| 摘要 |
A signal processing device including spare (redundant) signal processors simplified in their configurations and simple in their management may be obtained by this invention. Switch units corresponding to N signal processors in use, of switch units (33-1 through 33- (N+1)), are brought into conduction, and the switch unit corresponding to the remaining one signal processor set as a spare and placed in a standby state is brought to a cut-off state. Signals outputted from the switch units (33-1 through 33-(N+1)) are added together and the result of addition is sent to a CATV transmission path (13). When any of the N signal processors in use fails and a user inputs information about its failure through an operation unit (35), the faulty signal processor is newly kept in reserve and standby state. As an alternative to this, each signal processor kept in reserve and standby state up to now is placed in a used state. Thereby, it is possible to construct a spare signal processor as being unfixed. |
