Down mixing Dolby HD and DTS HD Master into AC3 or DTS 5.1?

[-Jim-]

Hi Gents,

I decided to re-purpose an older (but still 100% functional) Sony receiver to replace a much newer Samsung Blu-Ray HTIB at our family Cabin at Paul Lake. The Samsung, even though it had the latest firmware, struggled with some Disks, and even refused to play others. I paired the receiver with a Sony BX-510 Blu-Ray player I got for a song via a digital coaxial cable for the Audio. (The receiver doesn't have HDMI.)

I've got it all working decently, but I was wondering how does the down mixing Dolby HD and DTS HD Master into AC3 or DTS 5.1 occurs from Blu-Ray Disks that only have one (or the other) of these two HD audio streams along with a stereo PCM track? I'm so used to just plugging in HDMI cables these days, and getting great sound, I've forgotten if there is a lossey 5.1 audio stream "hidden" in these formats that gets transmitted when an digital coaxial (or Optical) sound connection is made? Or do these Blu-Ray players contain a chip to down mix the sound track?

Thanks for the info!

 

[yepimonfire]

Hi Gents,

I decided to re-purpose an older (but still 100% functional) Sony receiver to replace a much newer Samsung Blu-Ray HTIB at our family Cabin at Paul Lake. The Samsung, even though it had the latest firmware, struggled with some Disks, and even refused to play others. I paired the receiver with a Sony BX-510 Blu-Ray player I got for a song via a digital coaxial cable for the Audio. (The receiver doesn't have HDMI.)

I've got it all working decently, but I was wondering how does the down mixing Dolby HD and DTS HD Master into AC3 or DTS 5.1 occurs from Blu-Ray Disks that only have one (or the other) of these two HD audio streams along with a stereo PCM track? I'm so used to just plugging in HDMI cables these days, and getting great sound, I've forgotten if there is a lossey 5.1 audio stream "hidden" in these formats that gets transmitted when an digital coaxial (or Optical) sound connection is made? Or do these Blu-Ray players contain a chip to down mix the sound track?

Thanks for the info!

DTS HD MA is an extension codec. The HD MA part contains all of the missing information from the DTS 5.1 core. With Dolby true HD, most bluray discs have a second Dolby digital track at 448kbps.

If you manually select either DTS or Dolby digital, the BPD converts the audio into pcm, and then encodes it into either DTS or DD at the maximum bitrate, however there is one caveat. Not all BDPs natively support decoding DTS HD MA or TrueHD, since neither are mandatory codecs. One way to find out whether it does or not is see if the player is capable of 7.1 pcm output, if not, it likely only decodes the lossy cores.

Sent from my 5065N using Tapatalk

 

[-Jim-]

Thanks for the refresher. Good Job!