Arduino-Due-DSP

The SAM3X8E on the Arduino Due board used as digital signal processor with help from a WM8731 audio codec chip.

What I'm trying to accomplish

One stereo input signal filtered with a low-pass, band-pass and high-pass filter. Adjustable gain on every filter. Potentiometers to control gain. A mute button.

What I have accomplished

• Physical connection between Arduino Due board and the Wolfson WM8731 audio codec chip.
• Initital setup of the SAM3X8E processor.
• Provide a clock signal for the audio codec (from SAM3X8E).
• Configure the two wire interface (TWI) on the SAM3X8E to control the audio codec.
• Initialize the WM8731 audio codec.
• Configure the synchronous serial controller (SSC) on the SAM3X8E to send and receive audio from the audio codec as an I2S stream.
• Configure a digital input on the SAM3X8E to use a physical button as a mute button.
• Configure an analog input on the SAM3X8E to use a potentiometer to control filter gain.
• Four different infinite inpulse response (IIR) filters on each channel (LP, BP, HP and another LP on the mixed signal for noise reduction).
• This document.

What I still need to accomplish

• Work on defined filter gain control in dB.
• Three potentiometers for every filter gain.
• Measure frequency response for all filters.