Patent ID: 6693967
Filing Date: 2004-02-17
Classification: H03M,H04B,H04L

Abstract:
For a signal processing application, a method of detecting line encoding in accordance with one of a plurality of encoding algorithms in a signal transmitted through a telecommunication channel, the method comprising the steps of:(a) generating the signal comprising a set of test levels, wherein each of the test levels is selected based on the relative difference between each of the plurality of encoding algorithms when encoding a test level, and all of the encoding algorithms encode one of the test levels to generate a substantially equivalent value; and (b) comparing a combination of the test levels transmitted through the communication channel to a decision metric, wherein the decision metric is based on a measure of the difference between one or more of the set of test levels prior to being transmitted through the communication channel to each corresponding one or more of the set of test levels after the signal is transmitted through the communication channel, and wherein the one test level encoded by all of the encoding algorithms to generate a substantially equivalent value is employed to normalize the corresponding remaining test levels for the signal i) prior to and ii) after the signal transmission through the communication channel; and (c) detecting the line encoding according to one of the encoding algorithms based on the comparison of the combination with the decision metric.