Patent ID: 8041564

Claim:
A method for detecting echo residue associated with a speech application, the method comprising: filtering audio data to determine whether the audio data should be further analyzed; correlating audio data from an input channel with audio data from an output channel to obtain a correlation result; comparing a determined value of the correlation result with a predetermined threshold; and categorizing the audio data for the input channel as including an acceptable level of residual echo when the determined value of the correlation result is greater than the predetermined threshold, and categorizing the audio data for the input channel as including an unacceptable level of residual echo when the determined value of the correlation result is less than the predetermined threshold, wherein the filtering further comprises determining whether a duration of a user input is at least a predetermined duration, and when the user input is at least the predetermined duration, extracting the predetermined duration of the user input from a total duration of the user input for further analysis, and when the user input is not at least the predetermined duration, ending the analysis.