Re: [PD] Noise in bp-filter

Hi,

I would do it by having multiple filters in parallel, one for each overtone, and mix between their outputs, instead of changing a single filter's parameters (which is problematic).

This would use more CPU power, but [bp~] is pretty cheap.

It would also make possible mixing overtones in different proportions, which may or may not be useful.

Claude

On 18/02/2023 18:42, William Brent wrote:

Did you smooth the frequency changes with a [line~] object or something else before sending to [vcf~]'s 2nd inlet? You can do the same to make gradual transitions for Q changes, but since the Q inlet doesn't take a signal you'll have to use [line] instead.

On Sat, Feb 18, 2023 at 8:19 AM Daniel Martin via Pd-list pd-list@lists.iem.at wrote:

As you say, the problem is that I jump from a frequency to the
next non-continuosly. Is there a way to do that without
interrupting the signal and without noise?
El viernes, 17 de febrero de 2023, 23:52:22 GMT+1, Peter P.
<peterparker@fastmail.com> escribió:


Daniel, can you try the [vcf~] object instead of [bp~]? The noise you
hear most likely happens when you change the filter frequency
non-continuously.

* Daniel Martin via Pd-list <pd-list@lists.iem.at> [2023-02-17 20:15]:
> Dear PD-Users,                         I'm having a problem with
a patch that filters overtones from a sample. I use for that a bp
filter. The center values for frecuency, Q and output volume are
changed according to which overtone one wishes to hear. It is so
configured, that one can select between overtones 3 to 17,
pressing keys d, r, f, t, g, y, h, u, j, i, k, o, l, p and ñ (I
have a spanish keyboard). The problem is when I want to change
between overtones: one hears a noise. I solved that partially by
reducing the output volume of the bp filter to 0, than changing
the filter parameters values and then raising up the volume again
to 1. That works only with adjacent overtones (for ex. overtone 3
to 4 or 3 to 5), but with larger jumps (for ex. 3 to 15), the
noise comes again, the larger the jump, the stronger the noise.