The book is a textbook on digital signal processing, written in an understandable language, equipped with a sufficient number of illustrations and illustrative examples. It contains a brief introduction to the necessary mathematical apparatus (including '-conversion, Laplace and Hilbert transformations, statistics), to the principles of machine representation of signals (binary formats), considers issues of periodic sampling. Separate chapters are devoted to discrete and fast Fourier transforms. The digital filtering section deals in detail with finite and infinite impulse response filters, filters based on frequency sampling and interpolated FIR filters. Quadrature signals and complex downconversion are described The principles of sampling frequency conversion necessary for the design of polyphase and cascaded integrator-comb filters are analyzed.