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OKI Technical Review

2004 No.200 Special Edition on Technologies that Support the e-Society

Development of Ubiquitous Sensor Network [418KB] PDF

Shigeru Fukunaga, Tadamichi Tagawa, Kiyoshi Fukui, Koichi Tanimoto, Hideaki Kanno

The ubiquitous sensor network is drawing a lot of attention as a method for realizing a ubiquitous society. Oki Electric has been making concerted efforts with ZigBee to realize a wireless LSI and a platform for feasibility tests, as well as develop various elemental technologies, with the aim to conserve energy and make settings easier.

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High grade IP Telephony Technology
- The Background of Development and Technology of the e-Sound IP Phone [327KB] PDF

Shinji Usuba, Hiromi Aoyagi

Since the inception of IP networks we have been developing a variety of VoIP products with a particular emphasis on the quality of sound for calls made over IP networks. This paper will first provide an overview of the sound quality assuring technology, followed by its aspects and the possibility for new communications in the full-IP full-broadband era that we entered into in recent years.

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The Development of MPEG4-AVC/H.264, the Next Generation Moving Picture Coding Technology [75KB] PDF

Zhixiong Wu, Takaaki Hatanaka, Masayuki Tokumitsu

Transmission of a much clearer content with more images over a network with a limited band is in strong demand. The existing moving picture coding technology, however, is inadequate to respond to such needs, although expectations for the next generation moving picture coding technology with higher compression rates is increasing. The summary of the MPEG4-AVC/H.264, which is the latest international standard for the coding of moving pictures, is introduced in this paper, followed by the introduction of the technical features of the high-quality MPEG4-AVC/H.264 CODEC of Oki Electric.

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Silicon on Sapphire (SOS) Device Technology [113KB] PDF

Toshiyuki Nakamura, Hideaki Matsuhashi, Yoshiki Nagatomo

As the elements of Silicon on Sapphire (SOS) devices are formed on insulating substrates, an extremely small parasitic capacity and high-speed operations can be obtained. Active elements, such as transistors and passive elements, such as inductors, have superior high-frequency characteristics, due to the extremely limited interaction they have with substrates. Since transistors are capable of completely depleting operations, their characteristics are suitable for consuming low amounts of power. At Oki Electric, we are proceeding with developments of LSI devices for the ubiquitous era, by utilizing the aforementioned superior characteristics. This paper describes the processes and structures of SOS devices, with comparisons to other devices, such as bulk silicon (Si), to provide descriptions of their characteristics, advantages and the future prospects of SOS devices.

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RF Circuit Technology that Realizes Wireless LSI Products [67KB] PDF

Takashi Taya, Shuji Ito, Nobumasa Higemoto

An RF circuit technology, developed by Oki Electric in order to realize low power consuming, highly sensitive and user-friendly wireless LSI products, will be described here with explanations on the features and effectiveness of the application on CMOS devices, as well as the one-chip integration of the RF circuit and digital circuit.

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