Masashi Ohno

Title: Masashi Ohno: Innovator in Communication Technology

Introduction

Masashi Ohno is a prominent inventor based in Kokubunji, Japan. He has made significant contributions to the field of communication technology, holding a total of four patents. His innovative work focuses on enhancing speech transmission and network systems.

Latest Patents

One of Masashi Ohno's latest patents is a speech packet communication system. In this system, a transmitter, referred to as a speech terminal, linearly predicts a speech signal input at predetermined sample periods. It outputs the difference between the input speech signal and the prediction signal. The prediction coefficient used for linear prediction is adapted with an output differential coded value at each sample period, ensuring that the prediction value closely matches the input waveform. The difference between the input speech signal and the prediction signal is converted into a differential code. A packet is then prepared from multiple differential codes obtained during the relevant frame period and transmitted over a communication line. The bit accuracy indicative of the differential code and the bit accuracy for the differential coded value used for adapting the prediction coefficient are adjusted based on the characteristics of the input speech signal.

Another notable patent is related to a network system that connects multiple LANs, each linking several terminals. This system includes a LAN interconnection switching unit that switches and relays data. It receives data frames from the LANs and sends out a call set-up frame containing a call number assigned to the combination of source and destination terminal addresses. The data received from the LAN is segmented into packets, which are transmitted along with the call number. The interconnection switching unit employs a data frame error detection scheme to switch and relay data effectively. Information for controlling the switching sequence is added to the data frame to prevent interruptions caused by packets with different call numbers.

Career Highlights

Masashi Ohno has built a successful career at Hitachi, Ltd., where he has been able to apply his innovative ideas in communication technology. His work has significantly impacted the efficiency and reliability of communication systems.

Collaborations

Throughout his career, Masashi Ohno has collaborated with notable colleagues, including Yoshihiro Takiyasu and Toshiki P. Tanaka. These collaborations have contributed to the advancement of technology in their respective fields.

Conclusion

Masashi Ohno's contributions to communication technology through his patents and work at Hitachi, Ltd. highlight his role as