Speech recognition technique has proven to be significantly beneficial in the domain of Artificial Intelligence. This book is based on speech processing and recognition. It consists of information provided by top researchers from Italy, Tunisia, India, Netherlands, Canada and Finland. Topics like speech recognition, noise cancellation, speech enhancement and emotion recognition have been described in this book. Important techniques like voice conversion and multi resolution spectral analysis have also been elucidated. The book consists of both original research works as well as surveys along with the applications of the technology in various scientific fields. The aim of this book is to serve as a good source of knowledge for students and researchers related to this field.