[PD] Control over audio

[Chris McCormick]

Hi all,

On 7/3/22 7:34 pm, Chris McCormick wrote:
> 1. Make the signal was somewhat robust to volume changes (e.g. if the 
> source volume was not at max it can still be read).
> 2. Make the signal robust o quite a saturated spectrum (e.g. if the 
> source is playing high bandwidth music the signal is still recoverable).
> 3. Make the signal inaudible such that if it goes into a regular mixing 
> desk it doesn't make it sound bad.


Sorry to reply to my own thread but it seems like a "lock-in amplifier" 
might be what I want:

https://en.wikipedia.org/wiki/Lock-in_amplifier

https://cushychicken.github.io/lock-in-amplifier-simulation/

I could put in a low-volume carrier signal up at 18kHz and use a 
"lock-in amplifier" to extract the signal. Can then just gate the signal 
on and off for a few ms for the sync pulse. Will experiment. Any tips on 
implementing this in vanilla Pd are most welcome!


Cheers,

Chris.


-- 
https://mccormick.cx/