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For the Inventor, By the Inventor

Yokohama, Japan

Yasufumi Yumde

This inventor holds 11 USPTO granted patents. Top assignees: Hitachi, Ltd., Other. Active years: 1976-1993.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Yasufumi Yumde. Retrieved from https://idiyas.com/inventor/yasufumi-yumde

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

USPTO Granted Patents = 11

% Patents Active = 100.0

Average Co-Inventor Count = 3.1

ph-index = 7

Forward Citations = 156(Granted Patents)


Location History:

  • Yokohama, JA (1976 - 1978)
  • Yokohama, JP (1980 - 1990)
  • Totsuka-ku, Yokohama-shi, Kanagawa-ken, JP (1993)

Company Filing History:

goldMedal10 out of 42,740 
 
Hitachi, Ltd.
 patents
silverMedal1 out of 834,570 
Other
 patents

Years Active: 1976-1993

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11 patents (USPTO):Explore Patents
1. 5189564 - Magnetic recording/reproducing method and apparatus (1993-02-23),
2. 4937686 - Method and apparatus for PCM recording and reproducing an audio signal (1990-06-26),
3. 4843493 - Rotary head type magnetic recording and reproducing apparatus and method (1989-06-27),
4. 4743977 - VTR having magnetic-head array capable of recording/reproducing signals (1988-05-10),
5. 4670796 - Rotary head type PCM recorder (1987-06-02),
6. 4292652 - Method of receiving a video signal (1981-09-29),
7. 4210927 - Method for transmitting a color video signal on a narrow-band (1980-07-01),
8. 4081834 - System for compensating jitter of video signal (1978-03-28),
9. 4004082 - Method and system for multiplexing signal for transmission (1977-01-18),
10. 3947870 - Receiving system for auxiliary information signal transmitted during the (1976-03-30),
11. 3941921 - System for converting frequency band of picture signal (1976-03-02),

Title: Yasufumi Yumde: Innovator in Magnetic Recording Technologies

Introduction

Yasufumi Yumde is a prominent inventor based in Yokohama, Japan. He holds a total of 11 patents that showcase his contributions to the field of digital audio and video recording technologies. His innovative approaches have significantly advanced the methods of recording and reproducing audio signals.

Latest Patents

Yumde's latest patents include a magnetic recording/reproducing method and apparatus. This invention focuses on an information recording/reproducing apparatus for recording and reproducing a digital audio signal on a magnetic medium. It utilizes a modulator/demodulator for modulating and demodulating the digital signal by offset quadrature phase shift keying (O-QPSK). This technique is particularly beneficial for multi-layer recording of video and audio signals in a video tape recording/reproducing system, as it effectively avoids interference between the recorded digital audio and video signals during reproduction.

Another significant patent is the method and apparatus for PCM recording and reproducing an audio signal. This apparatus samples an audio signal with a sampling frequency that has an asynchronous relation to the field frequency of a video signal. It converts the audio signal to a PCM signal, adds error detection and correction data, and forms a data frame for recording. The system is designed to ensure synchronization with the video signal, enhancing the quality of the recorded audio.

Career Highlights

Yasufumi Yumde has worked with notable companies, including Hitachi, Ltd. His experience in these organizations has allowed him to refine his skills and contribute to groundbreaking technologies in the field of audio and video recording.

Collaborations

Yumde has collaborated with esteemed colleagues such as Takashi Furuhata and Takao Arai. Their joint efforts have further propelled advancements in the technologies they have worked on.

Conclusion

Yasufumi Yumde's innovative work in magnetic recording technologies has made a significant impact on the industry. His patents reflect a deep understanding of digital audio and video systems, showcasing his role as a key inventor in this field.

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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