This book presents a comprehensive exploration of audiometry, integrating principles from biomedical engineering, auditory physiology, and clinical practice. It examines the design and functionality of audiometric devices, including digital and portable systems, and analyzes their applications across diverse patient populations. Core topics include hearing loss types, auditory signal processing, and diagnostic methodologies such as pure-tone and speech audiometry. Emphasizing international standards and emerging technologies, the book serves as a vital resource for researchers, clinicians, and students aiming to bridge theoretical knowledge with practical solutions in auditory diagnostics and hearing care innovation.