Official KolibriOS board
It is currently Sat Apr 04, 2020 2:48 am

All times are UTC+03:00

Post new topic  Reply to topic  [ 16 posts ]  Go to page Previous 1 2
Author Message
PostPosted: Thu Nov 24, 2011 11:50 pm 

Joined: Wed Sep 19, 2007 1:49 pm
Posts: 45
art_zh wrote:
forart.euplease stop lecturing me on the subject I was studying for over 25 years!

...lecturing you ?!?

I've posted this idea here exactly 'cause I perfectly now that asm-devs are *pretty familiar* with clocks, executions x clock, timings, latencies, etc. (I still remember the controversial "realtime-OS" 3ad...)

art_zh wrote:
you better start thinking by your own:

Q: what is CPU clk jitter range? >> A: ~100ps @ 1GHz
Q: what is audio sampling freq? >> A: let's say 44kHz, or ~20,000 times lower than CPU's
Q: can we improve random jitter dividing the frequensy by factor of 20,000? >> A: yes. the Gaussian averaging factor will be sqrt(20000) ~ 150
Q: what the resulting jitter we expect at 44kHz after such division? >> A: less than 1ps (!!)

I know that you all (devs, of course) know *mutch* more than me (I'm just IT high-school graduated in Italy... I've writed a dozen lines of ASM in my life... just a little more than "hello world" !!! Now I "typewrite" some PHP... I'm definitely *not* a developer.)

EDIT: BTW *should be* 24 (or even 32) bits / 192 kHz (note that win7 x64/i5-2500k @ 3.6/4Gb can't in WASAPI mode, at least with foobar).

art_zh wrote:
Q: and what shall we think about this sentence:
one audiophile wrote:
The best sounding one was a cMP²-configured i3, one core disabled and underclocked to optimize the jitter...
A: nonsense.

Q: but, in general, why downgrading CPU can improve audio quality at all?

I don't care about that guy... and honestly I don't like - as CMP author suggests - to use my OS @ 16 bits color depth !

art_zh wrote:
A: it is 100% due to hardware problems: EMI, power spikes, line crosstalks, poor PCB layout etc.

Of course, better electronics produces better results... but "some" improvements could be achieved with a well-calibrated software (read "dedicated OS/distro"), IMHO.

Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 16 posts ]  Go to page Previous 1 2

All times are UTC+03:00

Who is online

Users browsing this forum: No registered users and 1 guest

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Limited