[sdiy] FPGA 2-OP FM MIDI Polysynth

[Scott Gravenhorst]

paul.maddox.mail-list at synth.net wrote:
>Scott,
>
>  nice work, how about 4 op FM?
>
>Paul

Hi Paul,

I must admit that I am a total neophyte with FM - so I don't even know what 4 operators
will do sonically/musically.  I'm not particularly interested in nontonal sounds.  The
reason I did 8vFM-2x4 was to get more realistic bell and chime sounds than I get with
simple subtractive methods.  A member of the FPGA-synth list suggested that an FM synth
could be designed so that the little FM generators could be uncommitted to a specific
structure and could be rearranged by software (patch) control.  If I were to go with more
operators, I'd like to approach it that way - but that will take some thinking.  8vFM-2x4
has a fixed structure which is simpler to implement.  I'd first like to take it to 16
voices as a 2-OP so that it's more useful (no fun when voice stealing stops a bell sound
that is still ringing out).

>Quoting Scott Gravenhorst <music.maker at gte.net>:
>
>> http://www.fpga.synth.net/pmwiki/pmwiki.php?n=FPGASynth.8vFM-2x4
>>
>> Four 2 operator FM sound generators per voice, 8 voices (total of 64 NCOs).
>>  Sound sample and source code for Spartan-3E Starter Kit.
>>
>> The FPGA in this design is not even half full.  Next step will be to bump
>> it up to 16 voices of polyphony.
>>
>> -- ScottG
>> ________________________________________________________________________
>> -- Scott Gravenhorst
>> -- FPGA MIDI Synthesizer Information: home1.gte.net/res0658s/FPGA_synth/
>> -- FatMan: home1.gte.net/res0658s/fatman/
>> -- NonFatMan: home1.gte.net/res0658s/electronics/
>> -- When the going gets tough, the tough use the command line.
>>
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>
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-- ScottG
________________________________________________________________________
-- Scott Gravenhorst
-- FPGA MIDI Synthesizer Information: home1.gte.net/res0658s/FPGA_synth/
-- FatMan: home1.gte.net/res0658s/fatman/
-- NonFatMan: home1.gte.net/res0658s/electronics/
-- When the going gets tough, the tough use the command line.