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
