Masaharu Tanai

Title: Masaharu Tanai: Innovator in Frequency Measurement Technologies

Introduction

Masaharu Tanai is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of frequency measurement technologies. With a total of 3 patents to his name, Tanai's work has had a notable impact on digital mobile communication systems.

Latest Patents

Tanai's latest patents include a frequency error measuring method and a frequency error measuring device. The frequency error measuring method involves a frequency spectrum analyzer that receives a modulation signal and measures the frequency (F). A synchronous detection frequency (B) is determined based on this frequency (F). An adder calculates the difference (G) between the synchronous detection frequency (B) and a reference frequency (C). A frequency error detector then obtains a frequency error (E) using the phase trajectory method. The final frequency error is derived by adding the difference (G) and the frequency error (E).

The frequency deviation measuring device is utilized in digital mobile communication systems to measure frequency deviations concerning π/4 QPSK modulation signals. It detects a center frequency based on the spectrum distribution of a testing signal. A non-modulation signal is generated based on this detected center frequency. Quasi-synchronization wave detection is performed on both the testing signal and the non-modulation signal to produce an IQ base band signal. The device detects the first frequency deviation based on this IQ base band signal and the second frequency deviation based on the difference between the center frequency and a testing frequency set value. The combination of these deviations provides a comprehensive measurement of frequency deviation.

Career Highlights

Masaharu Tanai is currently associated with Ando Electric Company, where he continues to innovate and develop advanced technologies in frequency measurement. His expertise and dedication to his field have established him as a respected figure in the industry.

Collaborations

Tanai collaborates with Masayasu Sugimori, working together to advance their research and development efforts in frequency measurement technologies.

Conclusion

Masaharu Tanai's contributions to frequency measurement technologies have significantly influenced the field of digital communication. His innovative patents and ongoing work at Ando Electric Company highlight his commitment to advancing technology.