Comments for Leaflabs http://leaflabs.com Mon, 26 Jul 2010 23:03:57 +0000 http://wordpress.org/?v=2.9.2 hourly 1 Comment on Audio and Guitar effects on Maple! 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.

]]> Comment on Audio and Guitar effects on Maple! 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.

]]> Comment on Audio and Guitar effects on Maple! by okie http://leaflabs.com/2010/07/audio-and-guitar-effects-on-maple/comment-page-1/#comment-275 okie Mon, 26 Jul 2010 03:01:31 +0000 http://leaflabs.com/?p=1137#comment-275 Pete, That's cool. A cutoff between 1.5kHz and 2kHz would be decent for guitar, although I wonder if the harmonics generated on the strike of a string might be attenuated some. I'm building a general audio processing board (not just for guitar effects), so I want to keep the cutoff up higher around 20kHz. I would like to see your filter schematic. You could post it here or email it to me: okie@leaflabs.com Pete,

That’s cool. A cutoff between 1.5kHz and 2kHz would be decent for guitar, although I wonder if the harmonics generated on the strike of a string might be attenuated some. I’m building a general audio processing board (not just for guitar effects), so I want to keep the cutoff up higher around 20kHz. I would like to see your filter schematic. You could post it here or email it to me: okie@leaflabs.com

]]> Comment on Audio and Guitar effects on Maple! by Pete http://leaflabs.com/2010/07/audio-and-guitar-effects-on-maple/comment-page-1/#comment-274 Pete Sun, 25 Jul 2010 18:39:27 +0000 http://leaflabs.com/?p=1137#comment-274 I work with PIC and Atmel based audio processing with very similar boards. I recommend using a 4th order Butterworth filter set between 1500 and 2K. As you know, this has a very strong roll-off with little attenuation of the signal in your low-pass range. I would be very interested in these boards when you get them built with a better filter. I'll even be happy to mail you my filter schematic. I work with PIC and Atmel based audio processing with very similar boards. I recommend using a 4th order Butterworth filter set between 1500 and 2K. As you know, this has a very strong roll-off with little attenuation of the signal in your low-pass range.

I would be very interested in these boards when you get them built with a better filter. I’ll even be happy to mail you my filter schematic.

]]> Comment on The Beaglepede Cometh. by hadley http://leaflabs.com/2010/07/the-beaglepede-cometh/comment-page-1/#comment-273 hadley Mon, 19 Jul 2010 06:05:04 +0000 http://leaflabs.com/?p=1083#comment-273 To David, yeah totally, but that's all I had! I'm going to get a small mic and make a spectrum analyzer [partitioning the space into the 5 LEDs], and then make some more interesting patterns from there. Actually there are about a million things I want the beaglepede to signal, but that's where I'm starting. =] To David, yeah totally, but that’s all I had!

I’m going to get a small mic and make a spectrum analyzer [partitioning the space into the 5 LEDs], and then make some more interesting patterns from there. Actually there are about a million things I want the beaglepede to signal, but that’s where I’m starting. =]

]]> Comment on The Beaglepede Cometh. by x893 http://leaflabs.com/2010/07/the-beaglepede-cometh/comment-page-1/#comment-272 x893 Mon, 19 Jul 2010 05:38:02 +0000 http://leaflabs.com/?p=1083#comment-272 It's a cool. may be use small form factor board based on Atom Intel and more complex algoritm for leds ? It’s a cool. may be use small form factor board based on Atom Intel and more complex algoritm for leds ?

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