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Last Post 04 Apr 2014 12:41 PM by  bradb
Problem with the on board aic3106 CODEC
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John Papanikolaou
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Posts:2


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02 Apr 2014 08:02 AM
    Problem with the on board aic3106 CODEC

    Dear all,

    We are generating stereo sinewave signals on SIMULINK of 1KHz and 2KHz frequencies 
    with a sampling rate of 44.1 KHz using the full range of INT16 values 
    but the signals are generated very very noisy as shown in the attached image from the oscilloscope. We have also tested other frequency, 
    sampling rate and amplitude settings but the same problem exists.

    Is there any suggestion on what we should do to solve this problem?

    thanks in advance,
    John

        
    bradb
    Basic Member
    Basic Member
    Posts:203


    --
    04 Apr 2014 12:41 PM
    John,

    Here is a response from Dominik Hartl at TI from a similar issue.

    "The output signal from the AIC3106 looks ok. The codec architecture is delta-sigma, which pushes (and shapes) quantization noise out of the audio band. What you see here is the high-frequency noise, which is expected and inherent to the design.

    If you hook this up to a speaker, the noise won't be audible due to its high frequency (it will all be shifted above the audio band, e.g. above 20kHz, if you sample at 44.1kHz).

    You can verify this by running the signal through a spectrum analyzer and looking at the result in the frequency domain."

    More information on this issue can be found on the TI e2e forum[1].

    [1] http://e2e.ti.com/support...ers/f/64/t/2489.aspx
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