| 摘要 |
PURPOSE:To increase a dynamic range by selecting a sign bit which corresponding to that of input data when the sign bits of the input data and threshold- level data are equal. CONSTITUTION:A gate 10 is provided for exclusive OR between input data and threshold-level data, and the output data of an adder 1 which adds the input data and threshould-level data mutually or the input data is selected by a selector 11 corresponding to the output of the gate 10. When the input data and threshold-level data has the same sign, the selector 11 selects and applies the sign bit of the input data to a D type FF3, where the sign bit is latched. When the input data and threshold-level data have different signs, the adder 1 never causes an overflow, so the sign bit of the output data of the adder 1 is selected by the selector 11 and applied to the D type FF3. |
