🚀 go-pugleaf

Greetings one and all,

In my continuing quest to convert my Explorer beeps to something my Sparc can
use, I've come across some software that will convert a file of 8-bit 8kHz
samples into Sun's "ulaw" format.  Sounds made-to-order, right?  Well, no.
It wants the samples to be in the range -127 to 128, with 0 (the middle) being
silence.  The Explorer seems thinks of these samples as unsigned 8-bit numbers,
with 0 (the bottom) being silence (if I remember correctly, sampling silence
on an Explorer gets a low-volume 60hz hum of samples between 0 and 50 or so.)

So I tried the obvious conversions: 127-n, n-127, ~n, 127-~n, and so on, and
with the order of bits in n reversed, with little luck.  The samples (of
speech, at least) are just barely legible with 127-n (which sounds a lot like
n & 16, meaning, I guess, that about half the samples are incorrect.)

So I'm pretty confused.  Does anyone know what format the TI D/A chip wants?
Does anyone have any suggestions?  (LGO, are you out there...?)

		-- Jamie