Location History:
- Yokohama, JA (1976 - 1978)
- Yokohama, JP (1980 - 1990)
- Totsuka-ku, Yokohama-shi, Kanagawa-ken, JP (1993)
Company Filing History:
10 out of 42,485 
1 out of 832,680 Years Active: 1976-1993
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.
Inventor’s Patent Attorneys refers to legal professionals with specialized expertise in representing inventors throughout the patent process. These attorneys assist inventors in navigating the complexities of patent law, including filing patent applications, conducting patent searches, and protecting intellectual property rights. They play a crucial role in helping inventors secure patents for their innovative creations.