| 摘要 |
PURPOSE:To relieve the load of the software and to attain high processing speed by using a ROM so as to apply conversion to a data expression specific to a D/A converter to a digital data with two complement expression and limit processing of data at the outside of the input range of the D/A converter. CONSTITUTION:When an input data 1 is given to address lines A0-A15 of conversion table storage ROMs 2, 3, the ROMs 2, 3 output a data corresponding to the address according to the conversion table. In this case, the time until the data is outputted is equal to the memory access time and short negligibly in comparison with the case by the software realization. Thus, the data conversion is performed in real time sufficiently. The output data of the ROMs 2, 3 is inputted to a D/A converter 4, which converts into an analog signal 5 and outputs it.
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