- From: Marcus Geelnard <mage@opera.com>
- Date: Thu, 19 Jul 2012 08:48:25 +0200
- To: public-audio@w3.org
Den 2012-07-18 21:13:36 skrev Chris Wilson <cwilso@google.com>: > On Wed, Jul 18, 2012 at 10:45 AM, Peter van der Noord > <peterdunord@gmail.com >> wrote: > >> I would point out that using oscillators for LFOs, et al, you would >> likely want very careful control over when the waveform starts - in >> which >> case, having a separate noteOn method is actually quite useful. >> >> You are right, but the naming is weird since an oscillator itself has >> nothing to do with notes that can be turned on or off. I'd call them >> start() and stop(). >> > > That's already filed as an issue: > https://www.w3.org/Bugs/Public/show_bug.cgi?id=17344. > >> Wouldn't you actually want to set up a sync relationship between two >> oscillators instead? Having to deal with calling a sync method a >> thousand >> times a second seems odd to me. But Chris has probably thought of this. >> >> It's not that odd. Resetting an osc when used as lfo is often done with >> the beat, for example to create temposynced filtersweeps (just listen to >> any dubstep song to hear that effect). While that reset indeed isnt >> called >> thousands times per second, it's an often used (easy and cheap, cpu >> wise) >> soundsynthesis technique to create strange harmonics as well (two oscs >> at >> audible but different frequencies, one of them syncing the other). A >> lot of >> analog and digital oscillators have a sync input for this purpose. >> >> http://en.wikipedia.org/wiki/Oscillator_sync >> > > That's what I was saying - I think you want a gating/trigger input type, > and a separate thing (not just a generic "input") to connect to. I'm > definitely supportive of having sync on oscillators, although you CAN > implement this today (with noteOns). Couldn't a sync be implemented as an a-rate AudioParam? Every positive zero-crossing of the param would reset the phase of the oscillator. /Marcus -- Marcus Geelnard Core Graphics Developer Opera Software ASA
Received on Thursday, 19 July 2012 06:49:13 UTC