On Tue, Mar 9, 2010 at 9:15 AM, Dan Kegel <d...@kegel.com> wrote: > On Tue, Mar 9, 2010 at 2:58 AM, Roderick Colenbrander > <thunderbir...@gmail.com> wrote: >> I might be able to measure it using my oscilloscope. Somehow I would >> need to play lets say the left channel 'without' latency and the other >> channel with and compare the two signals. > > Yes, absolutely, but it'd be good to make this measurement easy > to repeat by anybody interested. To do that, let's just loop the > audio output back into the audio input. The user will have to > provide a loopback cable (or, worst case, put his mike right up > to the speaker, and allow for a tiny bit of extra latency > from that).
If sound travels at 340m/s, then a one-second sample is 340m long. A 1ms delay would therefore be 340mm, or 34 cm. Your mic would have to be *quite* far away from the speakers to have a significant impact on the delay, unless I'm missing something. Which is good news, I guess, since it means tests are easier. Hope it goes well :) Have fun, Avery