Matech, Inc.

Itx E-globaledge Corporation

Link Evolution Co., Ltd.

Gontaro Kitazumi

Takeshi Ohyama

Akihiro Yamada

Masanori Naritomi

Masahisa Masuda

Shin-ichi Nagamura

Kazuhisa Terasaki

Kenji Nakamura

A full duplex talking audio circuit uses a single transducer Zwhich, even when various characteristics including the strength of a transmission signal change from moment to moment, enables the adequate operation of an echo canceling function and sufficiently compensates for the deterioration of the frequency characteristics of the transmission signal due to the acoustic transfer characteristics of the human body.

Single transducer full duplex talking circuit

An infrared communication adapter which can carry out a data exchange with an external equipment having an infrared communication interface even though a portable telephone does not have an infrared communication function. The adapter includes a portable telephone side connecting section for transmitting a serial data supplied from the portable telephone by connecting an external communication interface of the portable telephone; an infrared communication interface for carrying out a data communication with the external equipment in accordance with the infrared communication protocol. The adapter analyzes a communication protocol of the communication interface disposed on the data supply side and carries out an RSC emulation internally to transmit the data by converting the analyzed communication protocol into a communication protocol corresponding to a communication interface disposed on the data receive side.

Infrared communication adapter

A key-board type input mechanism suitable for inputting large quantity of data is provided to a portable information technology device having a pen-input type display device. A keyboard (or) of the present invention comprises a key top panel portion (or) on which a plurality of input key portions (or) that are pressed down when carrying out a key input are integrally formed, a coordinate position information generating portion () and contact portions (or) for changing loads generated by pressing each input key portion of the key top panel portion down into a vertical load, a load distribution portion (or) for distributing unnecessary loads other than the vertical load changed by the coordinate position information generating portion and the contact portions, by deformation under a pressure. The key top panel portion, coordinate position information generating portion, contact portion, and load distribution portion are layered.

Keyboard type input device and portable information processor

Growing community of inventors

Tokyo, Japan

Gontaro Kitazumi