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Discussion Groups | TMS320C55x | getting 2 signals at the same time

Technical discussions about the TI C55x DSPs (including the c5501, c5502, c5503, c5507, c5509, c5510 and OMAP5910).

  

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getting 2 signals at the same time - henry low - Mar 19 8:11:53 2007



hi,

i am trying to get 2 conversion of analog signal to digital signal at
the same time..
i am currently using line in for one signal.. is there anyway to get
another one?

thanks..


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Re: getting 2 signals at the same time - Jeff Brower - Mar 19 12:21:06 2007

Henry-

> i am trying to get 2 conversion of analog signal to digital signal at
> the same time..
> i am currently using line in for one signal.. is there anyway to get
> another one?

Is this a DSK card?  A DSK daughtercard?

In engineering, you are expected to document your problem with detailed information in order to
get an answer. 
Otherwise, no will spend time to help you.

-Jeff


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Re: getting 2 signals at the same time - henry low - Mar 22 7:34:33 2007

Hi,

i'm sorry for the unclear information. i am using the dsp board 
vc5510 only. to my understanding the audio line in on the vc5510 board
is a stereo input. so does that mean i can convert 2 input analog
signal using the ADC at the same time to get 2 array of digital signal ?

thanks 
henry
--- In c...@yahoogroups.com, "Jeff Brower" <jbrower@...> wrote:
>
> Henry-
> 
> > i am trying to get 2 conversion of analog signal to digital signal at
> > the same time..
> > i am currently using line in for one signal.. is there anyway to get
> > another one?
> 
> Is this a DSK card?  A DSK daughtercard?
> 
> In engineering, you are expected to document your problem with
detailed information in order to get an answer. 
> Otherwise, no will spend time to help you.
> 
> -Jeff
>


(You need to be a member of c55x -- send a blank email to c55x-subscribe@yahoogroups.com )

Re: Re: getting 2 signals at the same time - Jeff Brower - Mar 22 11:07:12 2007

Henry-

> i'm sorry for the unclear information. i am using the dsp board
> vc5510 only. to my understanding the audio line in on the vc5510 board
> is a stereo input. so does that mean i can convert 2 input analog
> signal using the ADC at the same time to get 2 array of digital signal ?

If this is DSK 5510 card, then:

  -line-in and microphone channels are sampled simultaneously by
   the AIC23B converter (codec) chip on the card

  -you can make two (2) DSK5510_AIC23_read16() calls in sequence
   to obtain the 2 samples

The more efficient way to fill an array is to enable DMA, but I suggest to first get
your initial code working using the basic C code examples.

-Jeff

> --- In c...@yahoogroups.com, "Jeff Brower" <jbrower@...> wrote:
> >
> > Henry-
> >
> > > i am trying to get 2 conversion of analog signal to digital signal at
> > > the same time..
> > > i am currently using line in for one signal.. is there anyway to get
> > > another one?
> >
> > Is this a DSK card?  A DSK daughtercard?
> >
> > In engineering, you are expected to document your problem with
> detailed information in order to get an answer.
> > Otherwise, no will spend time to help you.
> >
> > -Jeff


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