Better converting usb or spdif? - Page 2

abraxalito · 18th July 2012, 06:11 AM

Not to mention less CPU work to do means less power drawn, less power means lower noise = better sound.

Dirk95100 · 18th July 2012, 06:38 AM

The quality of a digital system is only dependant on the quality of the converters nothing else.

erin · 18th July 2012, 07:00 AM

Quote:

Originally Posted by Dirk95100

The quality of a digital system is only dependant on the quality of the converters nothing else.

OK, if you say so.

abraxalito · 18th July 2012, 07:04 AM

Rejection of common-mode noise counts as a quality of a converter.

Dirk95100 · 18th July 2012, 07:11 AM

Quote:

Originally Posted by abraxalito

Rejection of common-mode noise counts as a quality of a converter.

That only goes for the AD part of a digital system.
Because its the receiver that determines the CMRR.

abraxalito · 18th July 2012, 07:12 AM

I wasn't talking about CMRR, so no, it doesn't.

Dirk95100 · 18th July 2012, 07:31 AM

Then what were you talking about?

abraxalito · 07:39 AM

My subject was a DAC with an unbalanced input (SPDIF). Do you think CMRR applies to unbalanced inputs? For a USB DAC, CMRR would only apply to the signal pair, but the grounds are where the problems are with digital systems.

I was talking about what I said - ability to reject CM noise is a desirable quality in a DAC. If you're not clear what CM noise is, Google can be your friend. Here's a link to get you started :

SoundStage! Pete's Place - JPS Labs Superconductor Interconnects: A Technical Discussion (09/1998)

RayCtech · 18th July 2012, 07:39 AM

Quote:

Originally Posted by Dirk95100

The quality of a digital system is only dependant on the quality of the converters nothing else.

Are you sure

If it was as easy as that we all had been listening to music and not bothered to read or write any postings on forums like this

abraxalito · 18th July 2012, 07:42 AM

I'm fairly sure its down to the DAC, but there are qualities of DACs which don't get measured and specified in marketing materials. CM noise rejection is one such, but its nevertheless a crucial parameter. I've seen no DAC that has a measurement to date.

18th July 2012, 06:11 AM	#11
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 62	Not to mention less CPU work to do means less power drawn, less power means lower noise = better sound. __________________ When a measure becomes a target, it ceases to be a good measure. C.A.E. Goodhart

18th July 2012, 07:04 AM	#14
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 62	Rejection of common-mode noise counts as a quality of a converter. __________________ When a measure becomes a target, it ceases to be a good measure. C.A.E. Goodhart

18th July 2012, 07:12 AM	#16
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 62	I wasn't talking about CMRR, so no, it doesn't. __________________ When a measure becomes a target, it ceases to be a good measure. C.A.E. Goodhart

18th July 2012, 07:35 AM	#18
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 62	My subject was a DAC with an unbalanced input (SPDIF). Do you think CMRR applies to unbalanced inputs? For a USB DAC, CMRR would only apply to the signal pair, but the grounds are where the problems are with digital systems. I was talking about what I said - ability to reject CM noise is a desirable quality in a DAC. If you're not clear what CM noise is, Google can be your friend. Here's a link to get you started : SoundStage! Pete's Place - JPS Labs Superconductor Interconnects: A Technical Discussion (09/1998) __________________ When a measure becomes a target, it ceases to be a good measure. C.A.E. Goodhart Last edited by abraxalito; 18th July 2012 at 07:39 AM.

18th July 2012, 07:42 AM	#20
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 62	I'm fairly sure its down to the DAC, but there are qualities of DACs which don't get measured and specified in marketing materials. CM noise rejection is one such, but its nevertheless a crucial parameter. I've seen no DAC that has a measurement to date. __________________ When a measure becomes a target, it ceases to be a good measure. C.A.E. Goodhart


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18th July 2012, 06:38 AM	#12
Dirk95100 diyAudio Member Join Date: Jun 2011	The quality of a digital system is only dependant on the quality of the converters nothing else.

18th July 2012, 07:31 AM	#17
Dirk95100 diyAudio Member Join Date: Jun 2011	Then what were you talking about?

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