| 摘要 |
A device for real time computing of a sum of terms having the form .SIGMA.h(iT).qe((n-i)T) is suitable for use in an echo canceller for a data transmission system using code 2B 1Q. The device first transforms each of the successive estimated values of ?e into transformed values ??e which are powers of two, by adding or subtracting 1. The successive elementary products each obtained by a shift of h by an amount selected in response to the respective value of q?e. The elementary products are summed in a register. |
