| 摘要 |
PURPOSE:To prevent the generation of a noise due to an overflow by performing level clipping operation when an input digital signal overflows. CONSTITUTION:When a signal of the MSB of the output digital signal of a holding circuit 6 and a signal of the 2nd bit one bit higher than a bit constituting the 2nd bit of a final output differ in sign, an overflow occurs and the output signal of an exclusive OR circuit 13 has logic 0, so a data selector 14 performs switching to output a signal having a different sign from the MSB from an inverter 11 to input terminals A1-An-1. Thus, the overflow is detected securely to perform clipping without level variation, thereby preventing the generation of a noise. |
