Company Filing History:
2 out of 135 
2 out of 42,517 
Years Active: 2002-2011
Title: Shigetaka Takagi: Innovator in Signal Processing
Introduction
Shigetaka Takagi is a notable inventor based in Tokyo, Japan. He has made significant contributions to the field of signal processing, holding a total of 4 patents. His work focuses on methods and apparatuses that enhance the efficiency and effectiveness of signal processing in various applications.
Latest Patents
One of his latest patents is a signal processing method and apparatus designed to reduce distortion. This innovation utilizes divided signals that differ only in amplitude by weighting an input signal with first weights. The method involves performing the same signal processing function on these divided signals, followed by weighting the processed signals with second weights and adding them together. The first weights are defined as k=t, k=−t, k=1, and k=−1, while the second weights are l=t and l=−t, where t=b/a, with a and b being different positive integers.
Another significant patent is a baseband filter that includes a semiconductor integrated circuit. This invention addresses the challenges faced when amplifying very small input signals that may contain large blocking signals at high frequencies. The filter is designed for mobile communication and emphasizes a large common-mode signal rejection ratio. By incorporating transconductance circuits in a cross-connection configuration, the filter not only improves the common-mode rejection ratio but also enhances the overall performance of the amplifier.
Career Highlights
Shigetaka Takagi has worked with prominent organizations such as the Semiconductor Technology Academic Research Center and Hitachi, Ltd. His experience in these institutions has allowed him to develop and refine his innovative ideas in signal processing technology.
Collaborations
Throughout his career, Takagi has collaborated with notable colleagues, including Nobuo Fujii and Satoshi Tanaka. These partnerships have contributed to the advancement of his research and the successful development of his patents.
Conclusion
Shigetaka Takagi's contributions to signal processing through his innovative patents demonstrate his expertise and commitment to advancing technology. His work continues to influence the field and inspire future innovations.