Hitachi Denshi Kabushiki Kaisha

Itsuo Ishida

Toshiyuki Akiyama

Nobuo Tsukamoto

Atsushi Miyashita

Tatsuhiro Nakada

Seiichi Sano

Hiroyuki Takesue

Hisao Koda

A data transmission system for transmitting data from a transmitter to a receiver located away therefrom. The transmitter includes circuitry for transmitting together a main signal having a carrier modulated with main data to be transmitted and as well as a sub-signal to be used in frequency conversion and generated by modulating a carrier of a predetermined frequency out of a frequency band of the main signal. The receiver includes circuitry for receiving a receive signal from the transmitter and extracting the sub-signal therefrom and also includes circuitry for generating a signal to be used as a reference at the time of converting the receive signal to a signal having a predetermined frequency on the basis of the extracted sub-signal.

Data transmission system, data transmission communication station, and data transmission method

Growing community of inventors

Sayama, Japan

Itsuo Ishida