Are Dolby Digital Plus and DTS HD new formats that will require recievers or pre/pro to have those decoders to hear the difference over DD/DTS or are they simply expanded spectrums that current pre/pros or recievers can play already ?
They are new lossy surround codecs that need an encrypted connection (HDMI or Firewire) to play at full resolution but they can also be passed via S/PDIF and can be read by regular Dolby Digital and dts decoders as 5.1 downsampled surround...
That is, they are backwards compatible (new format will be played as DD/dts 5.1 on old reciever) but not forward compatible (old reciver without HDMI/firewire inputs cannot play full resolution Dolby Digital Plus or dts-HD)
Yes, it makes sense and obviously to hear the new formats we need recievers or pre/pros that can decode them which none apparently do yet. So, I guess in addition to buying a HD DVD or BD we will be budgeting in a reciever or pre/pro that has those codecs if we want to hear the 'improved' sound.
Originally Posted by ACGarib
Just a quick question - Does anybody know if dolby digital plus and DTS HD sent to an old reciever will be seen as DTS ES discrete and dolby digital EX or will it be only 5.1?
Depends whether the old receiver can decode DTS ES discrete and DD EX. If it can, and the DD + and DTS HD has been encoded with that addittional channel info, then it will decode.
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