Error correction in an echo pulse is performed by periodically generating a parabola derived from a selected part of the pulse leading edge. The first and second substrates are arranged so that the first electrode layer overlaid with the semiconductor film and the second electrode layer are opposite each other with an electrolyte disposed therebetween. In another embodiment, a reduced subset of a collected data set is used for OCT Angiography data analysis. The playout controller references network delay estimates provided by a network delay estimator, and codec information such as the LMOS, DMOS, and MMOS provided by a codec detector to determine playout delays for the packets of the playout buffer.