Nippon Telegraph & Telephone Co.

Hiroshi Yamane

Masaharu Sao

Tetsuya Tominaga

Masao Masugi

Yoshiharu Akiyama

A clock signal extractor () is connected to an interface of an information equipment () for processing an information signal, to extract a clock signal component from the information signal. A clock signal generator () generates a pseudo clock signal having an optional phase difference relative to the clock signal component extracted by the clock signal extractor (). A prevention signal generator () generates, based on the pseudo clock signal generated by the clock signal generator (), a leakage prevention signal having an electromagnetic wave strength stronger than electromagnetic waves leaking from the information signal. A prevention signal output unit () outputs the leakage prevention signal generated by the prevention signal generator ().

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Tokorozawa, Japan

Hiroshi Yamane