This inventor holds 3 USPTO granted patents. Top assignee: Mitsumi Electric Company Ltd.. Active years: 1999-2002.
Company Filing History:
Years Active: 1999-2002
Title: Tsuyoshi Hirabuki: Innovator in Optical Disc Technology
Introduction
Tsuyoshi Hirabuki is a notable inventor based in Chofu, Japan. He has made significant contributions to the field of optical disc technology, holding a total of 3 patents. His work focuses on enhancing the performance and efficiency of optical disc apparatuses.
Latest Patents
Hirabuki's latest patents include a demodulation circuit, a decode circuit, and a digital PLL circuit for an optical disc apparatus. The demodulation circuit performs FSK demodulation by utilizing a binary signal obtained from a signal reproduced from an optical disc. This signal contains an FSK modulation signal that has been previously recorded. The circuit measures the edge interval of the binary signal and derives an FSK modulation component based on the difference between the measured edge interval and a predetermined reference value. A moving average of the FSK modulation component is used to obtain a demodulation value, which is then compared to a reference value to produce a binary FSK demodulation signal.
Additionally, the decode circuit is designed to decode binary data from a biphase code signal reproduced from the optical disc. It corrects binary data when an inversion of the biphase code signal is not performed at the end of a bit. Furthermore, the digital PLL circuit divides the frequency of the demodulated signal by a predetermined ratio, generating a clock signal based on the edge interval value of the divided modulated signal.
Career Highlights
Hirabuki is currently employed at Mitsumi Electric Company Ltd., where he continues to innovate in the field of optical disc technology. His work has been instrumental in advancing the capabilities of optical disc apparatuses, making them more efficient and reliable.
Collaborations
One of his notable coworkers is Isao Okada, with whom he has collaborated on various projects within the company.
Conclusion
Tsuyoshi Hirabuki's contributions to optical disc technology through his patents and work at Mitsumi Electric Company Ltd. highlight his role as a significant innovator in this field. His advancements continue to influence the development of optical disc apparatuses.