"This brief is intended to provide a solid understanding of the noise reduction problem, with a focus on speech processing, in order to design a well-targeted solution for a well-defined application. ... References are provided at the end of each chapter and point the reader to contemporary research as well as foundational studies in each area. ... Excellent formulae, charts and graphs are provided throughout the text, with many in full color." (Chuck H. Perala, Noise Control Engineering Journal, Vol. 64 (5), September-October, 2016)