| 摘要 |
PROBLEM TO BE SOLVED: To detect a fault in real time even when the fault occurs only in a sound signal of one system in the duplex transmission of sound signals. SOLUTION: Feature quantities of small areas of the sound signals transmitted by an active system and a reserve system are extracted by signal feature quantity calculation parts 6-1, 6-2. A feature quantity comparison part 7 compares the extracted feature quantities between the systems and determines that the fault occurs in either of the systems. Feature quantity difference calculation parts 9-1, 9-2 calculate differences between the feature quantity of a fault area and the feature quantity of a normal area in each system and a [D] comparison part 10 and a fault system determination part 11 determines that the fault occurs in a system of which the calculated difference is larger. The reliability of determination is further enhanced by providing a majority processing part 12 and a significance determination part 13. COPYRIGHT: (C)2005,JPO&NCIPI
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