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AWESOME explanation video about Digital Audio
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luiz.toniolo
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Image-Line just posted in theur channel this AWESOME "Digital Show & Tell'" video by Monty of Xiph.org, explaining about Digital Audio. It's really worth of watching and pretty well done video. It has everything to do about Audio Myths and DAW engine war's. Have fun!



EDIT: More videos come here: http://xiph.org/video/ (including videos to download for free and with subtitles in different languages for better understanding).

This guy is amazing, he deserves some support via donation.

This message was edited 1 time. Last update was at 05/03/2013 01:28:22

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LMike
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http://forumsarchive.presonus.com/posts/list/34784.page
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luiz.toniolo
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Ouw, sorry about this. Sometimes I guess I should use the search button...

Anyway, its was good intention...
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willowhaus
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Don't apologize - this is fundamental stuff, and an excellent video! I hadn't seen it before you posted it - I was aware of about 98% of it, but I definitely learned a few finer details.
Tarekith
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I haven't seen it before either, very well done.
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One element of the whole process that didn't get any attention in the video is the time it takes to reach 'the one solution'.

With steady repetitive signals like sines and squares there's no clue about the latency because every cycle looks like the last one. Latency isn't really an issue when processing recorded material or when playing a CD, but it is with live audio. Finding that 'one solution' is an iterative process: more iterations yields a better solution. But it also takes more time. Can you see the trade-off coming? Shortcuts (to reduce latency) will yield less than ideal results, especially when there's no redundancy in the data (due to limited bit depth or low sample count).

The "very carefully chosen" experiments also mask the details of how the end result was reached. Take e.g. the square wave experiment. The demonstration suggests that the output signal (with the 'oscillations' on top) was what was actually calculated by DSP. But you would get exactly the same result by running a pure square wave through the same steep output filter as the one on the input (or by lopping off any FFT results over 20.5kHz). So for all we can tell, that what might look to the DSP like a pure square wave (or as samples constituting a pure square wave) was actually treated as a pure square wave and the output filter made it look like it did. Not saying that this is how it went down, just stating that there's more than one possible explanation how certain results can be achieved.

It is always nice to have complex things made simple. Truth is that complex things usually are just that: complex. And theoretical ideal solutions become approx. when a result is needed on time. Still, very informative an nicely done this video

This message was edited 1 time. Last update was at 07/03/2013 17:44:31

LMike
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luiz.toniolo wrote:Ouw, sorry about this. Sometimes I guess I should use the search button...

Anyway, its was good intention...


No need to apologize Luiz I actually wasn't saying ... "search first"... , I only posted the link in case you or others wanted to read the previous comments about the video in the other thread. Maybe I should have added that to avoid the misinterpretation.

Many threads around here are (especially FR's) ... multiplicitous.... so... no bigge.
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AstralAnimal
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Fantastic! Thanx for the videos.
Very informative and very well presented.
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CPhoenix
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I've seen this.

I could watch it multiple times lol
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