Collection of online books, relevant to readers interested in digital signal processing (DSP):

“Szabad(ka)” is a hexapod robot constructed by current and former students of the Polytechnical Engineering College “VTS” Subotica (Serbia) and the College of Dunaújváros (Hungary). This robot is designed to test and implement algorithms, designed by the Hungarian science institute KFKI:

DSP as a "brain" in robots: