@orastron.com>
Date: Mon, May 1, 2023 at 12:53 AM
Subject: Re: Rendering note with dynamic low-pass
filter by cross fading
To: <MUSIC-DSP@lists.columbia.edu>
message -
From: Stefano
D'Angelo <stefano.dang...@orastron.com>
Date: Mon, May 1, 2023 at 12:53 AM
Subject: Re: Rendering note with dynamic low-pass
filter by cross fading
On 2023-04-25, Ariadne Lewis-Towbes wrote:
That said, when modulating an IIR filter such as a biquad (as shown in
your second email's link), you should not need to compute the
z-transform.
I'm wondering about that z-transform as well. How does it factor in,
really? It's true you can utilize
On 2023-04-25, Yisheng Jiang wrote:
I’m trying to render a note that feed into a IIR filter (2-3 poles)
whose cutoff frequency following an envelope generator, and it’s not
possible for me to compute the z-transform parameters every rendering
block..
Is it approximately the same to generate
Forwarded message -
From: *Stefano D'Angelo*
Date: Mon, May 1, 2023 at 12:53 AM
Subject: Re: Rendering note with dynamic low-pass filter by cross fading
To:
Il 26/04/23 05:39, Yisheng Jiang ha scritto:
> To make concrete of what I’m trying to do, here’s a (wip) code example
>
ht
ct it sounds much better than before, I can see the fft graph of the
> piano move to the right and hear it.
>
>
> -- Forwarded message -
> From: Stefano D'Angelo
> Date: Mon, May 1, 2023 at 12:53 AM
> Subject: Re: Rendering note with dynamic low-pass filter b
Il 26/04/23 05:39, Yisheng Jiang ha scritto:
To make concrete of what I’m trying to do, here’s a (wip) code example
https://github.com/yishengjiang99/sf2rend/blob/bacca1bf2092dbd78b1affacac11155b70f1bc55/spin/mk_lpf_fade.js#L29
Sent from my iPhone
On Apr 25, 2023, at 8:37 PM, Yisheng Jiang
Hey Robert,
I somehow missed this. The first link is over my head but the second one
seems simple enough to try out.
On Thu, Apr 27, 2023 at 10:24 PM robert bristow-johnson <
r...@audioimagination.com> wrote:
> > On 04/27/2023 5:51 PM EDT Yisheng Jiang wrote:
> >
> >
> > It took a couple days
> On 04/27/2023 5:51 PM EDT Yisheng Jiang wrote:
>
>
> It took a couple days for your suggestion to sink it (possibly)
>
>
>
> > On Apr 25, 2023, at 9:19 PM, Ariadne Lewis-Towbes wrote:
> >
> > You won't be able to fade between two filtered blocks of complex
> > (non-sinusoidal) input to
> On Apr 27, 2023, at 6:14 PM, Ariadne Lewis-Towbes wrote:
>
> Hi,
>
> Not quite - you can’t iterate linearly through the biquad’s coefficients.
> Instead you have to iterate through the frequency and repeatedly calculate
> the coefficients (a1,2,3 and b1,2,3, depending). this is normally not
Hi,
Not quite - you can’t iterate linearly through the biquad’s coefficients.
Instead you have to iterate through the frequency and repeatedly calculate the
coefficients (a1,2,3 and b1,2,3, depending). this is normally not ~too~
expensive an operation, although that’s all relative.
Ariadne
On
It took a couple days for your suggestion to sink it (possibly)
> On Apr 25, 2023, at 9:19 PM, Ariadne Lewis-Towbes wrote:
>
> Hi,
>
> You won't be able to fade between two filtered blocks of complex
> (non-sinusoidal) input to the same effect as modulating an arbitrary single
> filter's
Yeah that’s a good way to look at it.Sent from my iPhoneOn Apr 26, 2023, at 11:16 AM, N G wrote:A less mathematical way to show why this doesn't quite work: If you have a resonant filter and you want to modulate it from frequency A to frequency B, you would expect that resonant peak to "sweep"
A less mathematical way to show why this doesn't quite work: If you have a
resonant filter and you want to modulate it from frequency A to frequency
B, you would expect that resonant peak to "sweep" from one frequency to the
next. If you instead use two filters/streams and crossfade between them,
Sorry I was unclear in my original email. This is separate from the amplitude
envelope.. I’m talking about a modulating envelope that’s only connected to the
resonant frequency of the filter.. it shifts it by about 1-semitone over the
course of 1 second or so..
Sent from my iPhone
> On Apr
Hey thanks for the feedback. I was worried it might not be the same effect..
By recalc the transform function I meant computing the a0, a1, b0 etc, which
takes a large chunk of my rendering cycle..
In any case I will generate some wav files and see what the outcome is..
Sent from my iPhone
>
Without time to listen to your example Yisheng I'm just voicing a
theoretical/academic take; When it comes to LTI (linear time
invariant) systems order doesn't matter. With time variant systems it
does.
As a very concrete practical example, I made some "rain" weather FX
patches that employ short
Hi,
You won't be able to fade between two filtered blocks of complex
(non-sinusoidal) input to the same effect as modulating an arbitrary
single filter's frequency. That said, when modulating an IIR filter such
as a biquad (as shown in your second email's link), you should not need
to
To make concrete of what I’m trying to do, here’s a (wip) code example
https://github.com/yishengjiang99/sf2rend/blob/bacca1bf2092dbd78b1affacac11155b70f1bc55/spin/mk_lpf_fade.js#L29
Sent from my iPhone
> On Apr 25, 2023, at 8:37 PM, Yisheng Jiang wrote:
>
> I’m trying to render a note that
I’m trying to render a note that feed into a IIR filter (2-3 poles) whose
cutoff frequency following an envelope generator, and it’s not possible for me
to compute the z-transform parameters every rendering block..
Is it approximately the same to generate two pcm streams with the starting and
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