[sdiy] ARM/FPGA synth - now with 100% more audio samples

[Eric Brombaugh]

Ian,

Thanks - glad you enjoyed it. I like bell sounds too. Have you ever 
heard the intro to Frou Frou's "Psychobabble"? Some really detailed hand 
bells there - you can almost hear the clapper moving. The 2-op FM used 
here is pretty good at simple bell sounds, but this system needs more 
dynamics for better realism - I'll probably add a simple ASR transient 
generator to the mod index for that. After that, polyphony!

Funny you should say "all sorts of analog" since this is 98% digitally 
generated - the only analog is the CODEC output filter.

Eric

Ian Smith wrote:
> Eric-
> That sounds awesome. Ok, I'm probably a little biased because I like bells and gongs (having played in the church bel choir for a couple years...), but that really sounds great and all sorts of analog.
> Kudos!
> -Ian Smith
> 
> ----------------------------------------
>> Date: Tue, 14 Apr 2009 18:49:19 -0700
>> From: ebrombaugh1 at cox.net
>> To: synth-diy at dropmix.xs4all.nl
>> Subject: [sdiy] ARM/FPGA synth - now with 100% more audio samples
>>
>> I've had a few months to code up a little mono synth on the ARM/FPGA
>> system that I built. You can find a few updates on the website here:
>>
>> http://members.cox.net/ebrombaugh1/synth/armfpga/index.html
>>
>> Basically it's a MIDI controlled 2-op FM synthesizer with an ADSR and a
>> regenerative feedback delay. The ARM processor is responsible for
>> configuring the FPGA and parsing the MIDI data into parameter settings
>> for the synth design.
>>
>> I've made a few audio samples to demonstrate some of the sounds. Find
>> them here:
>>
>> http://www.sdiy.org/kbadc/armfpga/
>>
>> Descriptions:
>>
>> fm.mp3 - this is playing around with the 2-op FM waveshaping. You can
>> hear changes in the mod/carrier ratio as well as the mod index. Note the
>> rather strong clicking as the mod/carrier ratio is changed, while
>> sweeping the index is much smoother.
>>
>> gong.mp3 - this is a high and low gong sound to illustrate the
>> exponential release.
>>
>> delay.mp3 - this is playing around with the regenerative delay /
>> feedback feature.
>>
>> Let me know what you think!
>>
>> Eric
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