On 10/30/13 4:24 PM, Theo Verelst wrote:
For whoever follows this, I thought and worked a bit about the clipping idea, and especially I was thinking about the harmonic behavior of the clipping function of N degree, so i tried using Maxima, and found there are distinct harmonics added to a sine wave passing through it.
just to be clear. the general rule is that an Nth-order polynomial can generate images at frequencies up to the Nth multiple of the frequency of the original baseband image. it is sufficient to oversample by a factor of (N+1)/2 to prevent any of these generated images from potentially folding back into the baseband. e.g. 3rd-order softclipping requires upsampling by a factor of 2. another e.g. 7th-order softclipping requires upsampling by a factor of 4 to avoid any folded aliases from contaminating the original baseband.
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