Digital Voice Modes

Digital Voice Modes explores the powerful convergence of digital signal processing (DSP) and artificial intelligence in real-time voice communications. The journey begins with the foundational contributions of Euler, Fourier, and Shannon, whose mathematical insights laid the groundwork for modern communications. From there, we trace the evolution of speech and signal processing technologies through pulse-code modulation (PCM), linear predictive coding (LPC), multi-band excitation (MBE), and neural-network-based speech coding. While many of today's amateur radio digital voice transceivers rely on proprietary codecs, this book places its emphasis on open-source technologies that encourage experimentation, innovation, and a deeper understanding of how digital voice systems operate. This book serves as the companion text for a five-week course on Digital Voice Modes, providing both theoretical foundations and practical insights into the technologies shaping the future of amateur radio communications. Additional information is available at www.va2gj.com.