Sang-hyun Chi

Title: Sang-hyun Chi: Innovator in Speech Coding and Vector Quantization

Introduction

Sang-hyun Chi is a notable inventor based in Gangwon-do, South Korea. He has made significant contributions to the fields of speech coding and vector quantization. With a total of 2 patents, his work has advanced the technology used in audio processing.

Latest Patents

Chi's latest patents include a "Bitrate Scalable Speech Coding and Decoding Apparatus and Method." This invention features a coding apparatus that consists of a base layer, a speech quality enhancement layer, and a multiplexer. The base layer filters an input speech signal using linear prediction coding and generates an excitation signal corresponding to the filtered speech signal through a fixed codebook search and an adaptive codebook search. The speech quality enhancement layer enhances the speech quality by searching a fixed codebook using parameters obtained from the base layer. The multiplexer then combines the signals generated by both layers.

Another significant patent is the "Fast Search Method for Nearest Neighbor Vector Quantization." This method provides a fast search technique for finding the optimum codeword for nearest neighbor vector quantization. It calculates an upper and lower boundary value for the optimum codeword based on the distortion of a designated element in an input vector. A binary search method is employed to determine the start and end points for the codebook search, allowing for a more efficient search within a calculated range.

Career Highlights

Sang-hyun Chi is currently employed at Samsung Electronics Co., Ltd., where he continues to innovate in the field of audio technology. His work has been instrumental in developing advanced coding and decoding methods that enhance speech quality and processing efficiency.

Collaborations

Chi has collaborated with notable colleagues, including Nam-il Lee and Yong-Serk Kim. Their combined expertise has contributed to the successful development of innovative technologies in their respective fields.

Conclusion

Sang-hyun Chi's contributions to speech coding and vector quantization demonstrate his commitment to advancing technology in audio processing. His patents reflect a deep understanding of the complexities involved in these fields, making him a valuable asset to Samsung Electronics and the broader technological community.