Patent ID: 8320393
Filing Date: 2012-11-27
Classification: E21B,G01V,H03K,H04B

Abstract:
1. An electrical signalling system, the electrical signalling system comprising: a modulator configured to produce an alternating signal comprising repeated rising and falling edges in which an information is encoded, the encoding being by way of a time difference between at least one of consecutive rising edges and consecutive falling edges; and a transmission path for the alternating signal from the modulator to a demodulator, wherein the demodulator is configured to detect the alternating signal, store a record of the alternating signal around a signal edge of the alternating signal, store a record of the alternating signal around a subsequent like signal edge, determine a difference between the record of the signal edge and the record of the subsequent like signal edge, and determine a time interval between the record of the signal edge and the record of the subsequent like signal edge that substantially minimizes the difference.