CHANGSTAR: Audiophile Headphone Reviews and Early 90s Style BBS

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Author Topic: Yggdrasil Measurements  (Read 8533 times)

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wnmnkh

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Re: Yggdrasil Measurements
« Reply #60 on: May 18, 2015, 10:26:50 AM »

Oh my god. No thanks

I do spend time at Hydrogen Audio, and have would prefer to avoid Amir for ever.


While he is as stubborn as folks at Hydrogen Audio, it is not wise to dismiss his knowledge on digital audio completely. There are many stuffs to learn from his debates with HA people.
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anetode

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Re: Yggdrasil Measurements
« Reply #61 on: May 18, 2015, 10:40:16 AM »

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Thad E Ginathom

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Re: Yggdrasil Measurements
« Reply #62 on: May 18, 2015, 11:22:44 AM »

While he is as stubborn as folks at Hydrogen Audio, it is not wise to dismiss his knowledge on digital audio completely. There are many stuffs to learn from his debates with HA people.


You may be right, but I still think I'll stick with some other information sources.

Hydrogen audio has a dogma which might not suit many. I find it a useful balance (although I've given up some of fantasy-based audiophoolery stuff I used to hang around) but, personally, I can't live life in the the lab, I want to live it chatting over a drink too, so I like my objective with a dose of subjective and vice versa.

Jitter is something that has always bothered me because I suspect that, in audiophile-land, it gets used often by a lot of people who have no clue what it means or sounds like or what, technically, it is. I'm not talking Changstar: I doubt that there is anyone on this page who doesn't understand jitter far better than I do. But for the ordinary, non-engineer audiophile (like me!) it to to easy to think, wow, flutter, rumble, jitter and start supposing stuff that may, or may not, be true.

There are some sample files on hydrogenaud.io, with various levels of applied jitter. Whether one uses DBT with them or not (I didn't) it is interesting to get, at last, actual samples of actual jitter. I know that I had to go some way up the various intensities before I could hear it, but I do not make any claims other than personal preference, based on my own hearing, which is getting, according to the audiograms, quite bad.

I also understand that training and experience can enable people to detect digital artifacts: a necessary part of the skills of those working with digital audio,  lossy file formats, etc.
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atomicbob

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Re: Yggdrasil Measurements
« Reply #63 on: May 18, 2015, 01:05:23 PM »

Thanks..
Jitter improved indeed even more .
Should you ever have time to make some 'cold' measurements again the jitter part and crossover parts would be most interesting.

Unless I calculated incorrectedly the ENOB is about 18 bits, which isn't bad at all.


Yes, starting over with the yggdrasil having cooled for at least 24 hrs is in the plan. It may not occur for a few months as I have a short but intense set of tasks in my queue at the corporate gig near term.
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firev1

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Re: Yggdrasil Measurements
« Reply #64 on: May 18, 2015, 05:50:55 PM »

Even if talking about any of Stereophile measurements, these jitter measurements are really the best I've seen from usb ever. For the imaging test, it would be nice to superimpose a 19khz 44.1ksps tone measurement on top of the wideband response.
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aive

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Re: Yggdrasil Measurements
« Reply #65 on: May 22, 2015, 07:12:58 AM »

Been reading around the internets lately trying to learn about DACs, filters, up sampling, etc and came across an exact interpolation process. I.e. time domain -> FFT -> zero pad FFT -> inverse FFT resulting in up sampled time domain signal (exact interpolation values and keeping of original samples) as opposed to estimated interpolation samples based on accuracy of FIR filters.

Key advantages are the process:
- Keeps original samples
- Exact interpolation (bit perfect?)

Sound familiar?

I ran some basic/simple code to confirm the maths and it seemed to work well based on random number generated waveforms. I think Schiit managed to figure out how to implement this process in a DSP, batched process maybe?

Additional info here:
http://www.dspguru.com/dsp/howtos/how-to-interpolate-in-time-domain-by-zero-padding-in-frequency-domain
http://dsp.stackexchange.com/questions/14919/upsample-data-using-ffts-how-is-this-exactly-done

Anyone seen this implemented in audio DACs before? I don't have a Yggy myself (yet) and am thinking to upsample with this process on the PC and run my DAC in NOS (although I'm not sure if the M7 runs true NOS based on my previous waveform observations)...
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