Re: [music-dsp] Sallen Key with sin only coefficient computation

2014-12-23 Thread Andrew Simper
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

Re: [music-dsp] Sallen Key with sin only coefficient computation

2014-12-23 Thread Andrew Simper
On 24 December 2014 at 08:55, robert bristow-johnson 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 voltage controlled current source, it looks neater to use an OTA sy

Re: [music-dsp] R: Sallen Key with sin only coefficient computation

2014-12-23 Thread Nigel Redmon
> On Dec 23, 2014, at 4:45 AM, r...@audioimagination.com wrote: > > in units of mhos (reciprocal of ohms)? Tragically, the formal name for the mho is Siemens, in keeping with naming units after the principal scientists involved. (Also, it follows from the "Siemens mercury unit".) The tragedy is

Re: [music-dsp] Sallen Key with sin only coefficient computation

2014-12-23 Thread robert bristow-johnson
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 "analy

[music-dsp] R: R: Sallen Key with sin only coefficient computation

2014-12-23 Thread Marco Lo Monaco
Hi Robert, > okay, that acronym could use a little bit of definition: > http://en.wikipedia.org/wiki/Operational_transconductance_amplifier . > we used to just call them "transconductance amplifiers" > (or, more fundamentally, a "voltage-controlled current source") back in the > olden daze. the s

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2014-12-23 Thread Jesus Villena
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Re: [music-dsp] Sallen Key with sin only coefficient computation

2014-12-23 Thread Andrew Simper
> 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 -- dupswapdrop -- the music-dsp mailing list and website: subscription

Re: [music-dsp] Sallen Key with sin only coefficient computation

2014-12-23 Thread Andrew Simper
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 Dixo