PATTERN GENERATING CIRCUIT

摘要

PURPOSE:To generate a pattern signal subjected to high speed MB1 C code easily with a comparatively low speed and inexpensive element by applying MB1C coding to a code string in parallel input to N systems and applying serial conversion to the result. CONSTITUTION:A code string inputted synchronously in parallel with N-system A-D is selected in the unit of M+1 bits and a selection pulse is sent from the selection circuits 15-18 receiving the M+1-th bit code from a selection signal generator 20. Then the M+1-th bit code is replaced into A code being the inverson of the M-th bit code by inverters 11-14 to obtain N-system of parallel code strings (M bit 1 complementary code, MB1C code) regulated. The code is converted into a serial code string by a serial conversion circuit 19 to generate a pattern signal subjected to MB1C coding.