| just an observation, but why dont you try giving gen8 just one period of the
waveform like gen10 has? does this make a difference? it just seems like you
are comparing two things that arent exactly the same. maybe try
f2 0 2048 8 0 512 1 512 0 512 -1 512 0
also, with you current f2, you dont specify the end point value.
pete
Greg Sullivan - SHL wrote:
> Ok - results.
>
> I used a 4 point sine wave, and heavily down sampled. (like Gabriel
> did). Intuitively, I personally would have agreed with Gabriel -
> Gen08 *does* look "smoother". The peaks are definitely rounder
> with Gen08. However, as surprising as it may seem, upon analysing
> the output with a spectrometer, oscil3 is actually doing
> a better job. The signal to noise ratio is reported to be
> 13.1 dBA for oscil3, and 10.3dBA for gen08. Total Harmonic
> Distortion + Noise (THD+N) for oscil3 is 22.1%, and for gen08 it
> is 30.7%. Again, this is in oscil3's favour.
>
> So I don't think we can say gen08 is better. It is certainly different
> though.
> And oscil3 may even be superior to gen08 if my measurements are valid.
>
> I have again attached my orc & sco files.
>
> The spectral analysis software I am using is SpectraPRO
> from http://www.eskimo.com/~cetacean/software.html
> (unfortunately I only have the demo copy and mine expires
> in about 11 more days. Does anyone know of a cheaper program
> than this one that can do the above noise calculations?)
> Note that I had to paste together multiple cycles in order to
> get a long enough analysis duration for SpectraPRO to work.
> I think it has a bug with very short waveforms. Yes, I *was*
> very careful in my cutting and pasting. :)
>
> Greg.
>
> ORC
> ----
> sr = 44100
> kr = 100
> ksmps = 441
> nchnls = 1
>
> instr 1
> aout oscil3 30000,p4,1
> out aout
> endin
>
> instr 2
> aout oscil 30000,p4,2
> out aout
> endin
>
> SCO
> ----
> f1 0 4 10 1
> f2 0 2048 8 0 128 1 128 0 128 -1 128 0 128 1 128 0 128 -1 128 0 128 1 128 0
> 128 -1 128 0 128 1 128 0 128 -1 128
> i1 0 3 86.1328125
> i2 3.5 3 21.533203125
> e |