[sdiy] "FM" Synthesis (was Re: Buchla 295 10-band comb filter topology)

[Donald Tillman]

> On Nov 26, 2022, at 9:34 AM, Ben Stuyts <ben at stuyts.nl> wrote:
> 
>> On 26 Nov 2022, at 10:01, Donald Tillman <don at till.com <mailto:don at till.com>> wrote:
>> 
>> I repeat: the big deal about the DX-7 was that they found a way to completely avoid real-time multiplies.
>> 
>> And that includes the envelopes.
> 
> For those interested: Ken Shirriff had a a bunch of blog posts reverse-engineering the DX7 chip:
> https://www.righto.com/search/label/dx7 <https://www.righto.com/search/label/dx7>
Yep.

Here's the original Chowning article:
The Synthesis of Complex Audio Spectra by Means of Frequency Modulation
https://ccrma.stanford.edu/courses/220a/static/jcFM73.pdf <https://ccrma.stanford.edu/courses/220a/static/jcFM73.pdf>

Here's the original Chowning patent (which is basically his article):
US4018121A: Method of synthesizing a musical sound
https://patents.google.com/patent/US4018121A <https://patents.google.com/patent/US4018121A>

And here's the Yamaha DX-7 patent:
US4554857A: Electronic musical instrument capable of varying a tone synthesis operation algorithm
https://patents.google.com/patent/US4554857A <https://patents.google.com/patent/US4554857A>

  -- Don
--
Donald Tillman, Palo Alto, California
https://www.till.com
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