dspGuru is a site dedicated to digital signal processing (DSP) designers. It has a good collection of resources for both beginners and seasoned users. Many open-source software titles can be freely downloaded, ranging from implementations of DSP algorithms to compilers and other software development tools. Five frequently asked questions lists cover some important DSP subjects, like finite and infinite impulse response filters and Fourier transforms. There is also a section called Tribal Knowledge that is filled with common techniques and tricks that experienced DSP designers know, "but isn't in the textbooks."
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