Operation Manual

50
Analog Audio Parameters
These parameters are only displayed if Audio Source in Basic Tab – Audio Configuration is set
to Analog Audio. The parameters are:
 Balanced Audio Level: This control is only displayed if the encoder is equipped with a
balanced audio rear I/O panel. It selects the nominal signal level, as follows:
o SMPTE: Nominal level according to SMPTE RP155, typically used in North
America.
o EBU: Nominal level according to EBU R68, typically used in Europe.
The EBU level is 6 dB higher than the SMPTE level.
 Audio Gain L (dB), Audio Gain R (dB): These controls allow an independent gain
adjustment for the left/right audio channels, from -18.0 dB to +18.0 dB, in steps of 0.5 dB.
 Audio Mute L, Audio Mute R: These controls allow muting of the left/right audio
channels.
A/V Sync Adjustment
This parameter can be used to provide a small amount of A/V sync adjustment, for cases where
the A/V sync in the input signal to the encoder is not correct. If, in the input signal, audio is
behind the video, you can use this parameter to compensate for up to 100 milliseconds. Note
that it is only available for MPEG-1 Layer II and AAC-LC encoding; it will not be displayed for
Dolby Passthrough.
 Audio Delay (ms): Use this to compensate for up to 100 milliseconds of audio delay in
the input signal. This setting will advance the audio in relation to the video by the
amount configured.
PMT Information
The PMT Information section has the following parameters:
 Audio Type: determines the audio type in the PMT audio descriptor. This setting has no
actual impact on how the audio is encoded; it only affects its description in the PMT.
The choices are:
o Undefined: no further information. This is the most common setting.
o Clean Effects: indicates that the audio has no language.
o Hearing Impaired: indicates that the audio is prepared for the hearing impaired.
o Visual Impaired Commentary: indicates that the audio is prepared for the
visually impaired viewer.
If the Audio Encoding setting in the Basic Tab – Audio Configuration is set to Dolby
Passthrough, another parameter becomes available in the PMT Information section: