Hidehiko Sawamura

Title: Innovations of Hidehiko Sawamura

Introduction

Hidehiko Sawamura is a notable inventor based in Hachioji, Japan. He has made significant contributions to the field of digital signal processing, particularly in the areas of recording and reproduction technologies. With a total of two patents to his name, Sawamura's work has had a considerable impact on the industry.

Latest Patents

One of his latest patents is a method and apparatus for digital signal recording and/or reproduction. This invention involves forming tracks sequentially on a recording medium using a head unit mounted on a rotary cylinder. The input digital data is recorded in the recording medium, and the recorded data is then reproduced. The digital data is modulated into a code word with at least two successive bits of high- and low-level data. The timebase of the code word is compressed for efficient recording and later expanded during reproduction.

Another significant patent is a replay equalization circuit in a digital image recorder. This circuit is designed to reproduce digital image information recorded on a medium. It includes a transducer for reading the digital image information and an equalization circuit that adjusts the output based on speed information. A clock recovery circuit extracts a clock signal to ensure accurate latching of the output.

Career Highlights

Hidehiko Sawamura is currently employed at Hitachi, Ltd., a leading company in technology and innovation. His work at Hitachi has allowed him to develop and refine his inventions, contributing to advancements in digital recording technologies.

Collaborations

Throughout his career, Sawamura has collaborated with notable colleagues, including Masuo Umemoto and Yoshizumi Eto. These collaborations have fostered an environment of innovation and have led to the development of groundbreaking technologies in their field.

Conclusion

Hidehiko Sawamura's contributions to digital signal processing and recording technologies highlight his role as a significant inventor in the industry. His patents reflect a commitment to innovation and excellence in technology.