| 摘要 |
A system is described that provides a full end to end test of a recorder system to assure that a failure of any one or more channels is quickly detected so that maintenance can be performed. The system causes the recorder to sequence all or some of its outputs so that they appear sequentially on one (or more to increase speed) video signal line. The testing system uses one (or possibly multiple) testing circuits to check the signal from each recorder channel as it appears in the sequence. If one or more channels are inoperative, they are identified and a maintenance needed alarm is generated. The sequence includes a pause or similar discontinuity so that the tester can synchronize to the sequence so that the specific identifier of a channel can be identified with the detected operating status. This identification is also possible from communication between the tester and the recorder. The system can automatically transfer a failed channel to a spare channel to allow continued recording until maintenance corrects the failure. A method is described to deal with stationary camera scenes so that a static non moving image is not confused with a failed channel. The system can be used with existing installed systems, included with new systems, or fully integrated into new recorder designs.
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