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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: New HD audio format question. posted by gdg on December 22, 2006 at 00:05:54:
This info I got from AVS forums so credit goes to Bob Pariseau for posting most of this info. I guess we will have to wait and see if/when audio CDs start using these new lossless codecs.HDMI 1.1
- Provides up to 8 (7.1) channels of lossless uncompressed PCM audio.
- Provides all pre-HDMI Dolby and DTS formats (5.1/6.1).
- Provides DVD-Audio streaming as PCM.HDMI 1.2
- Adds SACD streaming as proprietary DSD format.HDMI 1.3
- Adds up to 8 (7.1) channels of post-HDMI Dolby and DTS formats (TrueHD, etc.).The new codecs are DESIGNED to work without loss of quality across an HDMI V1.1 link when the player does the decoding. There is no reduction in quality implemented by the player or codec if it discovers the link is V1.1 instead of V1.3. The multiple channels of PCM that come across the V1.1 link are the best the new codecs can produce.
The only thing that V1.3 adds is the ability to send the original, undecoded bitstream format to the receiver for the receiver to decode. Your ability to actually take advantage of this may be limited however. Discs authored in the "advanced content" mode *MUST* be decoded in the player. Most commercial discs are authored this way. The net result is that even with a V1.3 link, and a new receiver with its own decoder for that codec, the decoding still must happen IN THE PLAYER and what comes across the V1.3 link is identical in quality to what would come across a V1.1 link.
Even if decoding does happen in the receiver, what comes out of the codec itself is still the same quality. This is true even if the receiver has a higher internal sampling rate. Such upsampling (which can be applied just as well to a signal coming across the link as PCM) helps insure quality of subsequent processing inside the receiver, but the information coming out of the codec is identical either way.
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Follow Ups
- Output will be via HDMI - Robert Joe 22:04:02 12/26/06 (1)
- Re: Output will be via HDMI - gdg 23:07:29 12/26/06 (0)
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