Hisashi Terada

Title: Hisashi Terada: Innovator in Spread Spectrum Communication

Introduction

Hisashi Terada is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of communication technology, particularly in spread spectrum systems. With a total of 3 patents to his name, Terada's work has had a notable impact on the industry.

Latest Patents

One of Hisashi Terada's latest patents is the "Spread PN code signal receiver." This invention features a delay locked loop (DLL) circuit in an intermediate frequency (IF) or radio frequency (RF) stage. It is characterized by correlation outputs used for DLL circuit control, which include a correlation output between a PN code advanced in phase with respect to the received signal and the received signal itself. Additionally, it includes a correlation output between a PN code delayed in phase and the received signal. These correlation outputs are crucial for detecting the lock/unlock signal in the DLL circuit. The invention employs AND logic for these two correlation outputs to generate the lock/unlock signal only when the DLL circuit is perfectly synchronized with the received signal. This ensures that a lock state cannot be detected until a stable lock state is achieved.

Another significant patent is the "Spread spectrum communication system." This invention detects the correlation between a PN code pattern of the synchronization preamble data of an incoming spread spectrum signal and a reference PN code pattern generated on the reception side using a surface acoustic wave (SAW) convolver. The gate length of the SAW convolver is shorter than the preamble data length. However, the apparatus is designed to obtain the true correlation output by calculating the logical multiplication of the correlation output from the SAW convolver and the validation pulse.

Career Highlights

Hisashi Terada is currently employed at Kabushikikaisha Kenwood, a well-known company in the electronics and communication sector. His work at Kenwood has allowed him to further develop his innovative ideas and contribute to advancements in communication technology.

Collaborations

Throughout his career, Terada has collaborated with notable colleagues, including Shintaro Watanabe and Yasushi Yamaguchi. These collaborations have fostered a creative environment that has led to the development of groundbreaking technologies.

Conclusion

Hisashi Terada's contributions to the field of communication technology, particularly through his patents, highlight his innovative spirit and dedication