Kouichi Hirose

Title: Kouichi Hirose: Innovator in Wobble Signal Reproducing Technology

Introduction

Kouichi Hirose is a notable inventor based in Yokohama, Japan. He has made significant contributions to the field of optical data storage technology. With a total of 4 patents, his work focuses on enhancing the stability and efficiency of wobble signal reproduction in various optical disks.

Latest Patents

One of his latest patents is a wobble signal reproducing circuit designed to stably reproduce wobble signals from all disks of CD-R/RW, DVD-R/RW, and DVD-RAM. This invention incorporates an Automatic Gain Control (AGC) circuit that equates the output of a push-pull circuit across a wide range. It also includes a second AGC circuit that ensures uniform wobble amplitude. The circuit is capable of holding a gain or changing the response time constant during the reproduction of DVD-R/RW disks. Additionally, it detects the land pre-pit region using the push-pull output to maintain AGC or adjust the response time constant. In the case of DVD-RAM, the AGC is held or the response time constant is modified during the reproduction process.

Career Highlights

Kouichi Hirose is currently employed at Hitachi, Ltd., where he continues to innovate in the field of optical technologies. His work has been instrumental in improving the reliability and performance of optical data storage systems.

Collaborations

He has collaborated with notable colleagues such as Kouichirou Nishimura and Manabu Katsuki, contributing to advancements in their shared field of expertise.

Conclusion

Kouichi Hirose's contributions to wobble signal reproduction technology have significantly impacted the optical data storage industry. His innovative patents and collaborative efforts continue to drive advancements in this essential technology.