Comments on: Audio and Guitar effects on Maple! http://leaflabs.com/2010/07/audio-and-guitar-effects-on-maple/?utm_source=rss&utm_medium=rss&utm_campaign=audio-and-guitar-effects-on-maple Thu, 24 Nov 2011 13:54:34 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: Bar Fridge · http://leaflabs.com/2010/07/audio-and-guitar-effects-on-maple/comment-page-1/#comment-398 Bar Fridge · Mon, 08 Nov 2010 10:59:33 +0000 http://leaflabs.com/?p=1137#comment-398 guitar amplifiers that are made up of vacuum tubes are expensive but they are cool :: guitar amplifiers that are made up of vacuum tubes are expensive but they are cool ::

]]> By: Styrofoam Sheets  http://leaflabs.com/2010/07/audio-and-guitar-effects-on-maple/comment-page-1/#comment-387 Styrofoam Sheets  Tue, 19 Oct 2010 06:35:46 +0000 http://leaflabs.com/?p=1137#comment-387 guitar amplifiers that are made by fender are the best in my opinion,:, guitar amplifiers that are made by fender are the best in my opinion,:,

]]> By: Matthew Gordon http://leaflabs.com/2010/07/audio-and-guitar-effects-on-maple/comment-page-1/#comment-384 Matthew Gordon Fri, 15 Oct 2010 01:35:47 +0000 http://leaflabs.com/?p=1137#comment-384 Glad to see the Maple being used for audio. Cool stuff! Glad to see the Maple being used for audio. Cool stuff!

]]> By: okie http://leaflabs.com/2010/07/audio-and-guitar-effects-on-maple/comment-page-1/#comment-284 okie Fri, 13 Aug 2010 21:36:11 +0000 http://leaflabs.com/?p=1137#comment-284 The board has seen a lot of improvement in sound quality, and I'll be making another post soon. I'm now getting 16-bits of resolution on the input and output at 100kSPS. Changing C12 from to 22uF cut the noise down a lot, and the added resolution picks up more of the quiet and subtle. poslathian pointed me toward this site that talks about a sweet thing that I'm now using: adding 2 PWM signals in analog with a scaled resistor divider doubles the resolution! I wrote first versions of these functions: harmonizer, ampmod, ringmod, and tremelo. They all eat and return audio signals, each other, and themselves, which is just too much fun. I'll post those and more soon. On a random adventure through signal processing topologies using these effects, I liked this one: signalout = tremelo(tremelo((ringmod(signalin) + harmonize(signalin))/4 + signalin/2)/2 + ampmod(signalin,signalin,knob1)/2); You can only kind of guess what it might sound like without seeing the functions, but I think it illustrates what I'm building. I made this sound with Maple and the audio shield with a microphone and a speaker connected to it: http://dl.dropbox.com/u/42394/okie-thetipsygypsy.mp3 The board has seen a lot of improvement in sound quality, and I’ll be making another post soon. I’m now getting 16-bits of resolution on the input and output at 100kSPS. Changing C12 from to 22uF cut the noise down a lot, and the added resolution picks up more of the quiet and subtle. poslathian pointed me toward this site that talks about a sweet thing that I’m now using: adding 2 PWM signals in analog with a scaled resistor divider doubles the resolution!

I wrote first versions of these functions: harmonizer, ampmod, ringmod, and tremelo. They all eat and return audio signals, each other, and themselves, which is just too much fun. I’ll post those and more soon. On a random adventure through signal processing topologies using these effects, I liked this one:

signalout = tremelo(tremelo((ringmod(signalin) + harmonize(signalin))/4 + signalin/2)/2 + ampmod(signalin,signalin,knob1)/2);

You can only kind of guess what it might sound like without seeing the functions, but I think it illustrates what I’m building.

I made this sound with Maple and the audio shield with a microphone and a speaker connected to it:
http://dl.dropbox.com/u/42394/okie-thetipsygypsy.mp3

]]> By: okie http://leaflabs.com/2010/07/audio-and-guitar-effects-on-maple/comment-page-1/#comment-277 okie Mon, 26 Jul 2010 23:03:57 +0000 http://leaflabs.com/?p=1137#comment-277 Jack, interesting. I looked up companding. First I'm going to try to digital companding with the circuit I have now. Maybe some kind of a noise gate might also help. Jack, interesting. I looked up companding. First I’m going to try to digital companding with the circuit I have now. Maybe some kind of a noise gate might also help.

]]> By: Jack http://leaflabs.com/2010/07/audio-and-guitar-effects-on-maple/comment-page-1/#comment-276 Jack Mon, 26 Jul 2010 16:34:04 +0000 http://leaflabs.com/?p=1137#comment-276 Great. But i think adding a compander circuit will help keeping the noise as low as possible (guitar pickups have huge dynamic range). Almost all digital delay pedals have compander circuits even if it s a digital one. (The early Boss dd3, which have the best souding (according to http://www.analogman.com/boss.htm ), use an analog one). The PT80 delay pedal, famous in the DIY community use a SA571 compander chip (schematic here: http://www.generalguitargadgets.com/content/view/125/26 /). There is also a nice explanation for a good sounding digital pedal (good in filters and out filters). Even if it is said that it is not required (in the explanation pdf), the Rebote2 delay which use the same echo chip as the PT80, but have no compander chip, is well know for having a lot more noise. Great.
But i think adding a compander circuit will help keeping the noise as low as possible (guitar pickups have huge dynamic range). Almost all digital delay pedals have compander circuits even if it s a digital one. (The early Boss dd3, which have the best souding (according to http://www.analogman.com/boss.htm ), use an analog one).

The PT80 delay pedal, famous in the DIY community use a SA571 compander chip (schematic here: http://www.generalguitargadgets.com/content/view/125/26 /). There is also a nice explanation for a good sounding digital pedal (good in filters and out filters).
Even if it is said that it is not required (in the explanation pdf), the Rebote2 delay which use the same echo chip as the PT80, but have no compander chip, is well know for having a lot more noise.

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