On 12/23/14 11:36 PM, Andrew Simper wrote:
On 24 December 2014 at 08:55, robert bristow-johnson
r...@audioimagination.com wrote:
the OTAs are there for voltage-controlled gain or, really, a
voltage-controlled resistor to change the tuning of the VCF. from the
datasheet
They are an idealised
Hi Robert,
Everyone on the synth diy list didn't even bat an eyelid at that
diagram, they just said stuff like Thanks and That's very
interesting, I have not seen it done that way before.
It is the way that you can mix the inputs into a Sallen Key filter
that is new. I have checked David Dixon's
completely different inputs, this is not summing three different
output signals.
to clarify I meant to say : this is not summing three output signals
(low, band, high) from the same input signal like you can do with an
SVF
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On 12/23/14 4:43 AM, Andrew Simper wrote:
Everyone on the synth diy list didn't even bat an eyelid at that
diagram, they just said stuff like Thanks and That's very
interesting, I have not seen it done that way before.
i'm not ashamed to point out what i don't know. you can't spell
analysis
PS:
Anyway, please forget about it diagram if it confuses you.
legit circuit diagrams ain't confusing. signal flow diagrams ain't
confusing. mixed metaphors can be confusing. wires are sorta physical
things that you can do Kirchoff's laws on, signal paths are more like
information pipes
On 12/22/14 12:27 AM, Andrew Simper wrote:
I've seen in many Sallen Key circuits people stick the input signal into
various points to generate some different responses, but always the high
pass is only 1 pole.
i haven't seen that with the SK. for HPF, i've only seen it with the the
R's and C's
On 21/12/2014 5:12 PM, Andrew Simper wrote:
and all the other papers (including the SVF version of the same thing I did
a while back) are always available here:
www.cytomic.com/techincal-papers
Actually:
http://www.cytomic.com/technical-papers
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Thanks for spotting the typo Ross!
I've updated the diagram of the filter to be a little prettier in the full
pdf, and I've also uploaded it as a jpg here:
http://cytomic.com/files/dsp/SkfInputMixing.jpg
Andy
-- cytomic -- sound music software --
On 21 December 2014 at 20:56, Ross Bencina
On 12/21/14 1:01 PM, Andrew Simper wrote:
I've updated the diagram of the filter to be a little prettier in the full
pdf, and I've also uploaded it as a jpg here:
http://cytomic.com/files/dsp/SkfInputMixing.jpg
i don't see how one analyzes that circuit since c1 and c2 are not
connected to
On 12/21/14 1:12 AM, Andrew Simper wrote:
Hi Guys,
Something I've had on the backburner for a while, but now I've finished my
new product I've had time to finish.
I've seen in many Sallen Key circuits people stick the input signal into
various points to generate some different responses, but
I've seen in many Sallen Key circuits people stick the input signal into
various points to generate some different responses, but always the high
pass is only 1 pole.
i haven't seen that with the SK. for HPF, i've only seen it with the the
R's and C's swapped. like with
Hi Guys,
Something I've had on the backburner for a while, but now I've finished my
new product I've had time to finish.
I've seen in many Sallen Key circuits people stick the input signal into
various points to generate some different responses, but always the high
pass is only 1 pole. A while
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