[sdiy] Re: FPGA 2-OP FM MIDI Polysynth

Veronica Merryfield veronica.merryfield at shaw.ca
Mon May 4 08:17:05 CEST 2009


On 3-May-09, at 1:56 PM, Aaron Lanterman wrote:

>>> And that was the major incentive for the existence of the DX-7.  
>>> (The DX-7 stored the log(sin()) values in the sine lookup tables,  
>>> and the rest should be obvious.)
>
> The Synergy used a similar-in-spirit trick for additive synthesis  
> that did away with hardware multiplies by using trignometric  
> properties; instead of doing a multiply, you'd look up two phase- 
> shifted sinusoids and add them.

Hal, the designer, maintains that the spectral properties of using  
this technique for amplitude control are different to that when using  
a multiplier.

Veronica






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