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- Newsgroups: sci.electronics
- Path: sparky!uunet!unislc!mgc
- From: mgc@unislc.uucp (Marc Christensen)
- Subject: Re: microcontrollers
- X-Newsreader: TIN [version 1.1 PL6]
- References: <1992Nov12.023508.13285@tamsun.tamu.edu>
- Message-ID: <1992Nov12.175414.5193@unislc.uucp>
- Organization: Unisys Corporation SLC
- Date: Thu, 12 Nov 1992 17:54:14 GMT
- Lines: 46
-
- 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
-