SDR – basic structure

The basic structure of the system will be:

 audio in  →  anti-aliasing filter  →  ADC  →  digital signal processing  →  output

For the filtering experiments the output will be an analog audio signal (from a DAC); while for the QRSS experiments the output will be a stream of values for plotting in Matlab on a laptop.

The Arduino Due has all that is required for these experiments (ADCs, DACs and a USB serial port).

I will start by writing a simple program to digitise the filtered audio input and pass it directly to the DAC to give an audio signal again.

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