TiVo's PCM audio option, what surround sound formats does it send?

Discussion in 'TiVo Help Center' started by videobruce, Mar 14, 2021.

  1. videobruce

    videobruce OTA is still alive

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    or should I say 'can' it send to a A/V receiver via HDMI?

    Other than PCM being a two channel 'lossless' transmission method, what surround sound formats (Dolby and otherwise) does it send out assuming the program material is in one of those surround formats (not just plain 'stereo' or mono)?

    On my Yamaha RX-V675 A/V receiver, if I use the "Straight" sound program mode (no decoding) it shows 2 active channels.
    When I switch the decoder to "Dolby ProLogic II Movie", it shows all 6 speaker channels active (no sub or center), but it's not obvious if it is just the receiver that is creating it's 'surround' sound, or actually decoding what is being sent from the TiVo (OTA Roamio if it matters).

    IOW's, the long (which seems almost endless) list of Dolby versions;
    https://www.digitaltrends.com/home-...ound-sound-guide-different-formats-explained/
    Is it at least 5.1 that can be decoded for it's internal surround sound decoder(s)?

    Yamaha SS options.png
     
    Last edited: Apr 5, 2021
  2. HerronScott

    HerronScott Well-Known Member

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    The TiVo PCM output is stereo 2-channel output so your receiver is just simulating surround (the manual does say playing 2-channel sources in multichannel).

    Scott
     
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  3. videobruce

    videobruce OTA is still alive

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    Last edited: Mar 19, 2021
  4. HerronScott

    HerronScott Well-Known Member

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    That list is for PCM file formats and not for PCM format data sent via S/PDIF on a digital optical audio/TOSLINK connection. This isn't a TiVo issue.

    S/PDIF - Wikipedia

    S/PDIF (Sony/Philips Digital Interface)[1][2] is a type of digital audio interconnect used in consumer audio equipment to output audio over reasonably short distances. The signal is transmitted over either a coaxial cable with RCA connectors or a fiber optic cable with TOSLINK connectors. S/PDIF interconnects components in home theaters and other digital high-fidelity systems.

    S/PDIF is based on the AES3 interconnect standard.[3] S/PDIF can carry two channels of uncompressed PCM audio or compressed 5.1/7.1 surround sound (such as DTS audio codec); it cannot support lossless surround formats that require greater bandwidth.[4]

    Scott
     
  5. videobruce

    videobruce OTA is still alive

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    Thou I initially didn't state either in my OP (my bad, which I updated), I'm referring to the HDMI audio, not the digital/optical.
     

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