[sdiy] Analog bandwidth

[Terry Shultz]

Hi Richard,

I would use 48khz as DVDs are more likely to outlast cd's. SD DVD is 48khz , 44.1 is a bother as it requires a separate clk src.

Most dsp's have limited memory, but ASRC can help convert 44.1 / 48khz.

Having built many synths, I think 44.1 or 48k is fine for sampling audio and not missing any real significant information.

DSP is usually not too burdened by Osc. , filters, VCE, etc. code, ASRC can be a bit more intensive.  

More examples can be given if you need examples.

Regards,

Terry

Sent from my iPad

> On Feb 20, 2014, at 8:39 AM, Richard Wentk <richard at wentk.com> wrote:
> 
> Possibly one of those annoying general questions. ;)
> 
> Has anyone actually measured the true signal bandwidth at the output of an analog synthesizer? Any make or model would do. 
> 
> Obviously in theory there's no need to have much happening above 20k. But I'm wondering how true that is in real circuits. 
> 
> Motivation is to consider how much bandwidth DSP systems need to do a good simulation. 
> 
> 44.1k is clearly a very poor representation of the real thing. But I'm wondering how high you really need to go, and how careful you have to be about modelling features like limited opamp gain bandwidth product and possible single pole phase shifts (etc). 
> 
> If there are real differences the usual abstract models of (say) a four-pole filter aren't going to be all that close to the imperfections of the real thing.
> 
> Richard
> 
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