| 摘要 |
PURPOSE:To obtain a filter output value through the operation of only additions, by storing a constant corresponding to a binary code sample value to a storage device for drawing. CONSTITUTION:Zero is added to a lower rank of the lowest ranking bit of a complement of 2 of code sample value Zi in M-bit, and N sets of sample values Zi'= ZiMZiM<-1>...Zi<2>Zi<1>Z<0> inverting polarity bit of Zi are prepared and N-dimension vector (Z0<j>Z1<j>... ZN-1<j>) is produced. A function value of phii<0>/2 is obtained by taking N- dimension vector (0,0...0) taking additional bit as each component from a storage device MEM2, as address value, storing a function value of phii<j>, and the value is added to a shift adder ACC2. Next, the function phii<j> is drawn by taking a vector (Z0<j>, Z1<j>...ZN-1<j>) as an address value from the MEM2 and added with a function value phii<0>/2 not shifted. A function value phii<2> is drawn from the MEM2 and it is added with the result of addition before. This operation is continued to the vector (Z0M, Z1M...ZN-1M). |
