[sdiy] Fixed filter bank questions

Oren Leavitt obl64 at ix.netcom.com
Thu May 9 01:17:41 CEST 2019

On 5/8/19 5:50 PM, David G Dixon wrote:
> Having said all that, don't ya just love the idea of these filter banks?
> The idea that something so electronically simple can have such smashing
> sonic results?  This is why I build synthesizers.

My clone of the Moog 914:


That was a fun one to make!

White noise played thru various settings:



- Oren

> -----Original Message-----
> From: Tom Wiltshire [mailto:tom at electricdruid.net]
> Sent: Wednesday, May 08, 2019 3:24 PM
> To: David G Dixon
> Subject: Re: [sdiy] Fixed filter bank questions
>> On 8 May 2019, at 22:04, David G Dixon <dixon at mail.ubc.ca> wrote:
>> FIRST QUESTION:  Is there anything wrong with any of these concepts?
> Nope.
> I'd just flag up that Rod Elliott of the ESP audio pages makes a good
> argument that the use of 1000Hz as the "centre" of audio is misplaced.
> Instead, he goes for 640Hz as the geometric centre based on a ten octave
> range from 20Hz to 20.48KHz:
> http://sound.whsites.net/dwopa2.htm
> Having experimented with this, I've found that I agree with him. It makes a
> good "mid" frequency. Consider it.
>> SECOND QUESTION:  Is there something fundamentally less desirable about
> doing it my way than doing it Yves' way?
> I don't think so. I'd have done it your way too, for the same reasons. It
> seems sensible to reduce the number of expensive caps (these are good
> quality close tolerance film caps you're using for something like this,
> right?!) and use resistors to set the frequency.
> Personally, I wouldn't fret too much about getting the resistor values
> absolutely spot-on, unless you're going to buy 1% tolerance caps too. If the
> caps are 5%, there's not much point stressing to find an exact resistor
> value from the E192 series.
> HTH,
> Tom=
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