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RE: How Come No PCM to DSD Stand Alone CD Players Yet?

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In Reply to: RE: How Come No PCM to DSD Stand Alone CD Players Yet? posted by dusted on August 04, 2016 at 15:47:04

Hi,

Any CD-Player with a Delta Sigma DAC (read AKM, Cirrus Logic, NPC, some Philips Chipsets, many Sony Chipsets and others) since the late 1980's to today converts PCM to DSD, most often to DSD128 for more recent Delta Sigma DAC Chipsets, some even do DSD256.

More advanced DAC's (e.g. latest Burr Brown & ESS) use multibit delta-sigma hybrids (with differing implementations) which provide a further advance over single speed DSD.

Now the precise modulators and filters used will differ between different chipsets and different software etc. and so - they will sound different.

Ciao T

At 20 bits, you are on the verge of dynamic range covering fly-farts-at-20-feet to untolerable pain. Really, what more could we need?

Follow Ups:

RE: How Come No PCM to DSD Stand Alone CD Players Yet? - fantja 08:36:26 08/10/16 (0)
Thanks! for sharing- T.
Low-rez DSD conversion a common thing since the 1980's? - genungo 07:39:37 08/10/16 (1)
How come nobody else here seems to know about this stuff?
- RE: Low-rez DSD conversion a common thing since the 1980's? - Thorsten 18:11:27 08/10/16 (0)
  Hi,
  
  DSD was developed in part because in the 90's Delta Sigma ADC's (which output "DSD" naturally) and Delta Sigma DAC's (which need a "DSD" input) became common.
  
  With CD the ADC had it's DSD output converted to PCM and the DAC received PCM and had to internally convert to DSD. So you had:
  
  ADC-DS(S) -> Conversion to PCM -> CD -> Conversion to DS(D) -> DAC-DS(D)
  
  You may find this little sidebar to an interview illuminating:
  
  http://www.audiostream.com/content/qa-thorsten-loesch-amrifi-audiostream-addendum-pcm-vs-dsd
  
  As to "Why no-one knows?"...
  
  Well, those "PCM to DSD" converting DAC Chips did not have a big advertisment "Converts PCM to DSD", but instead were called "Mash" (pronounce Mush) by Technics, or "Bitstream" (pronounce Bitscream) by Philips, Pulseflow (pronounce Pulsesslow) by Sony and so on...
  
  So while they actually did "PCM -> 2 -> DSD" in hardware, someone forgot to mention the fact (perhaps because DSD was still a decade away... Hehehe.
  
  :-P
  Ciao T
  
  At 20 bits, you are on the verge of dynamic range covering fly-farts-at-20-feet to untolerable pain. Really, what more could we need?
RE: How Come No PCM to DSD Stand Alone CD Players Yet? - Tidycat1 21:01:17 08/09/16 (0)
I believe that the Gamut CD3 does this (upsampling to 3.8Mhz) from my understanding.
Used price has been $2.5-3K.Very nice stand-alone CD player.
Tom:cat

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