Re: RT.SYNTH -- anybody tried it?

[Colin Klipsch <cklipsch@radix.net>]

In article <HNSdnT4ixMmh6jvenZ2dnUVZ_tydnZ2d@comcast.com>,
 "Michael J. Mahon" <mjmahon@aol.com> wrote:

> > Catakig adopts a ratio of exactly 47 cycles of the emulated CPU for 
> > every sample of 22,050 Hz audio output.  This gives an effective machine 
> > speed of 1.036 MHz, slightly faster than the Apple II's true speed.
> 
> Then it's a real testament to the accuracy of your filtering
> implementation if DAC522 sounds good, since it (for a couple of
> reasons) must choose the nearest *even* number of cycles, 46.

I have yet to try DAC522 myself under the emulator.  I probably should, 
of course, as it would obviously be a good exercise.  The primary test 
cases I've been using are Electric Duet (which uses a carrier frequency 
of 14 kHz) and S.A.M., the software voice synthesizer (which does its 
magic I know not how, but it's pretty cool).

> Having your sampling run through all possible phase relationships
> with my generated pulses every 2162 cycles would make any inaccuracy
> *very* audible at the "beat" frequency of around 500Hz!

That's a good tip!  I'll have to try that.


-- Colin K.