Company Filing History:
4 out of 745 
1 out of 3,345 
1 out of 2,714 
Years Active: 1979-1990
Title: Walter T. Hartwell: Innovator in Speech Recognition Technology
Introduction
Walter T. Hartwell is a notable inventor based in St. Charles, IL (US), recognized for his contributions to speech recognition technology. With a total of 7 patents, Hartwell has made significant advancements in the field, particularly in systems that enhance human-computer interaction through voice.
Latest Patents
One of Hartwell's latest patents is for an automatic speech recognition system that utilizes echo cancellation. This innovative customer inquiry unit allows for the recognition of human speech even when an initial prerecorded message is transmitted via a telephone network. The system is designed to respond to inquiries received through the telephone network, effectively managing the challenges posed by echo, which can occur when speech energy is reflected back to the inquiry system. The echo canceler adapts to the network conditions, ensuring that only the customer's speech response is processed.
Another significant patent involves a digital speech coder that employs different excitation types. This system analyzes and synthesizes speech by transmitting pitch information during voiced segments and modified residual information during unvoiced segments. The pitch detection circuit plays a crucial role in determining the nature of the speech, while a multi-pulse excitation forming circuit generates the necessary signals for effective speech synthesis.
Career Highlights
Throughout his career, Walter T. Hartwell has worked with prestigious organizations such as American Telephone & Telegraph Company and AT&T Bell Laboratories. His experience in these companies has allowed him to develop and refine his innovative ideas in speech technology.
Collaborations
Hartwell has collaborated with notable individuals in the field, including Edward C. Bronson and Willem Bastiaan Kleijn. These collaborations have contributed to the advancement of his research and the successful development of his patented technologies.
Conclusion
Walter T. Hartwell's contributions to speech recognition technology have paved the way for more effective communication systems. His innovative patents and career achievements highlight his role as a significant figure in the field of speech technology.