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    • 1. 发明授权
    • Circuit arrangement for forming the sum of products
    • 形成产品总和的电路布置
    • US5650952A
    • 1997-07-22
    • US695951
    • 1996-08-13
    • Alfred BaierJohannes SchuckDirk Weinsziehr
    • Alfred BaierJohannes SchuckDirk Weinsziehr
    • G06F7/50G06F7/509G06F7/544G06F7/00
    • G06F7/5095G06F7/5443
    • In processors, notably digital signal processors, it is often necessary to form the sum of products of a concatenation of data word pairs, for example for correlation or convolution operations, in which the one data word of each pair can assume only one of the two values +1 or -1. In accordance with the invention, in that case instead of forming a product in a multiplier, the one data word of each pair is applied to an add/subtract device in order to control the function thereof in respect of addition or subtraction; one input of the add/subtract unit then receives the other data words of the data word pairs, and the other input is connected to the output of the accumulator register. Thus, a complex multiplier device is saved or, should such a device be present anyway, it will not be used so that the power loss of the processor is reduced.
    • 在处理器中,特别是数字信号处理器,通常需要形成数据字对的级联的和,例如用于相关或卷积运算,其中每对的一个数据字只能承担两个中的一个 值+1或-1。 根据本发明,在这种情况下,代替在乘法器中形成乘积,每对中的一个数据字被应用于加法/减法器件,以便控制加法或减法的功能; 然后,加/减单元的一个输入接收数据字对的其他数据字,另一个输入连接到累加器寄存器的输出。 因此,保存复数乘法器装置,或者如果这样的装置出现,则不会使用它,以致减少了处理器的功率损耗。