| 摘要 |
PURPOSE:To prevent the read-out of a wrong data which is caused by disappearance of a data in the memory, by comparing in order contents of the memory for storing a data required for operation of the main device, with contents of an ROM storing all the data that are used by the main device. CONSTITUTION:As soon as a main device 14 such as a video tape recorder, etc. reads out a data of a channel to be recorded on a video tape, from a memory 12, a data of the memory 12 is sent to a comparator 22 through a data reading circuit 20, and in this circuit, said data is compared in order with a data of an ROM24 storing all the data that are used by the main device 14. In this case, when a data of the memory has disappeared, the data becomes ''1'' or ''0'' at random, and does not coincide with each data of the ROM24, therefore, the comparator 22 supplies a detecting signal to an initial value setting circuit 26 and a displaying circuit 28. In this way, the initial value setting circuit 26 sets a suitable and effective data to the memory 12, such as error as the main device 14 executes no recording on a video tape is prevented, and also the read-out of a wrong data is prevented by displaying a faulty state by a displaying circuit 28. |
