Casio Computer Co., Ltd.

Oki Electric Industry Co., Ltd.

Tokyo Fm Broadcasting Co., Ltd.

Masaharu Kizaki

Masao Kawamura

Yoshihiro Shona

Takahiro Fuse

Koji Yamagishi

Haruo Ono

Takao Kanke

Kazuya Kawano

Naruhiko Nihira

Shigeru Shibazaki

Kazuyuki Odachi

Yasuichi Kaku

Scrambled information transmitting and receiving method

A communication system can maintain high security in communication between a communication apparatus and a terminal. The communication system includes the communication apparatus and the terminal provided with a memory unit for storing data for specifying function of the communication apparatus. The communication apparatus and the terminal include random number generators for generating random numbers, encryption/decryption key preparing units for preparing encryption/decryption keys on the basis of both random numbers and generated by the respective random number generators of the communication apparatus and the terminal and a secret key held in common by the communication apparatus and the terminal, and encryption/decryption processing units for encrypting or decrypting communication data between the communication apparatus and the terminal containing the data by means of the encryption/description key, respectively.

Communication system and communication method

A liquid crystal projector which comprises image light-refracting means for deflecting the direction in which ligh beams permeating liquid crystal display panel is projected on a screen by an angle corresponding to the suitable viewing angle of the liquid crystal display panel, and wherein image light thus refracted is thrown on a screen in an enlarged form by means of projection lens systems.

Liquid crystal projector

A television video signal A/D converter apparatus in a liquid crystal television receiver has an A/D converter for A/D converting a television video signal. Upper and lower reference potentials for determining an operating voltage amplitude are supplied to the A/D converter from a reference potential generator. The upper and lower reference potentials are divided at a given ratio by a resistor so as to fix an average potential of the television video signal at a constant value using the potential at the dividing point as a bias potential, and thereafter the television video signal is supplied to the A/D converter.

Television video signal A/D converter apparatus

Growing community of inventors

Oume, Japan

Masaharu Kizaki