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

Ian Smith taciturn_unquiet at hotmail.com
Wed Apr 15 17:52:30 CEST 2009


Eric- 
Yeah, I've heard "Psychobabble". Very nice bell work there. I need to give it a listen on my studio headphones though.
The analog comment was because, to me at least, digital usually sounds like samples and this is... I dunno, it just sounds so rich and warm...
You've made me want to try my hand at digital synthesis now.
-Ian

----------------------------------------
> Date: Wed, 15 Apr 2009 08:37:40 -0700
> From: ebrombaugh1 at cox.net
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] ARM/FPGA synth - now with 100% more audio samples
>
> 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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>>
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