Silent Signals: Unlocking Communication with EchoNose," readers embark on a journey into the fascinating realm of silent speech recognition (SSR) and the groundbreaking technology known as EchoNose. Authored by leading experts in the field, this book delves deep into the innovative approach of EchoNose, which harnesses the interconnectedness of the upper respiratory tract to decipher silent speech through active acoustic sensing via the nose. Exploring the dual purpose of SSR, the book elucidates how SSR systems not only aid individuals grappling with speech disorders but also pave the way for futuristic human-computer interfaces. With the rise of wearable devices in the SSR domain, EchoNose emerges as a beacon of hope, promising enhanced performance without intrusive sensors or heavy instrumentation. Through meticulous research and user studies, the book showcases EchoNose's capability to track speech articulators and classify intricate speech activities, surpassing the limitations of conventional systems. As readers delve into the feasibility and potential applications of EchoNose, they are confronted with a compelling vision of a future where silent signals are seamlessly translated into meaningful communication, revolutionizing the way we interact with technology and each other. "Silent Signals" is a testament to the power of innovation and its transformative impact on communication and accessibility.