DSP Device for Guitar Pedal Effect

Fred · 2009-10-26T02:46:54+00:00

I was wondering what DSP chip would be appropriate for a guitar pedaleffect. I need to sample the incoming signal preferably at 96kHzperform a simple numeric function upon each sample and output heresult.

Oct 26, 2009 82 Replies

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JosephKK 16 years ago

(and

$2.50, no

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Actually it can be quite simple: The incoming stream goes into a tiny buffer (about 3 samples), the per sample mapping is looked up from EPROM, the output value is sent to the next thing.

The 22V10 is there control that process.

Yeah, i know that is unclear. But many other topics like state machines get involved quickly and i think trying to discuss them here may distract / bore others here. My real email is in the headers, Robert Baer and a few others have it as well.

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JosephKK 16 years ago

all the

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methods,

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I was figuring on just storing the amplitude conversion data in EPROM. As in a simple state machine.

Implementing the serious math in an FPGA can be faster but seriously more difficult (expensive, i could have to go outside for that).

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markseel 16 years ago

Hi Fred,

I designed and built a DSP board using the Wavefront AL3102 (48 MIPS), the WM8731 CODEC (24 bits/sample, 48 kHz) and an Atmel microcontroller (DSP program loading/storage and control) that will be selling for around $50. It comes in a

20 pin 600 mil DIP package (small!) and consumes 48 mA at 3.6 to 24 volts. It has stereo input/output, 5 low speed ADC inputs (i.e. for pots), 3 digital outputs (i.e. for LED's), and analog and digital 3.3 volt supplies to support external circuitry. It's easy to program and can be loaded (EEPROM) using a serial interface. I have been updating some postings on this at this forum:

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If anyone is interested, has questions or comments/suggestions I'd love to hear about them!

Best Regards, Mark Seel Next Audio, Inc snipped-for-privacy@gmail.com

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