Association hardware for intelligent electronic systems

Tadahiro Ohmi, Tadashi Shibata, Koji Kotani, Tsutomu Nakai, Akira Nakada, Ning Mei Yu, Masahiro Konda, Tatsuo Morimoto, Yuichiro Yamashita

Research output: Contribution to journalArticlepeer-review


Aiming at real-time event recognition, basic association hardware was developed using neuron MOS (νMOS), a multi-input threshold processing element device. To store a large amount of past events as analog vectors, new rewritable analog EEPROM cells were first designed, featuring high-accuracy analog voltage control without `read/verify.' Besides, associator hardware was developed to detect and associate nearest stored events to input events. In addition, a circuit was designed for detection of motion vectors of 2D images as the most simple application of the associator, and it was shown that processing only takes several hundred nanoseconds, while even dedicated DSP requires about 10 ms. As an application of 2D image compression and processing, νMOS circuit for real-time center-of-mass detection was also developed. The salient feature of νMOS circuits is the unique combination of flexibility of analog processing with accuracy of digital processing. Appropriate use of analog processing is efficient in eliminating digital bottleneck. Besides, along with analog cicuitry development, vector quantization processor was designed as a digital circuit, and applied to real-time compression of moving images.

Original languageEnglish
Pages (from-to)52-62
Number of pages11
JournalSystems and Computers in Japan
Issue number12
Publication statusPublished - 1999 Nov 15

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Information Systems
  • Hardware and Architecture
  • Computational Theory and Mathematics


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