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Old 13 October 2016, 10:16   #45
meynaf
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Join Date: Nov 2007
Location: Lyon / France
Age: 44
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Quote:
Originally Posted by pandy71 View Post
But they not work the same as such they can't be used as comparable techniques... at least based on description for https://www.msx.org/forum/developmen...mples-poor-psg - there is no PCM code - there are transition in internal state machine so you not converting sample values but instead you folding waveforms...
Appears you didn't get it. How it works is simple : it finds three 4-bit values for every wanted output level (there are 256), and attempts to remove the level transition "spikes" (due to the fact the cpu is too slow) by choosing in which order the three levels are changed.


Quote:
Originally Posted by pandy71 View Post
Even if you have 65535 samples some of them are lost due overlapping between DAC (6 bit attenuator)
Of course some of them are lost, but not as many as 60000.


Quote:
Originally Posted by pandy71 View Post
Well... not if you have 14 bit DAC then you don't need to calibrate it - if you need calibrate DAC then you no longer have 14 bit...
We do not start with 14 bits ! We start with 16 !


Quote:
Originally Posted by pandy71 View Post
Perhaps we have different perception of noise.
If you care about noise that can't be heard at all, maybe.


Quote:
Originally Posted by pandy71 View Post
Other compnents ?
Things making lots of electromagnetic garbage, like pc cpu.


Quote:
Originally Posted by pandy71 View Post
Measured not on paper... nowadays this is not a problem.
Isolated from any complete computer then measured, doesn't count.
The D/A may be the best in the world, if its output gets parasite signal it won't help.


Quote:
Originally Posted by pandy71 View Post
At a cost of resolution... other factors are also important as such we going back to what started this discussion - 14 bit resolution maybe real life maximum 12 bit accuracy or less.
How many times will i have to repeat you that the resolution isn't 14 bit but 16 ???


Quote:
Originally Posted by pandy71 View Post
Real 16 bit DAC has 16 bit linearity and this is significant difference between 2x 8 bit DAC and 1 16 bit DAC.
Oh, so you mean that our poor 8 bit DAC aren't linear but nowadays 16 bit ones are, even cheapo chinese ones ?
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