Toshiyuki Iseki

Title: Toshiyuki Iseki: Disk-Recording Signal Processing Innovations

Introduction

Toshiyuki Iseki is an inventor associated with Yokohama, Japan, and Hitachi, Ltd. His patent work includes integrated signal-processing technology for disk recording and playback. The supplied information lists 4 patents.

Latest Patents

Two of Iseki’s listed patents are “Disk Recording Apparatus with Adaptive Window Adjusting” and “Data Separator and Signal Processing Circuit with an Adjustable Window.” Both describe a disk-apparatus signal-processing unit that combines a data separator, code decoder, code encoder, and write-compensation circuit on a single integrated circuit.

The data separator extracts a synchronization clock from code data read from a disk. The decoder uses the clock and synchronized code data to produce decoded output, while the encoder converts data from a host computer or disk controller into code data. The write-compensation circuit addresses peak shifts in data being written. The described integrated circuit uses a Bipolar-CMOS process that combines bipolar and CMOS transistors.

Career Highlights

Iseki’s listed inventions focus on integrating key disk-recording and playback functions into a single chip. This approach brings clock separation, decoding, encoding, and write compensation together within one signal-processing circuit.

Collaborations

The supplied information identifies Satoshi Kawamura and Ryutaro Horita as Iseki’s coworkers. It does not specify their roles in the listed patents.

Conclusion

Toshiyuki Iseki’s listed patent work at Hitachi, Ltd. centers on integrated circuits for disk signal processing, including adjustable-window data separation and write compensation.