Hiroaki Takagi

Title: Hiroaki Takagi: Innovator in Signal Processing Technologies

Introduction

Hiroaki Takagi is a prominent inventor based in Akishima, Japan. He has made significant contributions to the field of signal processing, holding a total of five patents. His work focuses on enhancing the efficiency and accuracy of data signal reception and correction.

Latest Patents

One of Takagi's latest patents is a receiver and synchronization correcting method. This invention includes a transformation part that converts a time domain received signal into a frequency domain signal. It also features a known signal extraction part that extracts a known signal from the frequency domain signal. Additionally, an estimation part estimates channel characteristics based on the extracted known signal. A time direction extraction part extracts channel characteristic values of a specific carrier in a time direction from the estimated channel characteristics. Furthermore, a power spectrum acquiring part acquires a power spectrum from the extracted channel characteristic values. An error calculation part calculates a carrier frequency error from the power spectrum, while a carrier correction part corrects the carrier frequency of the received signal based on this error.

Another notable patent is a data signal correction circuit, which includes a channel characteristic calculator unit that calculates a channel characteristic estimate value of a received data signal based on a pilot signal. A path detector unit determines the delay quantity of multipath propagation of the received data signal based on the calculated channel characteristic estimate value. An adaptive filter receives the delay quantity and channel characteristic estimate value as input, adjusts the input interval along the carrier frequency axis according to the delay quantity, and performs adaptive equalization on the channel characteristic estimate value.

Career Highlights

Hiroaki Takagi has worked with notable companies such as Fujitsu Corporation and Fujitsu Semiconductor Limited. His experience in these organizations has allowed him to develop and refine his innovative ideas in signal processing technologies.

Collaborations

Some of his coworkers include Masataka Umeda and Naoto Adachi. Their collaboration has contributed to the advancement of technologies in their respective fields.

Conclusion

Hiroaki Takagi's contributions to signal processing through his patents and career achievements highlight his role as an influential inventor. His work continues to impact the industry positively.