4. the only problem with the filter cross-fade scheme is knowing how
long to wait before you can ping-pong back to the other filter. it's
like you have two filters running simultaneously on the same input
with ostensibly the same coefficients (most of the time) so their
outputs should be
On 3/3/16 7:46 PM, Stefan Sullivan wrote:
I looked into this exact issue a little while ago. I found that my
filters sounded better/worse depending on the biquad topology.
Basically if your gaining your input going into states, then those
states are more likely to be very far off from where
I looked into this exact issue a little while ago. I found that my filters
sounded better/worse depending on the biquad topology. Basically if your
gaining your input going into states, then those states are more likely to
be very far off from where they should be when you change the parameters.
On 3/3/16 7:23 PM, robert bristow-johnson wrote:
6. another form to consider is the Lattice or, if you're doing it in
fixed-point, the Normalized Ladder form. these are all second-order
so they all have the same transfer function and you can calculate
coefficients as a function of Cookbook
so i read Jean Laroche's paper in the previous decade and i forget what
the takeaway was from it besides i thought he had a good model for
describing the non-TI in the LTI. had to do with calculation of the
states in a way that made an equivalent filter but with possibly
unstable
>
> I'm not sure quite how this would work for discrete time? Is the idea to
> interpret them as continuous-time filters for the purposes of the state
> update?
I wasn't really thinking about them as continuous-time filters, but
considering the output as a continuous-time signal. Specifically,
Yeah zeroing out the state is going to lead to a transient, since the
filter has to ring up.
If you want to go that route, one possibility is to use two filters in
parallel: one that keeps the old state/coeffs but gets zero input, and
another that has zero state and gets the new input/coeffs. You
As a simple fix, I would also try just leaving the state alone rather than
zeroing it out. I've done this plenty of times before and it's always
sounded okay for moderate/gradual changes of the coefficients.
As for doing it "correctly" -- I haven't read up on this but my thinking
would go like
Hello all,
pyo 0.7.9 is now available to download on pyo's web site :
http://ajaxsoundstudio.com/software/pyo/
pyo's documentation:
http://ajaxsoundstudio.com/pyodoc/
New objects:
- Exposed internal GUI widgets in the official API. New objects are
PyoGuiControlSlider, PyoGuiVuMeter,
