding bitrate in kbps (kilobits per second). The range is 96 to 448
kbps. (Factory Default: 192 kbps, which supports Audio Coding Mode 2/0:L, R)
Delay:
allows the user to adjust the audio delay (-300 to 300 ms) to correct for input video/audio sync mismatch.
Sample Rate:
indicates the input sampling rate of the encoder. The unit supports 48 kHz sampling rate.
Audio Coding Mode:
also referred to as Channel mode. Indicates the number of main audio channels within the
encoded bitstream and also indicates the channel format. The unit supports 2/0:L,R = audio is a dual channel (Left &
Right).
Dialog Normalization:
behaves as an audio Automatic Gain Control (AGC) or Dynamic Range Control (DRC). It has
the ability to take different incoming audio levels and normalize them. The ability of the Dialog Normalization depends
on the configuration of the Dynamic Range Control. The unit allows you to adjust the normalization from -1 to -31 dB.
The typical value is -27 dB. This is based on the standard film audio formats which normally are between -25 and
-31 dB.
Dolby Surround Mode:
indicates if the audio is two-channel Dolby or not. Options:
Unspecified: indicates the decoder must determine the audio format by itself.
Disabled: indicates the audio is not encoded in surround mode.
Enabled: indicates the audio is encoded in surround mode.
Line Mode:
allows the user to select the type of Dynamic Range Compression to be applied to signals that will be used
as direct audio feeds into a TV tuner or other receive devices. (Factory Default: “None”)
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Figure 4 - Main Tab: Audio Screen
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