[sdiy] Stereo Audio CODEC ICs

[Ingo Debus]

Am 28.01.2006 um 22:45 schrieb Seb Francis:

> Yeah, I assumed as much.  Luckily this is what I want for my  
> application.  I want to keep the sound quality the same while  
> varying the delay time, so I will do this by changing the buffer  
> size in software not the clock rate.

Changing the buffer size is ok if you want a fixed delay. If you want  
to modulate the delay time in real-time for flanging, chorus etc it's  
much better to have separate read and write pointers and change the  
offset between the two (and have a fixed buffer size all the time).  
Imagine what happens when you suddenly increase the buffer size: you  
might play back samples that are hours old, or even uninitialised.

Using two pointers shouldn't be too difficult if the thing is done in  
software.

Ingo