6 Jun
2005
6 Jun
'05
8:10 a.m.
On Monday 06 June 2005 10:04, Alfons Adriaensen wrote:
The most difficult situation is for n nearly equal to
one.
But even this is not really correct if you want precision.
Consider an Fs/4 sine with samples -0.9 -0.9 +0.9 +0.9 -0.9 -0.9 +0.9 etc.
Now what is the (peak) amplitude of this sine ? Not 0.9, but something like
1.27. If you send this signal through a unity gain filter that produces 45
degrees of phase shift, you will get samples at +/- 1.27, and your DAC will
clip.
So even a simle digital peak meter requires interpolation of peaks to
be accurate. I don't know any in the linux world that do this.
Good points.
What kind of interpolation is required to visualize the DAC output of a
sampled waveform?
Gerard