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At the (DSP Appl. with C6713 and 6416 )book, Dr. Chassaing says in CHP 2 Ex
2.3:

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Hi,
    I'm trying to use the Line out jack on my c6713 and for some reason
it sounds strange. The headphone jack produces the original signal, but
line out almost sounds like a highpass filter or something. Are there
some prameters I need to change to get line out to produce original
audio? Where might I find documentation on this? Any help is appreciated.

Thanks,
Jason

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There is error, I will complete it now 
At the (DSP Appl. with C6713 and 6416 )book, Dr. Chassaing says in CHP 2 Ex
2.3:

Experiment with this project, inputting different signals into each channel and
outputting from each channel using adapters and stereo cable. Verify that you
can select each input and output channel independently.

I have modified the examples code as below:

...
    AIC23_data.channel[LEFT]=input_left_sample();
    AIC23_data.channel[RIGHT]=input_right_sample(); 

	output_right_sample(AIC23_data.channel[RIGHT]);
		output_left_sample(AIC23_data.channel[LEFT]);
...
I think that I assign right input to right output and same for left ones.
But I hear left or right inputs from both sides of headphone.

What is wrong?

Regards

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Jason,

--- "Jason O." <g...@mail.gatech.edu> wrote:

> Hi,
>     I'm trying to use the Line out jack on my c6713
> and for some reason
> it sounds strange. The headphone jack produces the
> original signal, but
> line out almost sounds like a highpass filter or
> something. 
What are you connecting 'line out' to??  Is it 'line
in' of a stereo or sound card??  If you are connecting
to something that does not have a 'line in' you could
have a large enough impedence mismatch that it is
causing the distortion.

> Are there
> some prameters I need to change to get line out to
> produce original
> audio? 
You might try a 'second opinion' by connecting to
'line in' of another device.

mikedunn
> Where might I find documentation on this? Any
> help is appreciated.
> 
> Thanks,
> Jason
>     c...@yahoogroups.com
> 
>  
>

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Hi Jason

The data sheet for the TLV320AIC23 is on the TI site and tells you
about the difference between line and headphone outputs.

To make a long story short the line is for a 10K load (input to an
amp) and the other is for 16 ohms.  Yes, the small DC blocking cap on
the line out will make a highpass filter with headphones.

If you're using the Spectrum Digital DSK you can find the schematics
on the CD that comes with it.  On my PC they got installed at 
D:\ti\docs\pdf\6713_dsk_schem.pd.

You should look at the audio part of the schematics and see the parts
between the IC and the jacks to learn what's there as well as print
the AIC23 data sheet instead of just taking my word for it.

Al

--- In c...@yahoogroups.com, "Jason O." <gtg416b@...> wrote:
>
> Hi,
>     I'm trying to use the Line out jack on my c6713 and for some reason
> it sounds strange. The headphone jack produces the original signal, but
> line out almost sounds like a highpass filter or something. Are there
> some prameters I need to change to get line out to produce original
> audio? Where might I find documentation on this? Any help is
appreciated.
> 
> Thanks,
> Jason
>

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