Post by gfresh April 22, 2010 (1 of 4)
|
|
When I first stumbled across the SACD entry on Wikipedia I found:
1) No mention of filtering (or lack thereof) in the DSD conversion process.
2) The page claimed research had proven that SACD and RBCD were identical (citing Meyer and Moran's paper).
3) A claim that 24/176 PCM and DSD were also proven to be indistinguishable.
http://en.wikipedia.org/wiki/Super_Audio_CD
The entry amounted to saying there was absolutely no sonic value to SACD or DSD (or high res PCM for that matter).
I made some initial changes by adding in an explanation of the DSD conversion process and why a lack of decimation and interpolation filters is preferable in terms of impulse response and sound quality. I also added Robert Haley of the Absolute Sound's critique of Meyer and Moran's ABX tests.
There has to be much more information regarding the benefits of DSD recording and also the popularity of DSD among mastering engineers such as Bob Ludwig and the SACD community.
Can anyone assist me in making the page for complete and better cited?
|
|
|
Post by zeus April 22, 2010 (2 of 4)
|
|
gfresh said:
When I first stumbled across the SACD entry on Wikipedia I found:
2) The page claimed research had proven that SACD and RBCD were identical (citing Meyer and Moran's paper).
3) A claim that 24/176 PCM and DSD were also proven to be indistinguishable.
http://en.wikipedia.org/wiki/Super_Audio_CD
The Wikipedia entry has become a magnet for format warriors, the disaffected, tin-eared etc. I have an excellent Wikipedia client (Articles) for my iPhone which has made use of the resource a real joy. It's just sad that the Super_Audio_CD entry isn't up to the standard of the bulk of articles. Anything you can do to improve the situation would be welcome.
|
|
|
|
|
|
gfresh ... I would be happy to try help, if I can. Please email me. Thanks.
|
|
|
|
|
|
gfresh said:
When I first stumbled across the SACD entry on Wikipedia I found:
1) No mention of filtering (or lack thereof) in the DSD conversion process.
2) The page claimed research had proven that SACD and RBCD were identical (citing Meyer and Moran's paper).
3) A claim that 24/176 PCM and DSD were also proven to be indistinguishable.
http://en.wikipedia.org/wiki/Super_Audio_CD
The entry amounted to saying there was absolutely no sonic value to SACD or DSD (or high res PCM for that matter).
I made some initial changes by adding in an explanation of the DSD conversion process and why a lack of decimation and interpolation filters is preferable in terms of impulse response and sound quality. I also added Robert Haley of the Absolute Sound's critique of Meyer and Moran's ABX tests.
There has to be much more information regarding the benefits of DSD recording and also the popularity of DSD among mastering engineers such as Bob Ludwig and the SACD community.
Can anyone assist me in making the page for complete and better cited?
Dear Gfresh
Spot the subtle difference between your quote and Wikpedia.
quote.
Double-blind listening tests in 2004 between DSD and 24-bit, 176.4 kHz PCM recordings reported that among test subjects no significant differences could be heard.[42] However, DSD advocates and equipment manufacturers continue to assert an improvement in sound quality above PCM 24-bit 176.4 kHz
You will also find
Because of the nature of sigma-delta converters, one cannot make a direct technical comparison between DSD and PCM.
also read
DSD's frequency response can be as high as 100 kHz, but frequencies that high compete with high levels of ultrasonic quantization noise. With appropriate low-pass filtering, a frequency response of 50 kHz can be achieved along with a dynamic range of 120 dB.[1] This is about the same resolution as PCM audio with a bit depth of 20 bits and a sampling frequency of 96 kHz.[
It seem prety clear.
Please also note that the problems with Meyer and Moran is both the interpretation of their findings and the fact that things may have changed since then.Obviously this matters very little if you cannot hear any differences.They are measurable so they DO Exist.
|
|
