[Audacity-devel] Speed up Square, no alias generator

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

The "Square, no alias" generator is extremely slow, which appears to
be because the entire waveform is generated by additive synthesis.
Attached is a Nyquist generator plug-in that is much faster generating
alias free square waves, particularly when generating waveforms longer
than 10 seconds.

One would expect a built-in generator to be significantly faster than
a Nyquist implementation, but the Nyquist version achieves a huge
speed boost by generating a wavetable for the waveform, then using the
wavetable to generate the waveform. I presume that this method could
be implemented in C+ to make the "Square, no alias" generator very
substantially faster.

Steve