Bücher von Don Davis

This book addresses the problem of articulatory speech synthesis based on computed vocal tract geometries and the basic physics of sound production in it. Unlike conventional methods based on analysis/synthesis using the well-known source filter model, which assumes the independence of the excitation and filter, we treat the entire vocal apparatus as one mechanical system that produces sound by means of fluid dynamics. The vocal apparatus is represented as a three-dimensional time-varying mechanism and the sound propagation inside it is due to the non-planar propagation of acoustic waves through a viscous, compressible fluid described by the Navier-Stokes equations. We propose a combined minimum energy and minimum jerk criterion to compute the dynamics of the vocal tract during articulation. Theoretical error bounds and experimental results show that this method obtains a close match to the phonetic target positions while avoiding abrupt changes in the articulatory trajectory. The vocal folds are set into aerodynamic oscillation by the flow of air from the lungs. The modulated air stream then excites the moving vocal tract. This method shows strong evidence for source-filter interaction. Based on our results, we propose that the articulatory speech production model has the potential to synthesize speech and provide a compact parameterization of the speech signal that can be useful in a wide variety of speech signal processing problems. Table of Contents: Introduction / Literature Review / Estimation of Dynamic Articulatory Parameters / Construction of Articulatory Model Based on MRI Data / Vocal Fold Excitation Models / Experimental Results of Articulatory Synthesis / Conclusion

RALPH'S JOURNEY, a fascinating and riveting adventure novel that offers social commentary and political opinions while dispensing philosophical advice, is written in the tradition of "Oklahoma Tough" by Ron Padgett and "The Outsiders" by S.E. Hinton. It chronicles the life of Angel Raphael Johnson (AKA Ralph Johnson) from the time he is born in remote, rural Oklahoma through his young adulthood as he becomes associated with organized crime figures in Tulsa. It follows him as he leaves town one step ahead of the police and travels to California and Oregon. This is a forceful and enchanting book about a rebellious young man with violent tendencies and his exploits on the outskirts of the law. Characters include bootleggers, mafia figures, police investigators, and adult mentors. In the end, it is a story about how redemption is possible if a young person can accept mentoring and make the right choices in life. This gripping story is an absolute must read for all fans of a tale well told.