The thing you need to stare at is the diagram that is on the top of the DX7. You
might be able to search the Yamaha site for the docs or search around sonic-state or
harmony-central for FM sites. There used to be lots of them. The main thing to
remember is that all of the "oscillators" in the DX series produced only sine waves.
Later systems tried other waveforms. These "operators", as they are called, can be
either a sound generator (carrier) or a modulator. Each operator has a pitch EG and
an amplitude EG. The EGs have 4 levels and 4 rates, much like the UEG. There is
also a scaling processor that can be applied to operators and EGs. The "algorithm"
is the interconnection of the operators as carriers and modulators.
From a historical perspective, Buchla really made the first linear FM oscillators
but it was Chowning at Stanford who really worked it out and Yamaha vigorously
defended their licensed or purchased patents.
Eric
--- "Brousseau, Paul E (Paul)" <
noise@...> wrote:
> My ever haphazardly-cast interest-of-the-week has settled upon FM-- and the
> kind thereof, the DX-7. Does anyone have or know of a DX-7 architecture
> diagram or description? Among other things, I'm wondering about / hoping
> for basic block architecture, the potential oscillator interoperability
> (i.e., FM routing), modulation, and EG functionality.
>
> Anyone have any insight as to why greater-than-2-operator FM synthesis never
> left Yamaha, aside from Clavia's peek in the Nord Lead 3? Or are there
> synths aside from the DX family and the recent FS1R and DX200 that do
> intensive FM?
>
> I are in need of edumacation. :) Thanks!
>
> --PBr
>
>
>
>
>
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