Controller of digital key signal

Abstract

Abstract PURPOSE:To control the timing of an edge part at an optional value, by detecting the front and rear edges of a digital key signal and enlarging or compressing of the data of each detection by a prescribed degree based on an indication. CONSTITUTION:A digital key KEY is supplied to a shifting/rough control circuit 38 and then fed to a fine control circuit 39. These circuits 38 and 39 are controlled by a control logical circuit 40 which receives the supply of the data and the control signal from a microprocessor. Then the front and rear edges of the signal KEY are enlarged and compressed at every sampling period and by the outputs of the RAM42-44 that prescribe the degree of enlargement and compression of the edge of the circuit 38 and a level comparator 45 that detects the front and rear edges of the signal KEY. Then the signal received a rough control is fed to the circuit 39 including a buffer memory 57 plus RAM58 and 59. Thus both edges are enlarged or compressed within a clock period.

Inventors

• 👤 Yoshikazu Yamamoto
• 👤 嘉一 山本

Bibliographic Details