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Linear Acoustic LA-5269 Transcoder User Guide Detailed Operation
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SMPTE RP2020 recommends that metadata be inserted on Line 9, but we have
seen a great deal of variation, thus the default is Auto.
4.4 AC-3 Encoder Menu
The Dolby Digital encoder option provides two encoders, the first capable of encoding up
to 5.1 channels and the second capable of up to two channels. Both Dolby Digital (AC-3)
and Dolby Digital Plus (E-AC-3) are supported.
4.4.1 AES Channel Status Bits
• Audio Bit: Controls the audio/non-audio bit of the channel status bits present on En-
coder A and Encoder B outputs. Default in Non-Audio data.
• Validity Bit: Controls the validity bit of the channel status bits present on Encoder A
and Encoder B outputs. Default is Valid.
4.4.2 Transcoder
• Encode Input: Enables the signal from the 9/10 input (from AES or SDI) to be ap-
plied to the transcoder input of the encoder. This signal can be Dolby Digital (AC-3)
or Dolby E if the option is present. Default is Off Now.
• Encoder Config: Sets the encoder to 5.1+2 or 5.1+Transcode. 5.1+2 is the default
mode for PCM inputs, and 5.1+Transcode allows Dolby Digital (AC-3) applied to the
9/10 input to be transcoded to Dolby Digital Plus (E-AC-3). If Dolby E is applied to
9/10, it can be decoded and re-encoded to Dolby Digital or Dolby Digital Plus and
works in either 5.1+2 or 5.1+Transcode modes.
NOTE: When Transcode Mode (5.1 + Transcode) is enabled, BOTH Encoder A and
Encoder B MUST be set to the same Encoder Mode (i.e. Both to DD or DD+)
else transcoding will not function reliably.
4.4.3 Encoder Mode & Metadata
• MD Reversion: Sets the Metadata Reversion Mode between Last Valid and Internal.
Default is Internal and applies to both Encoder A and Encoder B.