a little SP0250 data

here is something that I just got from a request on comp.speech about
the part. someone had a 4 page preliminary data sheet on it.

There is just one page. The rest is electrical stuff.

There are 15 parameters each of 1 byte, which are input to pins 3 2 28
27 26 25 24 23 (3 is Most Significant Bit). The bytes are labelled (in
order) C21, C11, Amplitude, C22, C12, Pitch, C23, C13, Repeat, C24, C14,
C25, C15, C26, C16.

The C's are the twelve (reflection?) coefficients, where the MSB is the
sign, 1 = pos.
The amplitude in direct data mode has the 3 MSBs as exponent.
The pitch does not have a sign bit.
Repeat has MSB set to 0, MSB-1 set to V(u), remaining bits the repeat
value. It does not say what V(u) is (there is a bar over the u). It may
be the voiced/unvoiced flag.

Finally there is a description of a byte which may be an alternative to
the amplitude. The MSB is sign 1 = neg, the rest is amplitude. A note
says "exponent from normal mode remains until changed".
Received on Mon Jun 16 17:45:40 1997