[sdiy] interesting patents- Yamaha, Kawai, Ralph Deutsch

[Scott Nordlund]

>>Maybe some of these could find their way into FPGAs...
>
> Heh, they could at that. Though I've not yet read these patents, I've been working on what I would
> call "waveshaper feedback synthesis" or perhaps "strange sine synthesis" where I have used sine
> oscillators with other than simple feedback to produce more waveshapes than the almost-sawtooth.
>
> A while back I did some experiments with trig identities to "morph" between sin(wt) and sin(2wt)
> and a couple of others. I dropped it because it was mainly underwhelming. Perhaps these patents
> will show me things with more whelm.
>
> -- ScottG


You mean like Chebyshev polynomials? I didn't think they were so interesting either until I learned that they could be added together for combined results.  Of course you can still only properly input a fixed amplitude sine wave, but you can get an arbitrary harmonic series out.  Of course this isn't a huge revelation since you can do the same by using a waveform other than sine and skipping the polynomial waveshaper business...
 		 	   		  
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