| 摘要 |
An encoding/decoding system using a battery voltage (26) as a keyword includes transmitters (11), (12) and receivers (13), (14) on a network. Each of the transmitters and the receivers has a storage unit (35) and a keyword deriving unit (33) having a central processing unit (34) which monitors a voltage of a battery, which loads the battery voltage a plurality of times 5 minutes after the battery voltage decreases to 12 V, which calculates an average voltage from a plurality of voltage values recorded on the storage unit (35), and which records the average voltage on the storage unit (35) as keywords for the next encoding and the next decoding. |
