Trying to convert regular audio in PWM audio

[steve]

error: bad argument type - #(#<Sound: #5ace328> #<Sound: #5ace568>)

You're using a stereo track (an array of two sounds).
The SND-AVG function requires a mono sound.

The easy workaround is to split the stereo track to mono (https://manual.audacityteam.org/man/spl ... racks.html)
A better solution is to develop the code to handle stereo tracks. Some hints here: https://wiki.audacityteam.org/wiki/Nyqu ... k_Tutorial

[8bit_coder]

Ah, that makes more sense. Well, I've decided to make a nyquist plugin out of it and this is my code so far:

Code: Select all

;nyquist plug-in
;version 3
;type process
;preview linear
;name "aPWM"
;action "Applying PWM"
;author "me"
;copyright "No copyright"

;control smp "Sample Bias" int "1-1000" 1 1 1000
;control htz "Carrier Frequency" int "1-20480000" 1 1 20480000

(setf bias (snd-avg *track* smp smp op-average))
(osc-pulse htz bias)

however, whatever I set in smp just ends up being the output, and debug doesn't do any help either. I'm planning on making it automatically calculate a reasonable carrier frequency and sample bias.

[steve]

It needs to be a "version 4" plug-in.
There were some important changes between versions 3 and 4. The biggest one being that in version 3 and earlier, the selected sound was passed from Audacity to Nyquist as the variable "S". In version 4, the sound is passed from Audacity to Nyquist as the variable *track*.

Change the second line to:

Code: Select all

;version 4