Company Filing History:
3 out of 372 
2 out of 90 
1 out of 149 
Years Active: 1995-1996
Title: Hisashi Naka: Innovator in Amplitude Modulation and Electric Field Sensing
Introduction
Hisashi Naka is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the fields of amplitude modulation and electric field sensing. With a total of 3 patents to his name, Naka's work showcases his innovative spirit and technical expertise.
Latest Patents
One of Hisashi Naka's latest patents is an amplitude modulation circuit and method. This invention involves a predetermined number of drivers and differentially switched power amplifiers arranged in pairs. The program sound signal is quantized and divided into bit groups, which are then distributed to the respective driver and amplifier pairs. Each driver selects phase-shift carriers based on the distributed bit group, allowing for a digital amplitude modulation that utilizes fewer power amplifiers than previous methods.
Another notable patent is an electric field sensor. This device includes a sensor head that varies the intensity of a light beam in response to the electric field intensity of an input signal. The sensor head comprises optical waveguides with variable refractive indices and a modulation electrode. This innovative design enhances the sensor's performance and sensitivity.
Career Highlights
Hisashi Naka has worked with notable companies such as Nippon Hoso Kyokai and Japan Radio Co., Ltd. His experience in these organizations has contributed to his development as an inventor and innovator in his field.
Collaborations
Throughout his career, Naka has collaborated with talented individuals, including Kazuhisa Hayeiwa and Yutaka Kojima. These partnerships have likely fostered a creative environment that has led to the development of his innovative patents.
Conclusion
Hisashi Naka's contributions to amplitude modulation and electric field sensing demonstrate his commitment to innovation and technology. His patents reflect a deep understanding of complex systems and a drive to improve existing technologies.