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In the Forum: Didital Things
In the Thread: The BSO and Digital Music.
Post Subject: HDCD @ 24/88.2Posted by manisandher on: 4/23/2009
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Firstly, I'd like to make an apology to Mark Donahue - I didn't get his permission to paste his PM to me, and I should have done.
 Romy the Cat wrote: |
| I disagree with Mark that HDCD is beneficial for 88.2kHz/24bit... |
|
But here is something that Mark has given me permission to paste:
"A little information is dangerous. I find it
incredible that people with absolutely no understanding about the technology
and its application feel the need to speak with the authority of an expert.
The HDCD processes "Peak Extension" and
"Low Level Extension" are only available when creating 44.1kHz/16 bit
material. These processes are user selectable and were not used in the creation
of the BSO Classics masters. Further, we have not made a master in our history
that utilized any process that requires
decoding to be played back correctly. Period.
At 88.2 kHz the HDCD process alerts the PMI filter chip
in the DA converter that the material was created with an AD converter with a known
anti-aliasing filter and noise shaping curve. The PMI filter chip can then
utilize a reconstruction filter optimized for the specific AD converter used
for the creation of the master. This process is invisible to all other DA
converters and the HDCD dither/noise shaping is considered to be the dither of
choice for high resolution material."
Mani.
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