Location History:
- Urawa, JP (2002)
- Saitama, JP (2002 - 2009)
Company Filing History:
6 out of 8 
4 out of 4 
1 out of 1 Years Active: 2002-2009
Title: **Yukio Koyanagi: A Pioneer in Digital Filter Design**
Introduction
Yukio Koyanagi, an accomplished inventor based in Saitama, Japan, holds an impressive portfolio of 19 patents. His work has significantly advanced the field of digital filter design, showcasing his innovative approach to technology and engineering.
Latest Patents
Among his latest patents, Yukio has developed methods and devices related to digital filters. Notably, one of his inventions involves a unique design method where an original filter is connected to an adjustment filter in a longitudinal manner. This configuration allows for a first filter coefficient represented by a symmetric numeric string. The adjustment filter is strategically designed to maximize the original filter's frequency amplitude characteristic and employs a symmetric second filter coefficient. This combination facilitates a convolution calculation, enabling the design of a desired filter coefficient effectively.
Additionally, Yukio has introduced a breakthrough method for designing digital filters by combining unit filters with predetermined asymmetric numerical sequences as filter coefficients. This innovative approach simplifies the process of obtaining desired digital filter coefficients by merely combining unit filters. By dividing a symmetric numerical sequence at its center and utilizing one half as asymmetric filter coefficients, he has reduced the required number of taps and eliminated the need for window functions, successfully preventing discretization errors in the filter characteristics.
Career Highlights
Yukio Koyanagi's career is marked by notable contributions to the field of digital technology. His extensive patent portfolio highlights his dedication to research and innovation, particularly in developing efficient digital filtering solutions.
Collaborations
Throughout his career, Yukio has collaborated with various companies, including Neuro Solution Corporation, to further his research and bring his inventions to market. These collaborations have allowed him to apply his expertise on a broader scale and work alongside other skilled professionals in the industry.
Conclusion
In summary, Yukio Koyanagi's contributions to digital filter design are noteworthy, demonstrating his innovative spirit and technical capabilities. With 19 patents to his name, he continues to inspire fellow inventors and researchers in the realm of technological advancements. His innovative methodologies in digital filter design reflect a significant step forward in the field, ensuring his legacy as a respected inventor in Japan and beyond.