Speex dev - Aug 2004 - fixed point speex on a texas dsp + real time acquizition

hello,
My project is to implemente an audio compression algorhitm on a DSP
TMS320DM642.
I think that SPEEX can be a good choice because fixed-point have been
developed. I would want to know how I can choose the fixed point in the
program
I want to know if it is possible to do a real time acquizition and to
compresse in real time the audio input signal. By example, I have on my
demonstration card an audio linein input. If I send an audio source (PC
sound card output) on this input, does speex will be able to compress
this signal in real time and to store it in a hard disk integrated to
the demonstration card?

TO test that, i would want to send an audio source to my sound card
input and  I would want do the acquizition of  my sound card input and
compress with SPEEX this audio signal and play in the same time the
decoded file SPX in order to measuring performances with an external
audio analyser.
Is it possible?and how can I do that?
Guillaume

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"Do you mean doing that on a DSP, or on a PC (before you do it on
DSP)?"

Yes I want do that with a PC in order to test if  I can encode in real time an
external audio source and then I want to
implemente SPEEX in a dSP.

guillaume

Jean-Marc Valin a écrit :
> > I want to know if it is possible to do a real time acquizition and to
> > compresse in real time the audio input signal. By example, I have on
my
> > demonstration card an audio linein input. If I send an audio source
(PC
> > sound card output) on this input, does speex will be able to compress
> > this signal in real time and to store it in a hard disk integrated to
> > the demonstration card?
>
> Well, I can't comment on the real-time acquisition and hard-drive
> access, since SPeex has nothing to do with that. For real-time encoding,
> it depends on the speed of your DSP (I don't know that model).
>
> > TO test that, i would want to send an audio source to my sound card
> > input and  I would want do the acquizition of  my sound card input and
> > compress with SPEEX this audio signal and play in the same time the
> > decoded file SPX in order to measuring performances with an external
> > audio analyser.
> > Is it possible?and how can I do that?
>
>         Jean-Marc
>
> --
> Jean-Marc Valin
> http://www.xiph.org/~jm/
> LABORIUS
> Université de Sherbrooke, Québec, Canada
>
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> I want to know if it is possible to do a real time acquizition and to
> compresse in real time the audio input signal. By example, I have on my
> demonstration card an audio linein input. If I send an audio source (PC
> sound card output) on this input, does speex will be able to compress
> this signal in real time and to store it in a hard disk integrated to
> the demonstration card?
Well, I can't comment on the real-time acquisition and hard-drive
access, since SPeex has nothing to do with that. For real-time encoding,
it depends on the speed of your DSP (I don't know that model). 
> TO test that, i would want to send an audio source to my sound card
> input and  I would want do the acquizition of  my sound card input and
> compress with SPEEX this audio signal and play in the same time the
> decoded file SPX in order to measuring performances with an external
> audio analyser.
> Is it possible?and how can I do that?
Do you mean doing that on a DSP, or on a PC (before you do it on DSP)?

        Jean-Marc


-- 
Jean-Marc Valin
http://www.xiph.org/~jm/
LABORIUS
Université de Sherbrooke, Québec, Canada


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