Hi guys,

whether the transition between two close frequencies is so smooth, the transition between distant frequencies is so rough due to the high wavelenght difference. I'm guessing whether exist some technique that can be involved to smooth that transition.
frequency transition.pd

Thanks in advance,
Matteo

with [line] you have a ramp. you could also use two oscillators and blend them (also with [line]).

@deframmentazione-geometrica I must have made this for someone in the past..... so it is probably on the forum somewhere....... sweep-explained.zip
It uses [line~] ...... an audio rate ramp..... instead of [line] which is control rate and which can be too granular for large rapid differences.
Also can be switched to a log sweep which is better suited to our ears.
David.

@deframmentazione-geometrica +1 RE line, line~ as per @Jona & @whale-av, but if you're controlling the frequency of an oscillator or phasor with an audio signal, you can also just low pass filter the controlling signal to smooth out the transition.
portamento.pd

Edit: after reading @solipp's comment below, you may envision me slogging through every patch I've ever written to see how I've been burned by that problem

@deframmentazione-geometrica also see D04.envelope.quartic.

And F09.declickit in the helpfiles for phase-consistency in trade for jitter in the sequence.

clickless-onoff~.pd

EDIT: and D06.envelope.portamento sweeping pitch, not frequency

Problem with low pass filter smoothing is that it doesn't reach to the desired value.
The lower the slew rate, the lower the "resolution" of the output.

@deframmentazione-geometrica

you should use a logarithmic line~ object to adjust the curve as smooth as you want.
On top of that you should apply a Nyquist correction to the output of your oscillator abstraction.
So here you have some imagines how to do that. The Nyquist abstraction is used in the output of the triangle oscillator abstraction as an example. Then the final output can be controlled with a logarithmic line~ object.

OBS : If you need more then one oscillator you can apply this for each oscillator and then use a mixer and then the output of the mixer you use again the same idea. In this way you have an oscillator smooth stage control and a final mixer stage control for extra smoothness.

This is just the simple mono smooth control (no curve adjustment)

The same idea but as a stereo version

Here is with logarithmic smooth control (with curve adjustment)

Here you have a Nyquist correction abstraction

Here you have a triangle oscillator with Nyquist correction

You can also download xline~ which is an object that is doing just that :
https://forum.pdpatchrepo.info/topic/13084/xline-logarithmic-line-object

Hi guys, thank you for all suggestions.

Just a ramp with [line~] doensn't make the job because it produces glissando acting only on the next frequency.
In the F09.declickit example suggested by lacuna about the changing of the center of frequency by adding two cosine, occurs a very smooth transition, very pleasent to hear, involving both previous and next frequency.

ideal transition.pd

But this patch change the center of frequency of a given frequency, I need that smooth transitions to change from/to any frequencies. Any suggestions? Thank you.