Company Filing History:
Years Active: 1988-1993
Title: Minoru Ishikawa: Innovator in Data Channel Access Technology
Introduction
Minoru Ishikawa is a notable inventor based in Tochigi, Japan. He has made significant contributions to the field of data channel access technology, holding a total of 3 patents. His work focuses on improving the efficiency and functionality of communication systems.
Latest Patents
One of Ishikawa's latest patents is a drop/insert multiplexer for data channel access units. This innovative multiplexer enhances the use of common channel slots for data channels in both first and second directions, while minimizing wiring requirements between the multiplexer/de-multiplexer section and the channel section. The design includes a time slot phase difference setting stage that provides a predetermined phase difference between received timing signals and the received data. Additionally, it features a receive channel pulse generating stage, a receive channel pulse decoding stage, and a PCM decoder that reproduces voice signals from selected received data. On the sending side, a time slot phase difference correcting stage ensures accurate channel data transmission in both directions.
Another significant patent is a channel access system that comprises multiple channel parts for receiving voice signals and outputting voice frequency data and signaling data. This system includes a multiplexer part that processes the voice frequency and signaling data, supplying channel access signals to the channel parts. Each channel part is equipped with a coder, decoder, signaling converter, and a speed converting circuit, which work together to ensure synchronized and efficient data transmission.
Career Highlights
Minoru Ishikawa is currently employed at Fujitsu Corporation, where he continues to develop innovative solutions in the field of telecommunications. His expertise in data channel access technology has positioned him as a key contributor to advancements in this area.
Collaborations
Ishikawa has collaborated with notable colleagues, including Nobuki Nakata and Toru Kosugi. Their combined efforts have led to significant advancements in communication technologies.
Conclusion
Minoru Ishikawa's contributions to data channel access technology through his patents and work at Fujitsu Corporation highlight his role as an influential inventor in the telecommunications industry. His innovative designs continue to shape the future of communication systems.