| 摘要 |
PROBLEM TO BE SOLVED: To provide a signal processing device which determines whether a signal outputted from an own device is in an abnormal state in which the signal returns to an input circuit of own equipment via other device due to incorrect connection to the other device. SOLUTION: An extraction part 402 extracts a determination signal including a signal unique to own equipment and a time signal from an inputted signal, and the determination part 407 determines whether or not the determination signal is the one having been added immediately before by own equipment. If the determination signal is the one having been added immediately before by own equipment, the determination part requires a control part 403 to cut off the signal line. If the determination signal is not the one having been added directly before by own equipment, the determination part instructs an adding part 408 to add the determination signal to the output signal. COPYRIGHT: (C)2006,JPO&NCIPI
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