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6345Re: Big signal at 0 Hz even with SR40 is off

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  • Alberto I2PHD
    Oct 1, 2006
      Marco IK1ODO wrote:
      There would be also a peak at 0Hz due to DC 
      imbalance of the ADC inputs, but the ADCs used in 
      24bit souncards have an internal high pass filter 
      cutting under 1 or 2Hz, suppressing that.
        
      Marco is quite right, as demonstrated by these two screen captures. The first is the digitizing process carried on by Adobe Audition, using the onboard AC'97 chipset, with the card input left open. As you can easily see, there is a substantial DC offset produced by the ADC.



      The same chipset produced this strong zero frequency peak, entirely caused by the DC offset :


      73  Alberto  I2PHD

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