Matsushita Electric Industrial Co., Ltd.

Tadahisa Kamiya

Iwao Matsuura

Hideki Yagita

Koji Hakamata

A clock control apparatus () receives wireless frequency information of a wireless communication apparatus () from an information communication apparatus (). Also, the clock control apparatus () detects an operation clock frequency of a main CPU (). Then, when the multiplied operation clock frequency coincides with the wireless frequency, the clock control apparatus () lowers a voltage of the operation clock of the main CPU () to a minimum voltage value at which the operation of the main CPU () is guaranteed. Alternatively, the clock control apparatus () may shift the clock frequency, or may frequency-modulate the clock frequency.

Data communication apparatus

When the antenna is extended, the length of the &frac12;&lgr; whip antenna,operates as an antenna thus causing only a negligible quantity of high-frequency currents to flow into the ground for the first circuit board,. When the antenna is housed, the entire length of a &frac14;&lgr; helical antenna,and a metalized &frac14;&lgr; radial of the first enclosure,operates as an antenna thus causing only a negligible quantity of high-frequency currents to flow into the ground for the first circuit board 106. Because the length of the antenna is &frac12;&lgr; both when the antenna is extended and housed, only a negligible quantity of high-frequency currents to flow into the high-frequency circuit via the ground for the first circuit board

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Shizuoka, Japan

Tadahisa Kamiya