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In Reply to: RE: Depends on What Type.............. posted by Tony Lauck on July 16, 2014 at 11:29:39
Thank you, Tony. I was just about to provide that same correction, before I saw your response. I've unsuccessfully attempted to enlighten Todd on how ASRC can reduce playback jitter over the past few years now. Perhaps, you will have success, but somehow, I doubt it.
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Ken Newton
Edits: 07/16/14Follow Ups:
"I've unsuccessfully attempted to enlighten Todd on how ASRC can reduce playback jitter over the past few years now. Perhaps, you will have success, but somehow, I doubt it."
No, I've posted on this subject every few years after Todd makes his claim. Perhaps it will be necessary to work out a simple example of why ASRCs work in theory.
How well ASRCs work in practice is a different question, and there I tend to agree with Todd's subjective comments. For that matter, I've yet to see a commercial SRC (SRC, not ASRC) that will upsample and downsample back to the original format and demonstrate that the Sampling Theorem works to a high level of accuracy, as measured by a deep null. Residual errors at -75 dB or worse tend to be typical, even when tested on sine waves that don't come close to the Nyquist frequency. (My metric is the L-infinity norm, i.e. largest absolute value of the error signal.)
Some audiophiles have complained that changing the low order bit of samples of a 24 bit sound file "completely trashed" the sound. How this can possibly be is a related subject.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
ASRC has become an "obsolete" technology.... To where I'd only respond to explicit queries about it (or "upsampling"). Only few companies still use it in their current digital audio processing products. (It's an option in the Sabre DAC, but I think it isn't utilized in most products with the chip.)So if you want to tout the virtues, have at it. ;-]
My only concern now is on the recording side (CDs mastered from 24/192 using ASRC instead of 147/640 or DSD conversion), not so much the playback side.
Edits: 07/16/14
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