abbey road d enfer

Re: Budget 192khz A/D
« Reply #20 on: March 10, 2021, 01:44:50 AM »
What about noise shaping? This is a 32 bit AtoD so presumably at some point this will be dithered down to 24 bits at which point there is the opportunity to include some noise shaping. Usually this is arranged to improve the S/N in the audio band at the expense of higher noise out of band. Fine if you want to make your specs look good but bad news if you are looking to see significantly beyond the audio band.

Cheers

Ian
I believe that is the subject of the quote in the ESS board datasheet.
"The ES9822 PRO has an Ultra-Low Noise Floor Bandwidth of 200kHz"
http://www.esstech.com/files/1816/0767/3501/ES9822PRO_DS_brief_v0.2.6.pdf
I read it as "the noise spectrum is shifted above 200k".
Who's right or wrong is irrelevant. What matters is what's right or wrong.
Star ground is for electricians.


Re: Budget 192khz A/D
« Reply #21 on: March 10, 2021, 07:56:10 PM »
Im in two minds about signing the NonDis agreement with ESS , if I cant refer to any of the data here for the purposes our discussion its all a bit pointless  :(

Rocinante

Re: Budget 192khz A/D
« Reply #22 on: March 10, 2021, 11:04:50 PM »
Another consideration is the BEIS adds. I've been wanting to use his pcb/kits for awhile as the sp ed cs are great. Well worth looking into. At least he isnt a Ross Collins.
If there's a harder way to do this, I haven't found it yet.

Re: Budget 192khz A/D
« Reply #23 on: March 11, 2021, 09:01:07 AM »
I did have a look at the Beis A/D , down sides are for your 150 euro you dont get any USB connectivity or I2s for that matter ,also your limited to 192khz .
For starters I might just get the 39.99 DIYINHK 384khz i/o board ,then get a few of the cheaper A/D i2s boards like the PCM1802/1808(ebay) and WM8782 from Audiophonics.fr . Of course in terms of noise and distortion none of those boards give state of the art performance , but they might have good enough bandwidth upto 80khz or more .
Dedicated audio ADC's often tail off the frequency response well before FS/2 , for the vast majority of music recording purposes thats no problem , but when for instance we want to look at  resonances in small audio transformers response upto or above 100khz is a major plus.

abbey road d enfer

Re: Budget 192khz A/D
« Reply #24 on: March 11, 2021, 10:20:49 AM »
when for instance we want to look at  resonances in small audio transformers response upto or above 100khz is a major plus.
OTOH, I've never had any issues with transformers that resonate at more than about 60kHz. I've never seen it consequential to the audio quality or EMI/RFI.
Who's right or wrong is irrelevant. What matters is what's right or wrong.
Star ground is for electricians.

Rocinante

Re: Budget 192khz A/D
« Reply #25 on: March 15, 2021, 12:15:22 AM »
DAC doesn't seem to be a problem IME. The AD on the other hand...
I have optical inputs via a MOTU 2408MK3 which I use solely as a bridge for my ADAT and SMUX converters so the BEIS works for me but with so few reviews I am hesitant. Currently I have a LUCID and RME AD-2 using optical. BEIS seemed convinced that his AD-24 would work with the MOTU.
In my case I need them tied together via clock and adat.
Still i will continue watching this thread with interest.
Do you need more than 192k?
If there's a harder way to do this, I haven't found it yet.

Re: Budget 192khz A/D
« Reply #26 on: March 15, 2021, 09:19:05 AM »
Yeah Dac performance appears to be an order of magnitude better than A/D, although the newest A/D convertor chips narrow the gap considderably . 
Ive recently done some multitrackrecording at 96khz and Im really happy with the results , maybe for simple stereo recording I might be tempted to go higher . The main reason Id like to have the facillity of 384 or 768 khz is for use with REW. Ive done a couple of very simple tube preamps , low impedance(in tube terms) ,low noise, high current ,high bandwidth(around 100khz) , it would be nice to have a measurement system better than this so we can fully evaluate all the harmonics and distortion behaviour . I did post an interview with Rupert Neve lately in Brewery , he's of the opinion usable bandwidth upto around 200khz makes a difference in his designs , I guess it greatly depends on source material too .

My main computer interface is a Tc electronic 24D , co-ax ,optical , adat i/o, 2 mic ins, 2 line ins and four outs , upto 192 khz sampling. 
Thanks once again for the interest Rocinante.


 

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