Mark A Johnson

Title: **Mark A Johnson: Innovator in Speech Coding Technology**

Introduction

Mark A Johnson, a notable inventor based in Cambridge, MA, is recognized for his contributions to the field of speech processing. With an impressive portfolio of four patents, Johnson has made significant advancements, particularly in speech coding and decoding systems. His work stands out for its technical sophistication and practical applications, particularly within telecommunications.

Latest Patents

Among Johnson’s latest inventions is a **Speech Coding and Decoding System**, which employs a known code-excited linear prediction (CELP) coding method. This innovative system operates by selecting an optimum pitch prediction residual vector from an adaptive codebook along with a corresponding first gain. At the same time, it chooses an optimal code vector from a white-noise stochastic codebook and its corresponding second gain. Unique to this invention is the implementation of a weighted orthogonalization transforming unit which allows the transformation of the code vector into a perceptually weighted reproduced code vector. This advancement sets it apart from previous designs by ensuring orthogonality to the optimal perceptually weighted pitch prediction vector.

Additionally, Johnson has developed a **Speech Coding System Having Codebook Storing Differential Vectors**, further enhancing techniques for efficient speech processing.

Career Highlights

Currently, Mark A Johnson is affiliated with Fujitsu Corporation, where he continues to innovate and expand upon his research in the realm of speech technologies. His career reflects a deep commitment to pushing the boundaries of knowledge in his field.

Collaborations

Throughout his career, Johnson has collaborated with esteemed colleagues like Tomohiko Taniguchi and Hideaki Kurihara. These partnerships have fostered an environment of creativity and technical exchange, resulting in landmark advancements in speech coding technologies.

Conclusion

In summary, Mark A Johnson's impressive achievements in speech coding innovation highlight his role as a key contributor in the field. His patents not only reflect his technical expertise but also his commitment to enhancing communication technologies. As he continues his journey with Fujitsu Corporation, the impact of his work will likely resonate throughout the industry for years to come.