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For the Inventor, By the Inventor

Ehime, Japan

Shoji Marukawa

This inventor holds 6 USPTO granted patents. Top assignee: Matsushita Electric Industrial Co., Ltd.. Active years: 2001-2005.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Shoji Marukawa. Retrieved from https://idiyas.com/inventor/shoji-marukawa

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 6

% Patents Active = 50.0

Average Co-Inventor Count = 1.7

ph-index = 4

Forward Citations = 82(Granted Patents)


Location History:

  • Saijo, JP (2004)
  • Ehime, JP (2001 - 2005)

Company Filing History:

goldMedal6 out of 27,375 
 
Matsushita Electric Industrial Co., Ltd.
 patents

Years Active: 2001-2005

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6 patents (USPTO):Explore Patents
1. 6934099 - Digital data reproducing apparatus (2005-08-23),
2. 6836511 - Apparatus for processing a reproduced digital signal (2004-12-28),
3. 6834035 - Digital reproduced signal processing device (2004-12-21),
4. 6741533 - Tracking error detection device (2004-05-25),
5. 6687841 - Wide frequency range PLL clock generating circuit with delta sigma modulating circuitry for reducing the time changing ratio of the input voltage of a voltage controlled oscillator (2004-02-03),
6. 6291962 - Offset control circuit and offset control method (2001-09-18),

Title: The Innovations of Shoji Marukawa

Introduction

Shoji Marukawa is a notable inventor based in Ehime, Japan. He has made significant contributions to the field of digital data reproduction, holding a total of 6 patents. His work has advanced the technology used in digital recording and playback systems.

Latest Patents

One of Marukawa's latest inventions is a digital data reproducing apparatus. This apparatus includes a read head for reading data from a recording medium, an analog-to-digital converter for converting the data into digital format, and a memory for storing the converted digital data. Additionally, it features a phase control circuit for managing the phase of the digital data and an off-track detector for identifying when the read head deviates from its intended track on the recording medium. The storing operation to the memory is controlled based on signals from both the off-track detector and the phase control circuit.

Another significant patent is for a digital signal processing apparatus. This apparatus is designed for reading signals from a high-frequency cutoff type digital recording medium. It includes a read head, a low-pass filter to eliminate high-frequency noise, and an analog/digital converter to transform the filtered analog signal into a digital format. Furthermore, it incorporates an FIR filter for equalizing the frequency response of the digital signal, an adaptive equalization coefficient setting device, and a Viterbi decoder for decoding the processed data.

Career Highlights

Shoji Marukawa has been associated with Matsushita Electric Industrial Co., Ltd., where he has contributed to various innovative projects. His expertise in digital data processing has positioned him as a key figure in the development of advanced recording technologies.

Collaborations

Marukawa has worked alongside talented colleagues such as Toshinori Okamoto and Yoshimasa Oda. Their collaborative efforts have led to the successful development of several groundbreaking technologies in the field of digital data reproduction.

Conclusion

Shoji Marukawa's contributions to digital data reproduction technology have been invaluable. His innovative patents and collaborative work continue to influence advancements in the industry.

Profile summary based on public USPTO records.
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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