I’m currently building a couple of digital crossovers for my Pluto speakers based on the Beaglebone. I have a Beaglebone controlling a cs4271 codec on a breadboard via alsa and jackd, and I have my software mostly written. My intent is to run the system at kHz, but that may turn out to be more than the Beaglebone can handle. Currently my -to- kHz upsampling code and two channels of digital filter code are using up about 80% of the available cycles, but I’m not done optimizing. I really need to leave a fair amount of headroom on the CPU, maybe 40%, to be sure of not ever missing a sample. Unfortunately the available Linux kernels for Beaglebone do not yet include a real-time version. I’m also in the process of learning how to make PCBs using the gEDA free software package.
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