6347Re: [softrock40] Re: Big signal at 0 Hz even with SR40 is off
- Oct 1, 2006Alberto I2PHD wrote:
> Marco IK1ODO wrote:The picture of the single stand alone spike is what one of PC's has, the
>> 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
other four have the typical spike with noise going out quite a ways
slowly and meeting the noise floor about 2-3 KHz away.
On most PC's that is a rare item most people don't have that kind of
"Sacred Cows make the best Hamburger!" Don Seglio Batuna
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