Christine A Porter

Title: Christine A Porter: Innovator in Arithmetic Coding

Introduction

Christine A Porter is a notable inventor based in San Jose, CA. She has made significant contributions to the field of coding and decoding through her innovative patent. Her work has implications in various applications, particularly in data compression and transmission.

Latest Patents

Christine holds a patent for a "Syntax based arithmetic coder and decoder." This invention involves a coder/decoder that selects one of a set of look-up tables for encoding and decoding symbols. Each look-up table contains boundary values resulting from an arithmetic coding model that partitions a first interval. A second interval contains an arithmetic code. During the encoding process, look-up table entries for a symbol value are converted to the scale of the second interval. The scaled values indicate a smaller interval containing the arithmetic code. Code bits are generated when the most significant bits of the upper and lower scaled values are equal. During decoding, a code word, which is part of an arithmetic code, is normalized from the scale of the second interval to the scale for a look-up table and then compared to entries of the look-up table. When a segment containing the code word is identified, a decoded symbol value is known. A scaling circuit converts boundary values for the segment to the scale of the second interval and then changes the second interval. Identical most significant bits in the boundary values are shifted out of a register to prevent overflow during encoding and decoding. To increase the effective size of the register, the next to most significant bit can be removed while a counter counts the number of bits removed.

Career Highlights

Christine A Porter is associated with National Semiconductor Corporation, where she has been able to apply her expertise in coding technologies. Her innovative approach has led to advancements in the efficiency of data processing and transmission.

Collaborations

Christine has worked alongside talented colleagues such as Chang Y Choo and Xiaonong Ran, contributing to a collaborative environment that fosters innovation and creativity.

Conclusion

Christine A Porter is a pioneering inventor whose work in arithmetic coding has made a significant impact in the field. Her contributions continue to influence advancements in data encoding and decoding technologies.