On 18 May 2011 18:40, robert bristow-johnson wrote:
>
> On May 18, 2011, at 5:28 AM, Vadim Zavalishin wrote:
>
>>> As far as I can tell there are only two state variables, v1 and v2,
>>> and also their previous values v1z and v2z. I'm not sure that the
>>> input v0 and its previous value count as
On May 18, 2011, at 5:28 AM, Vadim Zavalishin wrote:
As far as I can tell there are only two state variables, v1 and v2,
and also their previous values v1z and v2z. I'm not sure that the
input v0 and its previous value count as state in this sense, but I'm
not really up with the lingo, so pleas
I was recently made aware by a friend of mine Urs Heckmann that the
KHN / SVF as we know it is just a special case of a "leapfrog" filter,
The 2-pole SVF as a block diagram is actually particular case of the
controllable canonical form of continuous time LTI system, which is
essentially a cont
Hi Vadim,
I was just listing the standard analog way which can be done easily
just with one more opamp:
notch = high + low
peak = high - low
but you are right, you can build a peaking version in a variety of ways.
I was recently made aware by a friend of mine Urs Heckmann that the
KHN / SVF as
You can find more of Tim's work here:
https://ccrma.stanford.edu/~stilti/papers/
His Thesis is exceptional, I highly
recommend giving it a look.
cheers,
-Brian
On May 16, 2011, at 12:42 PM, "Ross Bencina" wrote:
> Vadim Zavalishin wrote:
>> Somewhere I recently found a reference to an article
allpass = 1 - 2*bandpass = (g^2-g*k*s-s^2)/(g^2+g*k*s+s^2)
Sorry
allpass = 1 - 2*bandpass = (g^2-g*k*s+s^2)/(g^2+g*k*s+s^2)
of course
--
Vadim Zavalishin
Senior Software Developer | R&D
Tel +49-30-611035-0
Fax +49-30-611035-2600
NATIVE INSTRUMENTS GmbH
Schlesische Str. 28
10997 Berlin, Germ
low = v2/v0 = (g^2)/(g^2 + g*k*s + s^2)
band = v1/v0 = (g*s)/(g^2 + g*k*s + s^2)
high = (v0 - k*v1 - v2)/v0 = (s^2)/(g^2 + g*k*s + s^2)
notch = (v0 - k*v1)/v0 = 1 - (g*k*s)/(g^2 + g*k*s + s^2)
peak = (v0 - k*v1 - 2*v2) = (-g^2 + s^2)/(g^2 + g*k*s + s^2)
allpass = 1 - 2*bandpass = (g^2-g*k*s-s^2)
Ahh, thanks Vadim! I was getting my "r" term mixed up with "g", when
actually g = 1/r.
For those interested this is how you solve the circuit equations, all
of which can be written down directly from the diagram I posted
earlier http://dl.dropbox.com/u/14219031/Dsp/sem-1a-linear-svf.jpg and
a coup
Vadim, did possibly get the lp and hp gains swapped in your equations?
With my working is should the s^2 numerator term should be for the low
pass output, and the cutoff^2 gain for the high pass output.
H(s) = (gainLP*cutoff^2 + gainBP*cutoff*s +
gainHP*s^2)/(cutoff^2+k*cutoff*s+s^2)
No. s^2 i
Vadim, did possibly get the lp and hp gains swapped in your equations?
With my working is should the s^2 numerator term should be for the low
pass output, and the cutoff^2 gain for the high pass output.
Andy
--
cytomic - sound music software
skype: andrewsimper
On 18 May 2011 09:35, Vadim Zava
Hehe, I have no differential equations at all to solve myself and
would be completely lost trying to do so, I don't go anywhere near the
s-domain either. My feet are very very firmly planted in the time
domain that I have trouble understanding all the fancy footwork you
are doing Vadim! My methods
> I'm not too good at electronics, but I'd guess this diagram would imply the
> cutoff gains placed before the integrators in the s-domain block diagram
> (the gain control the current which charges the capacitors, not the
> capacitor's output voltage). This should be pretty much identical to the
>
On 5/18/2011 1:15 AM, robert bristow-johnson wrote:
>
> On May 17, 2011, at 6:27 PM, Ross Bencina wrote:
>
>> robert bristow-johnson wrote:
>>> even though the cookbook yields coefficients for Direct 1 or Direct 2
>>> forms, it's pretty easy to translate that to the state-variable design if
>>
I've often wondered about the relationship between the z-plane transfer
function and state variable form. Can anyone recommend a good reference
(book?) that clarifies the relationship between direct form and state
variable form in digital filters?
It's easiest understood in the s-domain. The t
As far as I can tell there are only two state variables, v1 and v2,
and also their previous values v1z and v2z. I'm not sure that the
input v0 and its previous value count as state in this sense, but I'm
not really up with the lingo, so please let me know what they are
meant to be called.
...
v1z
First thing that comes to mind is you might save
a lot of time by contacting Brian at echonest, as
they basically have a big db of musical feature
analysis covering different genres etc.
If you think about dub reggae vs a brass band then
you'll agree its hardly good science to assume a one
size
I'm trying to discover any work about long-term average spectra of speech and
music. For speech, I found "Some remarks on the average speech spectrum" at
http://www.speech.kth.se/prod/publications/files/qpsr/1964/1964_5_4_013-014.pdf
which is work done in 1964 using the so-called "chorus" method w
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