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

Jeff-
Actually when i run this code a shrill sound is heard from headphones and then every thing stops. And then sometimes nothing comes out (nothing happens). When i use software delay loop like:

Uint32 delay;
DSK5510_AIC23_CodecHandle hCodec;
Int16 i,sample,left,right;
DSK5510_init();
hCodec = DSK5510_AIC23_openCodec(0, &config);
while(true)
{
/*Read a sample from the left input channel */

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

for(delay=0; delay000000;delay++
{
}

/* Send a sample to the left channel */

while(!DSK5510_AIC23_write16(hCodec, left));

}
In this way it doesn't work and simply nothing happens or no sound. Actually I used that loop from another example of CCS (LED example).In that example it was used to introduce a delay in blinking of LEDs. Is this approach valid? Or I have to go through shifting in arrays only.No other way.

Umer-
>
>> Sorry I was out of town so didn't respond you timely
>> No it is not working....even after outptr=1.....now what to do. Ok just
>> ell me is there any other way..or how can we improve it..
>
>Please explain "not working". What happens?
>
>> .what is the purpose of software delay loop...can't we use it?
>
>I thought that's what you wanted, a long delay between output and input.
>
>-Jeff
>
>> > It was pointed out to me that outptr should be initialized to 1 to get the
>> > full 4 sec delay:
>> >
>> > inptr = 0;
>> > outptr = 1;
>> >
>> > Let me know if it works, or at least gets you closer.
>> >
>> > -Jeff
>> >
>> > ---------------------------- Original Message ----------------------------
>> > Subject: Re: [c55x] Re: Re: query regarding interfacing of ADC/DAC for
>> > speech i/p and o/p From: "Jeff Brower"
>> > Date: Thu, October 12, 2006 7:18 pm
>> > To: "Umer Khan"
>> > Cc: c...
>> > --
>> >
>> > 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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