Table 5.14 Audio Input Parameters
Parameter Values Description
Input Format
Uncompressed (LPCM), MPEG Layer II, Dolby
Digital, Dolby Digital Plus, Dolby E, AAC
Sets the input format used by the audio encoder.
Input Source
Off, Mute, Test Tone -18dB, Test Tone -20dB,
Embedded 1 to 8
Sets the source used by the audio encoder. No input is fed
to the encoder if Off is selected. Mute mutes the incoming
audio and encodes silence. Test Tone encodes a 1 kHz
test tone at the given amplitude (referenced to full scale),
Embedded 1 to 8 sets the source to an SDI embedded
audio stream.
Output On Audio Loss No PID, Silence
Specifies the action to take when input is Lost. No PID is
for dropping the audio PID from the stream, Silence is for
encode silence.
NOTE: When No PID is selected, the reference to the PID
is not removed from the Program Map Table, so a
Transport Stream analyzer will indicate a ghost PID in the
output Transport Stream.
Downmix Parameters
Downmix Type Lo/Ro downmix, Lt/Rt downmix Specifies the downmix type.
Downmix metadata
override
Off, on. Specifies the downmix override.
Downmix metadata
reversion mode
If available, maintain last received metatdata
values, otherwise use fixed settings, Use fixed
settings.
Specifies the downmix metadata reversion mode.
Center mix level 0.707 (-3.0 dB), 0.595 (-4.5 dB), 0.500 (-6.0 dB). Specifies the center mix level.
Surround mix level 0.707 (-3.0 dB), 0.500 (-6.0 dB), 0 (-inf dB). Specifies the surround mix level.
Use preferred stereo
downmix if available.
Off, on Enables the preferred stereo downmix, if available.
Audio Status
Audio Locked No, Yes Specifies audio signal is locked.
Downmix active No, Yes Specifies the downmix is active.
Downmix active Lo/Ro downmix, Lt/Rt downmix Specifies the downmix type.
Level (L) 0 Specifies the left channel level.
Level (R) 0 Specifies the right channel level.
PCM Bypass Active No, Yes
Specifies if PCM Bypass is active. Only valid for Dolby E
decoding.
Switchout Active No, Yes
Specifies if switchout is active. Only valid for Dolby E
decoding.
Input Buffer Level 0 Specifies input buffer level.
Input Bitrate 0 Specifies input bit rate (in kbps).
Dolby Digital Sample
Rate
0
Specifies Dolby Digital sample rate in (Hz). Only valid for
Dolby Digital or Dolby Digital Plus decoding.
Input Coding Mode N/A, ??? Specifies if input coding mode is selected.
Resync Count 0 Specifies the resync count.
Bad RC Packets 0
Specifies the number of bad timing packets received by
the audio processor.
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