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steveh · 27-09-2015, 11:15

The transport stream that your TiVo receives from Virgin for an HD channel only contains Dolby Digital audio*. It does not contain a separate PCM audio stream. If you choose the PCM option in the TiVo settings then the TiVo will use its internal Dolby Digital decoder to convert that Dolby stream into a PCM stream to send to your AV amp. If you choose the Dolby option then it will instead pass through the Dolby Digital stream to your AV amp to decode instead.

(* Except for those HD channels like BBC News that aren't in Dolby and like the SD channels use MPEG Layer 2 audio instead, which the TiVo will always convert to PCM before sending to your amp. Some also have an additional audio description stream that may not be in Dolby.)

27-09-2015, 11:15	#18
steveh Inactive Join Date: Aug 2004 Posts: 272	Re: PCM or Dolby The transport stream that your TiVo receives from Virgin for an HD channel only contains Dolby Digital audio. It does not contain a separate PCM audio stream.* If you choose the PCM option in the TiVo settings then the TiVo will use its internal Dolby Digital decoder to convert that Dolby stream into a PCM stream to send to your AV amp. If you choose the Dolby option then it will instead pass through the Dolby Digital stream to your AV amp to decode instead. (* Except for those HD channels like BBC News that aren't in Dolby and like the SD channels use MPEG Layer 2 audio instead, which the TiVo will always convert to PCM before sending to your amp. Some also have an additional audio description stream that may not be in Dolby.)