[music-dsp] Article: antialiased sine waveform syncing
gasmoa at gmail.com
Tue Jun 9 07:39:57 EDT 2009
On Tue, Jun 9, 2009 at 12:55 PM, Vadim
Zavalishin<vadim.zavalishin at native-instruments.de> wrote:
>> yes, i gathered that too. and since the BLIT is BL, any LTI operation
>> you do to it will result in an output that is likewize BL.
> What's difficult for me to intuitively understand there, is that convolution
> with BLIT in the discrete-time domain doesn't guarantee the "correct
> bandlimitness". In fact one can consider any discrete-time signal as
> "technically bandlimited", since after going through the DAC the sound will
> be definitely bandlimited. What is important is whether the "technically
> bandlimited" signal is identical to what we expect. E.g. an aliasing
> sawtooth sound at the speaker output is still bandlimited, however it is
> bandlimited in an undesired way, that's why we complain.
> In this respect I personally fail to see how "correctly" the signals
> produced by BLOO will be bandlimited, as it seems to me that the method
> should introduce certain artifacts. Ideally I'd like to see a comparison of
> an ideal continuous-time spectrum against a spectrum restored from the
> discrete time signal.
I'm not sure why you fail to understand this considering it's convolution.
As for how to remove artifacts and approximate the continuous-time case
read my response to RBJ's post. If you need a specific formula, there's not one
at the moment unfortunately, as this involves me completing the theory
and i dont have really the time right now.
Seriously. Read my post please.
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