Tadahiko Kameyama

Title: Tadahiko Kameyama: Inventor in Magnetic Recording Technology.

Introduction

Tadahiko Kameyama is an inventor associated with Odawara, Japan, and Hitachi, Ltd. His work includes inventions for magnetic recording and information storage. He holds 3 patents.

Latest Patents

Kameyama’s patent, “Information Storage Device Having Transducers Operating in a Pulse Mode in Synchronism with a Timing Clock,” describes applying sense current to a transducer in synchronized pulses. This approach reduces the time-averaged sense current. An MR head reproduces information from a magnetic disk as signal pulses synchronized with the timing clock. The pulses are sample-held, converted into digital form, and processed by a partial-response demodulator to retrieve recorded data.

His patent, “Data Coding System in a Magnetic Recording Apparatus,” describes converting each input bit into a two-bit signal. The coding scheme places between two and seven zeros between adjacent ones. It also specifies a 1:2 ratio between the minimum and maximum densities at which ones appear in the resulting code.

Career Highlights

Kameyama’s listed inventions address signal processing and data coding in magnetic recording systems. Together, they reflect technical contributions to the reliable storage and retrieval of recorded information.

Collaborations

Kameyama is associated with Hitachi, Ltd. His listed coworkers include Noriaki Hatanaka and Takeshi Maeda.

Conclusion

Tadahiko Kameyama’s patents focus on pulse-synchronized information retrieval and coding methods for magnetic recording, highlighting his contributions to storage technology.