[Audacity-devel] workaround for bug 152

[Steve t. F. <ste...@gm...>]

Bug id=152 http://bugzilla.audacityteam.org/show_bug.cgi?id=152
can be prevented from rearing its ugly head by adding the following line 
to dispprisms.lsp

 344   (defun nyq:biquad (x b0 b1 b2 a0 a1 a2)
+345    (if (< a0 1.0)(error (format T "a0 < 1 in biquad~%"))
 346     (let ((a0r (/ 1.0 a0)))

This is not a fix, just a workaround, but it prevents the worst effects 
of the bug.
I suspect the main bug may be related to dither, but that's beyond me.

Perhaps dispprisms.lsp should contain checking that filters do not 
attempt to operate at frequencies above half the sample rate?


Steve D