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18 MPEG-2 Encoder
Instruction Manual
5.5 "Main > Audio" Screen
The "Main > Audio" screen (Figure 5.5) 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:
1
Data Rate: allows the user to select the audio encoding bitrate in kbps (kilobits per second). The range is 96 to 448
kbps. The factory default value is 192 kbps that supports Audio Coding Mode 2/0:L, R.
2
Delay: allows the user to adjust the audio delay (-300 to 300 ms) to correct for input video/audio sync mismatch.
3
Sample Rate: indicates the input sampling rate of the encoder. The encoder supports 48 kHz sampling rate.
Audio Coding Mode: also referred to as Channel mode. Indicates the number of main audio channels within the
4
encoded bitstream and also indicates the channel format. The unit supports 2/0:L,R= audio is a dual channel (Left &
Right).
5
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 encoder 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.
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Figure 5.5 - "Main > Audio" Screen
NOTE: See Dolby Encoding guidelines for additional information.
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