Matsushita Electric Industrial Co., Ltd.

Akihiro Matsubara

Masahiro Shigyo

During a communication, when frame sync is lost in the receiver section of a spread spectrum communication apparatus, after the said sync is recovered, ID certification is practiced when the field intensity just before the loss is strong, or skipped when the said intensity is weak, and then the communication is resumed. Thus, the communication interrupt time due to the loss of sync is reduced.

Spread spectrum communication apparatus

A radio apparatus using a limited channel scan mode is provided. In the limited channel scan mode, a parent unit scans for transmitting within a limited channel group determined on the basis of the last channel used, and a child unit intermittently scans for receiving within the same limited channel group. Since not all channels are scanned, the working time of the child unit during one scan period is shortened and the battery power is saved. When interference occurs during communication, the channel being used is switched and the channel group thereafter is thus also changed.

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Fukuoka, Japan

Akihiro Matsubara