About MICrODEC

MICrODEC is a work in progress (and probably always will be). It is an open-source platform for Digital Signal Processing (DSP) that is approachable for those familiar with programming Atmel microcontrollers. For those unfamiliar, we hope its a fun excuse to learn.

The hardware itself is of moderately high quality (44.1ksps, 16bit, stereo, -96dB noise, 3Hz - 18kHz frequency response), and has built in features for use with audio effects (wet/dry mix, feedback, mic./instrument/line level inputs). Because of the high data rate, the MICrODEC does not allow for as much processing time as low-end ADC to PWM style microcontroller audio interfaces, but, with 6 seconds of sample time, plenty of useful functions can be executed in the ~400 free clock cycles per sample. And, at a lower cost in comparison to high-end DSP units, it provides a good platform for sound installations where more than a few units may be required.

Features not yet implemented

The current MICrODEC implementation is fun to use, but there are a number of things that would make it even better.

• Internal USB - There is currently an FTDI cable header onboard, but it would be far more convenient if the case did not need to be removed to take advantage of it.
• Bootloader - Once there is USB, there can be bootloader! This would allow for downloading and trading of MICrODEC programs by those who aren't interested in the details of AVR programming.
• MIDI - An optional MIDI board would allow the MICrODEC to be controlled by external pedals, synths, and computer software. Sample MIDI code has been written and tested, so merely a break-out board is required. Currently, there is only one USART for both MIDI and USB, so a solution to allow for both is needed.
• Arduino Compatibility - Although this would seriously reduce the full power of the processor, it would also allow for a wider user base.
• C Code - The current assembler needs to be ported to C for those who are into such things.

Things to put on this page, or subpages

• information about the processor
• about the codecs
• links to hardware, software revs
• who's in charge of what
• goals and suggestions for the future
• major issues that need to be addressed
• minor issues
• links to artists and recordings using the microdec
• facts and thoughts about software interchangability

Software page by page

(this section to receive more treatment)

AudioInt4.asm

Documentation can be downloaded here

Files: Beta Release

• board image

• schematic image

• board eagle file

• schematic eagle file

• library eagle file

• pcb gerber files

• current firmware