Hello,
The DSK manual and the datasheet for the audio codec do not explicitly
state any "working" frequency range. Infact, in the codec's
datasheet
there are a few DAC and ADC filter response curves which actually go
down to DC without showing any kind of attenuation.
-Meenakshi.
>hi,
>
>yes, those series capacitors are a bit concern..
>you need to check with the dsk manuals to see if there
>is any specifications given for the low frequencies.
>further, you may also look at the aic23 codec data
>sheet itself for the same kind of specifications.
>
>it is very well possible that you may find the answer
>in these docs...
>
>regards,
>Dileepan.
>--- Meenakshi Matai <mmatai@mmat...> wrote:
>
>>Hello,
>>I am working on the DSK5510 board that has the
>>AIC23b audio codec. When
>>I do a simple audio loopback, I see that there is
>>attenuation at the
>>output below 400Hz. The audio output seems to be at
>>a stable maximum
>>value beyond 400Hz. But, between 1Hz to 400Hz, there
>>is a roll-off.
>>Has anybody seen this before? Is this high-pass
>>effect being introduced
>>by the audio codec?
>>On the schematic of the DSK5510 board I do see
>>capacitors (AC coupling)
>>that are connected both at the input and output
>>audio channels. That is,
>>there are caps connected between the audio input
>>jack and the audio
>>input pin of the codec. There are caps also
>>connected between the audio
>>output pin of the codec and the audio output jack. I
>>am not sure if this
>>is causing the high-pass effect?
>>Could you please tell me what is actually causing
>>this? I would be more
>>than happy to try a few things and provide more
>>information if you have
>>a clue.
>>
>>Thanks,
>>Meenakshi.
>>
>>
>>
>>
>>
>>
>>
>
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