| 摘要 |
PURPOSE:To prevent overflow by providing a means for changing the order of additions of plural digital signals in addition. CONSTITUTION:Plural delay means are formed by delaying an input digital signal and/or an output digital signal by plural stages of delay means 1 at each word for instance. A prescribed coefficient is multiplied to each delay signal by a coefficient multiplication means 2 and the result is added by an addition means 3. A means 4 for changing the order of addition is provided in order to eliminate the overflow of the means 3 or decrease the frequency. The means 4 has a function which changes the order of additions through the detection of overflow occurred in, e.g., the means 3 or decides the order of additions in advance so as not to produce overflow based on the result of multiplication of coefficients independently of the detection of overflow. |
