Re: Re: Re: query regarding interfacing of ADC/DAC for speech i/p and o/p

Umer-
> I couldn't get your second hint related to single circular ....I/O pointer shifted
> tio each others.So far as your point of not debugging my assignment is concerned,
> let me tell you that after this preliminay set up (just to verify the correct
> working of DSK's CODEC) I have to undergo a detailed course of DSP alongwith DSK
> training. So plz change your mind that i am getting my assignment done from you. If
> you dont help me I will do it after 6 months. I just want to show it to my advisor.
> Otherwise i will just show him the loopback working. I was trying to show him a
> good piece of work by looping it back after some seconds. Also I have the Java
> experiance not for C.So I would be happy if you help me getting it done. Otherwise
> no prob.,,,

Ok ok... something like the code example below. For a sampling rate of 8 kHz, output
will be delayed from input by 4 sec. I only stored left channel. I didn't test the
code.

-Jeff
define #BUFLEN 16384 /* must be power of 2 */
short left, right, inptr, outptr;
short buf[BUFLEN];

inptr = 0;
outptr = BUFLEN-1;

while (TRUE) {

while (!DSK5510_AIC23_read16(hCodec, &left));
while (!DSK5510_AIC23_read16(hCodec, &right));

buf[inptr++] = left;
inptr &= BUFLEN-1;

left = buf[outptr++];
outptr &= BUFLEN-1;

while(!DSK5510_AIC23_write16(hCodec, left));
while(!DSK5510_AIC23_write16(hCodec, right));
}

> Jeff Brower wrote:
>
> Umer-
>
> > Thanks for ur reply. The code snippet that u have mentioned (i.e.
> > loopback) is already working and i hav already tried it out. But I just
>
> > want to store the audio input in some buffer array or any thing else.
> And
> > then I want to loop it back after sometime (in seconds just like after
> > introducing some delay). Please look in to my code to understand wht i
> > am trying to do. This is my first assignment to configure DSK and a
> > preliminary demo (abt which my question is). After that i will start
> > learning DSP concepts and tutorials and manuals of CCS. So kindly help
> > me to get this first step.
>
> I know what you're trying to do, and I know what's wrong with your code.
> But I'm not
> going to debug your assignment for you.
>
> The point of my reply is to show that you are assuming too many steps
> between the
> initial working code, and your objective -- which is a typical student
> error. If you
> go carefully, step-by-step, then you can figure it out. I'll give you 2
> hints: a)
> don't make separate for-loops, and b) use a single, circular buffer with
> input and
> output pointers shifted from each other.
>
> Good luck!
>
> -Jeff
>
> > Umer-
> > >
> > >> So did u find answer to your query? I am really a new comer in
> > >> DSP domain and unknown to working C5510 in detail. I want to read
> > >> audio input from mic and store it.Then i want to play it back to
> > >> headphone.
> > >>
> > >> This is my main():
> > >
> > >First I would try something very simple to verify your DSK board, tool
>
> > >set-up, build options, memory map, and other basic factors are Ok:
> > >
> > >void main() {
> > >
> > >DSK5510_AIC23_CodecHandle hCodec;
> > >Int16 left,right;
> > >
> > > /* Initialize the board support library, must be called first */
> > > DSK5510_init();
> > >
> > > /* Start the codec */
> > > hCodec = DSK5510_AIC23_openCodec(0, &config);
> > >
> > > /* Audio loopback */
> > > while (TRUE) {
> > >
> > > while (!DSK5510_AIC23_read16(hCodec, &left));
> > > while (!DSK5510_AIC23_read16(hCodec, &right));
> > >
> > > while(!DSK5510_AIC23_write16(hCodec, left));
> > > while(!DSK5510_AIC23_write16(hCodec, right));
> > > }
> > >
> > > DSK5510_AIC23_closeCodec(hCodec);
> > >}
> > >
> > >This should enable audio loopback -- you should hear whatever is on
> the
> > >inputs. Does that much work? If so, then you can go step-by-step to
> add
> > >the functionality you need, testing each step carefully.
> > >
> > >Also, here is a nice page for generating a sine wave with DSK 5510:
> > >
> > > http://www.tkt.cs.tut.fi/kurssit/3516/exercises/fall05/test_audioIO.c
>
> > >
> > >-Jeff
> > >> void main()
> > >> {
> > >>
> > >> DSK5510_AIC23_CodecHandle hCodec;
> > >> Int16 i,j,k,left,right;
> > >> Int16 input1[8000];
> > >> Int16 input2[8000];
> > >> /* Initialize the board support library, must be called first */
> > >> DSK5510_init();
> > >>
> > >> /* Start the codec */
> > >> hCodec = DSK5510_AIC23_openCodec(0, &config);
> > >>
> > >> /* Generate a 1KHz sine wave for 5 seconds */
> > >> for (i = 0; i < 10; i++)
> > >> {
> > >> for (j = 0; j < 8000; j++)
> > >> {
> > >> /* Read a sample from left channel */
> > >> while (!DSK5510_AIC23_read16(hCodec, &left));
> > >> input1[j]=left;
> > >>
> > >> /* Read a sample from right channel */
> > >> while (!DSK5510_AIC23_read16(hCodec, &right));
> > >> input2[j]= right;
> > >> }
> > >>
> > >> }
> > >> for (i = 0; i < 10; i++)
> > >> {
> > >> for(k=0; k {
> > >> while(!DSK5510_AIC23_write16(hCodec, input1[k]));
> > >> /* Send a sample to the right channel */
> > >> while(!DSK5510_AIC23_write16(hCodec, input2[k]));
> > >> }
> > >> }
> > >> /* Close the codec */
> > >> DSK5510_AIC23_closeCodec(hCodec);
> > >> }
> > >>
> > >> But it is not giving any output. What to do?
> > >> kindly help me where i am going wrong. I will be waiting for ur
> reply
> > >>
> > >> regards,
> > >> Umer
> > >> >
> > >> > hello everybody
> > >> > i m an student doing project "Real time
> > >> > implementation of G.723.1 on TMS320VC5510"
> > >> > right now i am ready with optimised code which is
> > >> > running in CCS simulator by taking i/p from file and
> > >> > putting o/p in2 file
> > >> > but now my next step is to run it in to DSK board for
> > >> > that i have to take i/p from mike and taken o/p from
> > >> > headphone
> > >> > and for that i have to interface adc/dac of that
> > >> > particular board which uses AIC23 as a codec.
> > >> > i tried 2 get some idea from audio project available
> > >> > in TI but not getting the flow as i don't aquant with
> > >> > DSP-BIOS also
> > >> > please any1 sugest me how to proceed or else can
> > >> > anybody send me programme to interface codec withought
> > >> > using DSP-BIOS
> > >> >
> > >> > sorry for long mail
> > >> > waiting for early reply as i have to submit my project
> > >> > bbye
> > >> > Alpana
> > >> > M.E.(GCOEP)
> > >> > Pune
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