The book "Harmonical analysis of nonlinear devices and signal transmission paths in infocommunications" under the authorship of B. and . Kirillova is a unique teaching aid that will become an indispensable assistant for students, graduate students and specialists in the field of infocommunications and electrical engineering .. This publication not only dives deep into the theoretical aspects of harmonic analysis, but also offers practical recommendations that will help readers better understand the complex processes taking place in modern communication systems. The book focuses on nonlinear devices and their role in signal transmission. The author masterfully explains how harmonic analysis can be used to evaluate and optimize the operation of these devices. Readers will be able to learn about the different methods of analysis that are used to study nonlinear systems, as well as how these methods can be adapted to solve real-world problems in the field of infocommunications. In. and . Kirillov shares his knowledge and experience, which makes the material accessible and understandable even for those who are just starting their way in this area. This book will be of particular interest to technical students, graduate students and young professionals seeking to deepen their knowledge in the field of signal transmission and working with non-linear devices. It can also attract the attention of teachers and researchers working in related fields, such as radio engineering, electronics, and telecommunications. If you are looking for materials that will help you prepare for exams or deepen your knowledge, this guide will be an excellent choice. The topics raised in the book cover a wide range of issues related to harmonic analysis, including signal theory, methods of their processing and the transfer of information through various channels. The author emphasizes the importance of understanding nonlinear effects that can significantly affect the quality of signal transmission. This makes the book particularly relevant in light of the rapid development of technology and the emergence of new communication standards such as 5G and IoT. Style B. and . Kirillov is distinguished by clarity and logical presentation, which allows readers to easily assimilate even the most complex concepts. His experience in the field of infocommunications and deep knowledge in signal theory make this book not only a textbook, but also a real guide to the world of modern technologies. In. and . Kirillov is also known for his other works, which cover various aspects of electrical engineering and telecommunications, and his name has become synonymous with a qualitative and relevant scientific approach. If you are looking for a tutorial that will help you understand the complex issues of harmonic analysis and signal transmission, “Harmonious analysis of non-linear devices and signal transmission paths in infocommunications” will become your reliable companion. This book will not only give you theoretical knowledge, but also equip you with the practical tools you need for a successful career in infocommunications. Do not miss the opportunity to expand your horizons and deepen your knowledge with this unique edition!