🚀 go-pugleaf

Ronald A. Huizar (rahhelp@rigel.tamu.edu) wrote:
: 
[Text Deleted]
: 
: One problem that I am already see is that the microcontroller I was
: planning to use the MC68HC811E2 can only address about 64K of external
: memory, and we are planning/contemplating storing the message
: digitally. I have not had much DSP, my partner has had more than I,
: but I figure that for the telephone we will need to sample at least
: 6000 Hz (since the phone BW is 30-3000, you remember Nyquist don't
: you). For a 1 minute (kinda long I know) message that will require
: about 3 Meg of memeory. To much for the E2. So I know that the
: microprocessors can handle the amount of memory I would need but I did
: want to have build my own computer first.
: 
Your numbers for the reqd memory sounds high.

         6000 samples/second at 8 bits resolution.  I think 4k/sec is 
              understandable but quality does suffer.
           60 seconds
    --------- 
       360000 about 360k/minute      	

3 meg should give you just over 8 minutes.
64k gives 10 sec. so you still need more memory or real short messages
: 
: Is there some sort of MCU available that can address enough space for
: me to build this device? I have heard about Motorola having a new
: improves MCU that was 32 bits. Is this true, does anyone have any part
: numbers and/or prices.
: 
I have the data books for the larger MCU's from motorola at home and if I 
remember correctly they are compatible with the 68000 line except for about
6-8 functions short and have several added specific to MCU needs. This may 
make it possible to do most of your design and testing on a 68XXX machine
then just port it to your project.

I can get you more info after I get back from COMDEX in a littlr over a WK.
someone else probably can get you the info quicker. you could call Motorola
and they will give you a list of your local distributors. One of them should
GIVE you the databooks if you tell them about your project, esp. if you leave
the student part out. 
you will probably get a lot better price buying a few parts "for design and
 testing purposes" than "What would a price be on one unit?"

Marc Christensen