Location History:
- Chicago, IL (US) (1985)
- Park Ridge, IL (US) (1986 - 1990)
Company Filing History:
5 out of 3,345 
2 out of 745 
2 out of 386 
Years Active: 1985-1990
Title: **Dimitrios P Prezas: Innovator in Digital Speech Processing**
Introduction
Dimitrios P Prezas is an accomplished inventor based in Park Ridge, IL, known for his significant contributions to the field of digital speech processing. With a total of seven patents to his name, Prezas has advanced the way speech is analyzed and synthesized, demonstrating a keen understanding of both theoretical and practical aspects of speech technology.
Latest Patents
Among his notable inventions, two of Dimitrios' latest patents include a digital speech coder with different excitation types and voice synthesis utilizing multi-level filter excitation. The first patent presents a system where pitch information is transmitted during voiced segments of speech, and modified residual information during unvoiced segments. This sophisticated method utilizes a pitch detection circuit for accurate analysis and synthesis. The latter patent focuses on smart decision-making during the transmission of excitation types based on the characteristics of the speech signal. By comparing the variance of the residual against the mean amplitude, the system effectively utilizes pulse or noise excitation to enhance speech quality.
Career Highlights
Throughout his career, Dimitrios Prezas has worked at prestigious organizations such as AT&T Bell Laboratories and American Telephone & Telegraph Company. His time at AT&T Bell Laboratories provided him with a platform to explore groundbreaking innovations, leading to his current standing as a reputable figure in the field of telecommunications and speech processing.
Collaborations
Dimitrios has collaborated with esteemed colleagues including Walter T Hartwell and Joseph Picone. Their combined efforts in research and development have contributed significantly to advances in voice technology, showcasing the value of teamwork in the innovation process.
Conclusion
Dimitrios P Prezas stands out as a visionary inventor in digital speech processing. His numerous patents reflect a deep commitment to enhancing communication technologies. Through his career and collaborations, he has made lasting contributions that continue to influence the field of speech analysis and synthesis.