Shigeichi Hirasawa

Title: Shigeichi Hirasawa: Innovator in Digital FSK Demodulation

Introduction

Shigeichi Hirasawa is a notable inventor based in Kobe, Japan. He has made significant contributions to the field of digital signal processing, particularly with his innovative work on frequency shift keying (FSK) demodulation. His expertise and inventions have had a lasting impact on communication technologies.

Latest Patents

Hirasawa holds a patent for a Digital FSK Demodulator. This invention includes a digital phase-locked loop (PLL) that converts an FSK modulated input signal with two different frequencies into rectangular waveforms. The design features two reversible N-bit counters that count clock pulses to determine instantaneous duty factors in the form of N parallel bits for each pulse repetition period. Additionally, a read-only memory multiplies alternate outputs from the counters by a ratio of the lower to the higher frequency of the input signal. A digital first-order low-pass filter then removes high-frequency components, resulting in a demodulated binary signal.

Career Highlights

Hirasawa has worked at Mitsubishi Electric Corporation, where he has been able to apply his skills and knowledge in a collaborative environment. His work has contributed to advancements in digital communication systems, enhancing the efficiency and reliability of data transmission.

Collaborations

One of his notable collaborators is Akira Horiguchi. Together, they have worked on various projects that leverage their combined expertise in digital signal processing.

Conclusion

Shigeichi Hirasawa's contributions to the field of digital FSK demodulation exemplify his innovative spirit and technical prowess. His work continues to influence advancements in communication technologies, showcasing the importance of inventors in shaping the future.