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Old 18 October 2016, 19:42   #115
pandy71
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Join Date: Jun 2010
Location: PL
Posts: 1,546
Quote:
Originally Posted by meynaf View Post
I will ignore this - looks too much like personal attack.
This completely not true - this is simple conclusion after your last comments. I never wrote about poor Amiga audio quality and it was not me suggesting that i never hear Amiga.
I'm vaccinated and immune to FUD.

Quote:
Originally Posted by meynaf View Post
Considering what you wrote, the difference should be obvious to the ear.
If the ear, either yours or mine, can't perceive it, then it's just too subtle and not worth talking about in depreciating terms such as those that were written.
Not sure if your ears are different than average human however human auditory system constantly changing and depends even from current weather... lot of factors affecting our perception and as such there is no reference hearing as such it is quite important to me to find which approach to play HQ audio samples is better for Amiga - or oversampled 8 bit with dithering and aggressive noiseshaping or 14 bit quasi-uniformly distributed PCM like current audio.


Quote:
Originally Posted by meynaf View Post
If you want some not subjective way, just make it heard by enough people. Sound quality can't really be measured - you can only measure accuracy but accuracy isn't equal to quality.
OK let assume that you are right and sound quality can't be measured (not true) but audio circuits used for sound reproduction can be measured.
I hope you not suggesting that bad audio circuit with poor measurement results will provide good sound quality - however if you think it is true i will be glad of some examples for such situation.
Accuracy can be measured and indirectly can be used to quality assessment. I hope you not trying to suggest that Amiga is somehow high end audiophile source.

Once again i highly recommend http://www.harman.com/sites/default/...dioScience.pdf -
He (Floyd E. Toole, Ph.D.
Vice President Acoustical Engineering, Harman International Industries, Inc) cover some of things you wrote about measure, science, theory - there is no electronics there but rather sound quality remarks and how subjective testing is complementary to objective, it is nice paper written with simple and understandable language - you may find it interesting.

Quote:
Originally Posted by meynaf View Post
Oh yeah, on PC input. Just the best way to add PC noise to some sound.
Modern PC very frequently outperform even theoretical 14 bit Amiga quality. You can subtract PC input noise, just use well defined high quality source like CD player or DVD (media player) - i can provide you samples with any resolution and sample rate you wish. By simple comparison it will be possible to at least assess if Amiga is worse/same/better than other known source. As a audiophile you probably have plenty high quality sources to use. I would say this rather problem of a good will than technical.


Quote:
Originally Posted by meynaf View Post
It would be better if you get an accelerator for your A500 then use proper replay software.
There is no affordable accelerator for A500 i can buy. Software - do you have any proposal? (i have some hope that your software to avoid any doubts that i'm unfair and trying bias result by my point of view will be used).



Quote:
Originally Posted by meynaf View Post
Seems that, once again, you just isolate the DAC.
(and forget what calibrated output is all about)
Nope and that's what i've wrote about misleading - my point is that every part of circuitry even not directly related with audio will affect audio signal quality, you constantly says that you feed 16 bit samples, and after shifting there is 14 bits (calibrated) of signal and as such from my perspective this translate (your words about 14 bits) to somewhere around 86dB SNR and comparable IMD/THD.


Quote:
Originally Posted by meynaf View Post
You can stop talking with me if you want. All this electronic stuff is off-topic there anyway.
Why i should stop talking with you? I assume you are mature (you 43 me 45) to have sane discussion where we are able to present different point of view, where there is a place for exchanging arguments and where at some point we can discuss some objective data and as a programmer you (i hope) appreciate that 2+2 will give you 4.

Last edited by pandy71; 18 October 2016 at 19:59.
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