lidnariq wrote:
My point is that, if the different voices are uncorrelated, the N163's sound's channel multiplexing produces an alias of the intended sound at every multiple of the channel repetition frequency.
That was my point too, but there is no way more than one multiple could ever be heard, considering this sound would come at 13kHz for 8 channels, the first overtone at 26kHz could not be human earable. This is not aliasing.
Aliasing is when you try to play a high pitched sound but the sampling rate is too low to achieve it. The fundamental could be right, but the other higher harmonics will alias to lower parasite frquencies. For example if you intend do play the following saw wave :
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
At high pitch and it end up like that :
0, 3, 6, 9, 12, 15, 2, 5, 8, 11, 14, 1, 4, 7, 10, 13, 0, ....
There will be a fake frequency at 1/3 the frequency of the fundamental you want to hear. Neededless to say, this sounds absolutely awful, and I belive it's that what Dish wanted to say.
Having more channels on the N163 means lower sampling rate and thus more aliasing (without a proper filtering, the aliasing will be technically present at even only 1 channel... it just won't be noticeable). At which point aliasing becomes unacceptable depend on the waveform's richness and tolerated signal to noise ration. With a sine wave there won't be any aliasing problem ever, and for waveforms poor in harmonics such as a triangle wave it won't become noticeable.