Mamoru Arayashiki

Title: Mamoru Arayashiki: Innovator in Frequency Modulation Technology

Introduction

Mamoru Arayashiki is a notable inventor based in Yokohama, Japan. He has made significant contributions to the field of frequency modulation technology, holding a total of 9 patents. His work has been instrumental in advancing communication devices and improving transmission efficiency.

Latest Patents

One of his latest patents is the "Two-point frequency modulation apparatus." This invention proposes a method to keep the spectrum of transmission waves within the spectrum mask. Voltage is supplied to the control voltage terminal of the voltage-controlled oscillator (VCO) according to modulation data via a noise shaper that attenuates more noise at higher frequencies. This results in a decrease in the signal level outputted from the phase-locked loop (PLL) circuit, allowing for effective two-point frequency modulation while maintaining compliance with the spectrum mask.

Another significant patent is the "Transmission device and radio communication device." This invention focuses on achieving preferable power efficiency and a wide control range of transmission output power. The pre-stage side of a high-frequency power amplifier adjusts the amplitude of a high-frequency phase modulation signal based on a baseband amplitude modulation signal and a gain control signal. A variable gain amplifier further modifies the amplitude, ensuring that the baseband amplitude modulation signal is effectively supplied to an amplifier via a linear-log converter.

Career Highlights

Mamoru Arayashiki has worked with prominent companies such as Matsushita Electric Industrial Co., Ltd. and Panasonic Corporation. His experience in these organizations has allowed him to develop and refine his innovative ideas in the field of communication technology.

Collaborations

Throughout his career, Arayashiki has collaborated with notable coworkers, including Masaharu Udagawa and Yoshihiro Hara. These collaborations have contributed to the successful development of his inventions and patents.

Conclusion

Mamoru Arayashiki's contributions to frequency modulation technology have made a significant impact on the field of communication devices. His innovative patents and collaborations with industry leaders highlight his role as a key figure in advancing technology.