Re: DSP System


"David L. Jones" <altzone@xxxxxxxxx> wrote in message
news:1184938708.873308.27310@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Jul 20, 10:32 pm, "Jon Slaughter" <Jon_Slaugh...@xxxxxxxxxxx>
wrote:
"David L. Jones" <altz...@xxxxxxxxx> wrote in
messagenews:1184928958.453879.133330@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx



On Jul 20, 6:05 pm, "Jon Slaughter" <Jon_Slaugh...@xxxxxxxxxxx> wrote:
"David L. Jones" <altz...@xxxxxxxxx> wrote in
messagenews:1184912759.591055.253980@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

On Jul 20, 1:55 pm, "Jon Slaughter" <Jon_Slaugh...@xxxxxxxxxxx>
wrote:
How hard is it to actually implement a DSP system?

I've been looking at the TMS320C6720 and some conversion devices
and
it
seems I can gather all the components needed but I really don't
have a
good
idea about how to go and implement something like that. The pdf's
I've
looked at on TI's don't really go into detail about how to actually
put
something together(atleast the one's I've seen).

All I want to do is take an analog signal, add some digital
filtering(well,
whatever I want once I get into the software side), and output the
signal.

The digital conversion's seems pretty straight forward and I was
plan
on
using something like the PCM1741 and PCM1807 or something similar
for
the
conversion(although I ultimately want to go to 192khz).

I think all I'll need is the converters, memory, and the dsp? (I
don't
think
I'll need a controller?) Is it going to be much harder than just
hooking
all
these up together and then downloading some code to the dsp?

At this point I do not need anything fancy and just want to apply
some
effects like reverb and chorus to a signal for a start. The biggest
problems
at this point is the IC packaging for these devices as most are out
of
my
reach(BGA, for example) for prototyping.

Is such a conceptually simple project out of my ability as a
hobbyist?
Do
I
need to come up with some prototyping schematic and get some pcb's
made
for
prototyping? I'm really not sure how to go about this and I can't
find
any
documents online that can give me some details about the process ;/

Any ideas?
Thanks,
Jon

What you need is a DSP development board. They will usually contain
all you need to get a project like this off the ground - the DSP
chip,
any required memory, a few ADC inputs and DAC outputs etc, many are
targeted specifically for audio use. It's already done for you.
TI have a complete range of them:
http://focus.ti.com/dsp/docs/dspsupporttnp.tsp?sectionId=3&tabId=2079...

They aren't particularly cheap, but it can save you weeks of mucking
around with hardware, when really a project like this is all about
the
software.

There is nothing really special about DSP's, they are essentially
just
a microprocessor with specilised hardware making them faster at math
and signal processing functions than a regular microprocessor or
microcontroller.

I've looked at that but I can justify the expense. Its got, what,
about
20-30$ worth of components and another 20-30$ for the pcb (if that)
yet
they
want 400 for just a starter? If theres something I'm missing that
makes
it
worth it then please let me know about it but it seems like its not
worth
it.

Jon

I forgot to mention that you don't need a DSP for audio processing
these days, many of the 16/32 bit processors on the market can easily
handle it. You might be able to score a processor development kit with
an audio interface for cheaper than the DSP offerings perhaps.

Yes but I think ultimately this is what I want to learn since I have a
lot
of projects I would like to eventually work on that involve signal
processing(all audio stuff). Although I was initially planing on doing it
with the pc, I think it will be much more interesting to do it using a
DSP
processor(and I think it will be more enjoyable if I'm able to put
together
the hardware for it instead of just doing software).

That hardware is essentially the same regardless of whether you use a
micro, DSP, or FPGA with a processor soft core, the only real
difference is in the speed of processing. In fact FPGA's are becoming
very popular these days for DSP processing, with all sorts of DSP
hardware slices built in to the FPGA fabric, that's where the future
seems to be. But that is a much more difficult learning curve than a
DSP processor.


Yes and that is something else I've been wanting to get into ;) DSP's though
just seem more direct at this point and I have all the stuff to do it(just
not necessarily to do it well). Again, the main issue with the DSP seems to
be the documentation. I guess I just need to spend more time reading it
though.

If you write your code portable enough in C, the bulk of he software
will be the same regardless of the hardware used. You can do the
software development on the PC with a sound card and then port it
fairly easily to your DSP chip and dedicated hardware.


True. The majority of the project is standard stuff though so I think the
main issues are the hardware and dsp specific stuff.

I can appreciate wanting to do the hardware aspect yourself though,
have fun!


I hope ;)

Thanks,
Jon


.

Relevant Pages

  • Re: DSP System
    ... reachfor prototyping. ... all you need to get a project like this off the ground - the DSP chip, ... 20-30$ worth of components and another 20-30$ for the pcb yet they ... I forgot to mention that you don't need a DSP for audio processing ...
    (sci.electronics.design)
  • Re: DSP System
    ... reachfor prototyping. ... all you need to get a project like this off the ground - the DSP chip, ... around with hardware, when really a project like this is all about the ... I forgot to mention that you don't need a DSP for audio processing ...
    (sci.electronics.design)
  • Re: DSP System
    ... all you need to get a project like this off the ground - the DSP chip, ... around with hardware, when really a project like this is all about the ... worth it then please let me know about it but it seems like its not worth ... an audio interface for cheaper than the DSP offerings perhaps. ...
    (sci.electronics.design)
  • Re: DSP FAQ Up-to-dateness
    ... That seems like a good piece of hardware to get started with. ... know what you need to get it going on a DSP chip. ... you can move on to doing it all on an FPGA. ... probably underestimated the power of these chips. ...
    (comp.dsp)
  • Re: FPGA C Compiler on sourceforge.net (TMCC derivative)
    ... high-level C developed by a software guy and have it map to hardware as well as it runs on a DSP, well, I just think you'll leave a lot of FPGA peformance on the table. ... We're doing it so we can rapidly infer reliable hardware using a more concise expression than that achieved using HDLs while paying a minimal price in lost potential performance. ... steadily getting more coarse & complex blocks, ...
    (comp.arch.fpga)