Hi All,
On 17-04-13 21:17, Netzblockierer wrote:
Am 17.04.2013 21:08, schrieb Bruce Perens:
Hi Luis,
The Raspberry Pi would be a good platform for this. We have a demo on
it currently and I've thought about mounting one in a microphone. We
will get around to implementing on lower-priced ARM processors,
probably down to $5. The main requirements are hardware floating
point and the ability to handle tables larger than 64K.
The Raspberry Pi is a computer. There are much cheaper reprogrammable
DSP's/Microcontrollers from TI, that are about $5/pcs ...
Well, my opinion on this is that is kind-of depends what the target
"market" is for what you are making.
For me, (besides doing this form myself to learn about digital voice and
digital communication), the main goal -at this point- is to create a
solution to allow hams to experiment with digital voice using their
existing FM equipement, by preference in a package that can also be used
in a "mobile" enviroment.
For that purpose, the RPi fits very nicely. It's powerfull enough, it's
relative cheap and it's relative small.
I agree; if you developing your own board and start shopping around for
equipement, you could probably end up with a device that will be cheaper
that is cheaper then the pi, however:
- how much work would it need? hardware developement
- how much software work would it need?
- would the software be in a form that can easily be ported to other
platforms?
- would the software be in a form that can easily be understood by other
people
For me, tt's not about creating the smallest possible device or cheapest
option; or the most advanced device. It's about finding a balance
between the amount of work needed to get something done and the price.
For me, the big advantage of the RPi is that it exists, it's easy to
find, it can be expanded pretty easy, there are a lot people using it
(so you can find help for it pretty easy) and it looks not that much
unlike the other platforms out there (say beaglebone, PCduino, ...). It
allows hams to buy the device, build their own expansion board or top of
it and start using it.
Now, don't get me wrong. I have absololutely nothing against all the
other microcontroller, FPGA, ... projects out there and people trying to
develop their own thing. One of the very nice things about the codec2
project is that it seams to bring people together from a very large
scale of experience and background. I would really like to have the
experience and knowledge you guys have.
My point is just, if you look at -say- "hackaday" or websites like that,
most of these projects are done by using a generic platform (RPi,
arduino, pic, ...) and building their own thing "on top of it". It may
not be best device with the best "performance per cent" ratio; but -at
least- it is a device that people can get there hands on.
After all, if the price for a device to do DV over VHF would cost 20
euro, 30 euro or 40 euro, I don't think that will really make that much
of a difference. Most ham-equipement (especially for digital voice
communication) is in a price-range that is at least 5 times that!
But, to be clear, I will surely follow the different uC, FPGA and
DSP-based projects out there! It's great to see all the activiy out there!
73
Kristoff - ON1ARF
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