High speed analog echo canceller

摘要

An echo canceller stores echo signals in a plurality of sample and hold circuits. These echo signals are selectively switched to the input of a summing amplifier for subtraction from a data plus echo signal. A training sequence detector is utilized to detect the statistical occurrence of a predetermined training signal embedded within a stream of data. The echo canceller requires no analog to digital conversion or digital processer and operates at very high speeds. The circuit may be implemented in integrated circuit form at very low cost.