Patent ID: 6377633
Filing Date: 2002-04-23
Classification: H03K,H04L

Abstract:
An apparatus for digitally decoding asynchronous communication signals comprising:an analog-to-digital converter for converting analog communication signals having negative and positive signal peaks into binary signal values corresponding to the analog communication signals; a negative peak register and a positive peak register for storing the negative and positive peak signal values and the minimum negative and maximum positive signal values corresponding to the minimum, most negative peak signal value and the maximum, most positive peak signal value; a negative peak comparator and a positive peak comparator for comparing the positive and negative peak signal values of a currently received binary signal value with the minimum negative and maximum positive peak signal values stored within the negative and positive peak registers so as to update the negative and positive peak registers with new minimum negative and maximum positive peak signal values; a subtraction circuit for subtracting the positive peak signal value from the negative peak signal value to determine the magnitude signal value corresponding to the difference between a binary zero and one of the binary signal value; and an addition circuit for adding one half of the magnitude signal value to the minimum negative peak signal value stored in the negative peak register to obtain a threshold signal value to determine a mid-bit reference.