公开(公告)号：BR9200161A

公开(公告)日：1992-10-06

申请号：BR9200161

申请日：1992-01-17

Applicant: MOTOROLA INC

Inventor： DUCH KRZYSTOF M ,  FREEBURG THOMAS A

IPC: H03B28/00 ,  G06F1/035 ,  H03H17/06 ,  H04L25/49 ,  H04L27/04

Abstract: An apparatus scales binary samples representing a predetermined waveform (109) to achieve every possible transition in a multi-level transmission system. The predetermined waveform (109) is partitioned into M symbol intervals, each symbol interval having a corresponding waveform represented by a series of binary samples V stored in M separate ROM devices (311-316). Depending on the required amplitude and polarity of the transition, logic blocks (351-356) control scaling multipliers (321-326) and polarity multipliers (331-336) to perform the required scaling and inverting of the binary samples retrieved from ROM (311-316). The scaled and inverted samples are added together by an adder (345) and sent to a D/A converter (350) where the desired scaled and inverted waveform is converted/generated from the scaled and inverted binary samples.