Nobuhisa Yoshida

Title: Nobuhisa Yoshida: Innovator in Signal Processing and Optical Recording Technologies

Introduction

Nobuhisa Yoshida is a prominent inventor based in Kamakura, Japan. He has made significant contributions to the fields of signal processing and optical recording technologies. With a total of 11 patents to his name, Yoshida's work has had a lasting impact on the industry.

Latest Patents

Yoshida's latest patents include a signal processing system and an information storage medium. According to one embodiment, a first encoder encodes main information, while a second encoder encodes sub-information. A first modulator modulates a carrier based on the output of the first encoder. A duplicating module duplicates the output of the second encoder to generate encoded sub-information units. The second modulator amplitude-modulates the output of the first modulator based on the encoded sub-information units. The second modulator amplitude-modulates with σ/(μ×(2)) being 0.4 or less, wherein a noise power of a transmission path or a storage medium is σ. The number of the encoded sub-information units is N, and the signal levels after amplitude modulation, which correspond to bit and bit of the encoded sub-information units, are A and B, with a level difference A−B being μ. Another notable patent involves phase-change optical recording media and an optical recording-reproducing apparatus. This invention relates to optical recording media that include two or more information layers, with at least one of the information layers containing a writable recording film. In this optical recording media, at least one information layer has protrusions and recesses that permit tracking, while at least another information layer is substantially flat.

Career Highlights

Throughout his career, Yoshida has worked with notable companies such as Kabushiki Kaisha Toshiba and Memory-Tech Corporation. His experience in these organizations has allowed him to develop and refine his innovative ideas.

Collaborations

Yoshida has collaborated with esteemed colleagues, including Naomasa Nakamura and Hideki Ohkawa. These partnerships have contributed to the advancement of his research and inventions.

Conclusion

Nobuhisa Yoshida is a distinguished inventor whose work in signal processing and optical recording technologies has garnered him recognition in the field. His innovative patents and collaborations reflect his commitment to advancing technology.