Bøger af Aritra Acharyya

This book presents recent and upcoming technological advancements in millimeter-wave (mm-wave), infrared (IR) and terahertz (THz) frequency spectrums. The scope of this book includes a significantly long portion of the electromagnetic spectrum, starting from the mm-waves (i.e. 30 GHz) and extended up to the end of the near-IR spectrum (i.e. 450 THz). Most significant aspect of this portion of the electromagnetic spectrum is that it includes a frequency regime where the gradual technological transition from electronics to photonics occurred. The book especially focuses on the recent advancements and several research issues related to materials, sources, detectors, passive circuits, advanced signal processing and image processing algorithms for mm-wave, IR and THz frequency bands. The book covers a very wide range of readers from basic science to technological experts as well as research scholars.

This book is presenting a fresh look into the field of automatic speaker verification technique via artificial neural networks. It is intended as a text for postgraduate students in applied physics, electrical and electronics engineering. It can exclusively serve as a reference for the scientists who are working in the area of automatic speaker verification/identification techniques. Traditional password or token based authentication schemes are insecure and are being replaced by biometric authentication mechanisms. Voiceprints were one of the first biometrics to be widely used. And artificial neural network is one of the most efficient, speedy and reliable tool by which an automatic speaker verification (ASV) system can be developed. The primary aim of this book is to describe an ASV system using artificial neural network which can be used in security purpose, criminal identification, etc. The primary intends are to increase the speed of the system maintaining optimum accuracy and improve its noise performance.