DSP Basics is FREE (previously available on our bores.com website since 1998 but now on our online training site) allows access as a guest. It introduces some basics of Digital Signal Processing including:
The book takes a practical approach and does not assume a lot of prior knowledge.
This book has been incredibly popular for many years, and remains an excellent first step. To become a real practitioner in DSP you really should follow one of our more recent DSP online books
These deal in more depth both with practical engineering questions and with some of the more difficult concepts and ideas of DSP that are often misunderstood.Go to DSP Basics