Am 17.04.2013 22:53, schrieb Kristoff Bonne:
> 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 $5/pcs ...
>
> Well, my opinion on this is that is kind-of depends what the target
> "market" is for what you are making.
Shure. It's always a question for what a device is used.
>
> For me, (besides doing this form myself to learn about digital voice
> and digital communication), the main goal -at this point- is to create
> a solution to allow hams to experiment with digital voice using their
> existing FM equipement, by preference in a package that can also be
> used in a "mobile" enviroment.
> For that purpose, the RPi fits very nicely. It's powerfull enough,
> it's relative cheap and it's relative small.
I agree on that. It can be used as cheap ''Workbench''... Some people
even use it for compiling jobs - prefering a longer waiting time than a
poor performance of productive-used computers...
I'm also havingan RPi and using it as experimental platform (messing up
EUR 30 is not that 'painful' as the own desktop!)
>
> I agree; if you developing your own board and start shopping around
> for equipement, you could probably end up with a device that will be
> cheaper that is cheaper then the pi, however:
> - how much work would it need? hardware developement
Clearly: building a spechial Coec2 decoder is some big business -
propably only achievable for big bu$ine$$...
But an ARM microcontroller (Ti Stellaris series) will be fine, too. It
can run the reference implementation of codec2 without architectural
optimization, as it has a SP-floatpoint unit, too...
For $ 12,99 , it's worth a try...
As most tools are architecture-independent, you can use your Raspberry
Pi for programming it... xD
> - how much software work would it need?
The rPI mastly none... it works with a Debian derivate...
> - would the software be in a form that can easily be ported to other
> platforms?
ARMv7 rev. 11 seems quite performing...
> - would the software be in a form that can easily be understood by
> other people
Shurely, only hardcore hackers can read assembler code for a specified
embedded device...
>
> 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.
Yes.
>
> 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.
Of course, this is a huge advantage. the 26 GPIO pins are pretty useful
when building your on microelectronics...
>
>
>
> 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.
I'm not that experienced... Some here are very, very...
My sophisitcation is mainly in encryption. The Codec2 is mainlya
proliferation for an own project...
>
> 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.
That's always the point, and I can understand the focus on an
easy-to-learn & easy-to-use system like the Pi.
>
> 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!
If you can find some...
>
> 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!
Eeyupp!
-- Netzblockierer
Cryptofon Project - http://cryptofon.net/
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