Sigeyuki Unagami

Title: Sigeyuki Unagami: Innovator in Speech Signal Processing

Introduction

Sigeyuki Unagami is a notable inventor based in Atsugi, Japan. He has made significant contributions to the field of speech signal processing. His innovative work has led to the development of a patented technology that enhances the efficiency of encoding and decoding speech signals.

Latest Patents

Unagami holds a patent for a vector quantization encoder and vector quantization decoder. This apparatus is designed for compressing and decompressing speech signals. The encoder or decoder consists of multiple codebooks, each controlling a set of indexed code vectors for different frequency bands. Each codebook is equipped with a synthesis filter that reproduces a signal wave shape based on the corresponding code vector. Additionally, the encoder or decoder includes an adder that computes the sum of signal wave shapes produced by the synthesis filters. This innovative arrangement significantly reduces the memory size required for each codebook used in the encoding or decoding process, as well as the operational load during these processes. Unagami's patent is a testament to his expertise and creativity in the field.

Career Highlights

Sigeyuki Unagami is associated with Fujitsu Corporation, where he has been able to apply his skills and knowledge in a practical setting. His work at Fujitsu has allowed him to contribute to advancements in technology that impact various industries.

Collaborations

Unagami has collaborated with notable colleagues such as Yoshinori Tanaka and Tomohiko Taniguchi. These collaborations have fostered an environment of innovation and have led to further advancements in their respective fields.

Conclusion

Sigeyuki Unagami is a distinguished inventor whose work in speech signal processing has made a significant impact. His patented technology demonstrates his commitment to innovation and excellence in engineering.