| 摘要 |
PURPOSE:To attain the high computing accuracy with a small circuit scale by using an orthogonal transformation arithmetic circuit to apply the orthogonal transformation to the data of a complement form and applying a positive- negative symmetrical rounding process to the conversion output. CONSTITUTION:An orthogonal transformer 1 converts an input signal of N1 bits into a signal of (N2 - L) bits smaller than N1 bits and outputs it. This signal is converted into a signal of N2 bits within the converter 1 via an orthogonal transformation arithmetic circuit 2 to undergo a rounding process symmetrical to level 0. Thus the signal of N2 bits is rounded into a signal of (N2 - L) bits via a rounding ROM 3 and outputted. In this case, the average values of computing errors obtained by the rounding processes are all set at 0. Thus the high computing accuracy is secured with a small circuit scale. |
