| 摘要 |
A transmission apparatus for transmitting key operation information in a wireless signal form can avoid erroneous operation, even when a radio interference occurs between a transmission system and a reception system. A keyboard outputs a key make code when a key is depressed, and outputs a key break code when the key is released. Even when the keyboard is connected to a personal computer via a wireless signal, these key codes are transmitted utilizing the wireless signal. However, after the key make code is transmitted, if the key break code cannot be transmitted due to noise, then the personal computer cannot recognize that the relevant key is released. The transmission system (keyboard side) regularly transmits a fixed-term identification code (ID code) to the reception system (personal computer side). When the reception system cannot regularly detect the fixed-term identification code, the transmission system automatically transmits an all off code to the personal computer so as to notify that all keys are set under a break state. As a result, the transmission system can avoid the erroneous operation.
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