Fujitsu Corporation

Nobuhide Maruo

Makoto Saotome

Yasuhiro Arai

Yoshiaki Narita

Makoto Kotani

A communication device is constructed to include a detecting section for detecting a signal peculiar to a universal serial bus (USB) obtained via the USB, and a disconnecting section for disconnecting a line which is being used for a communication when the signal peculiar to the USB is not detected by the detecting section within a predetermined time.

Communication device disconnecting a communication line by detecting an abnormal state of computer equipment

An electronic apparatus comprising a radio transmitter is disclosed. In a computer system () having a radio transmission circuit () of a phase modulation type supplied with power from a power supply () of a switching type, the switching frequency of the power supply () is determined based on the comparison frequency for the sampling operation of a PLL circuit () of the radio transmitter, thereby removing the power noises generated from the switching regulator of the radio transmitter of a phase modulation type.

Electronic apparatus having radio transmitter

A modem unit is adapted to be coupled between a land or radio telephone line and a terminal equipment. The modem unit is provided with a modem circuit for modulating data received from the terminal equipment and for demodulating data transmitted to the terminal equipment. Additionally an isolation circuit for providing a DC isolation between the telephone line and the terminal equipment is included. The modem circuit and the isolation circuit are respectively provided on a single modem integrated circuit card.

Growing community of inventors

Kawasaki, Japan

Nobuhide Maruo