[sdiy] Reconstruction Filters

[Tristan]

If you don't want to dynamically change the filter frequency after the note has started, only require 
a small number of frequencies and/or a steep filter with a high number of poles, then then switching 
resistors may be acceptable. But for something like a 4 pole LPF the VCF and DAC might actually 
work out to be less complex and much more flexible.

/Tristan

On Sun, Feb 13th, 2011 at 7:34 PM, Matthew Smith <matt at smiffytech.com> wrote:

> Hi Folks
> 
> As I work through the design of my wavetable oscillator (made some 
> changes, more of that later,) I've hit the reconstruction filter stage.
> 
> I was wondering if this could be an LPF with say 4-6 switched cut-off 
> frequencies (just over 2x top frequency of the uppermost note in the 
> range) controlled by analogue switches, rather than using a VCF and 
> having a DAC output a control voltage per note.
> 
> Is this a practical solution?
> 
> -- 
> Matthew Smith
> 
> Blog: www.smiffysplace.com  Business: www.smiffytech.com
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