Thierry Liethoudt

Title: Innovations of Thierry Liethoudt in Speech Coding

Introduction

Thierry Liethoudt is an accomplished inventor based in Nice, France. He has made significant contributions to the field of speech coding, particularly through his innovative patent. His work focuses on enhancing the efficiency and accuracy of predictive speech coders.

Latest Patents

Thierry Liethoudt holds a patent titled "Pitch detection for use in a predictive speech coder." This invention involves a pitch detector designed to adjust long-term prediction in a pulse excitation speech coder. The process begins with deriving a residual signal r(n) from the speech signal s(n) through short-term filtering. Following this, r(n) is processed to calculate a prediction error signal e(n), which is then pulse excitation encoded. The processing of e(n) includes predicting a residual by measuring a pitch-related factor M, which is achieved in two steps. The first step involves calculating a coarse M value through peak clipping and sign transition detection. The second step adjusts the M value by performing autocorrelation calculations on the roughly spaced peaks.

Career Highlights

Thierry Liethoudt is associated with the International Business Machines Corporation, commonly known as IBM. His work at IBM has allowed him to explore and develop advanced technologies in speech processing and coding.

Collaborations

Throughout his career, Thierry has collaborated with notable colleagues, including Hubert Crepy and Philippe Elie. These collaborations have contributed to the advancement of his research and innovations in the field.

Conclusion

Thierry Liethoudt's contributions to speech coding through his innovative patent demonstrate his expertise and commitment to advancing technology. His work continues to influence the field and showcases the importance of innovation in communication technologies.