9. The method for multi-pass echo residue detection of claim 5 , further comprising: checking an amplitude of the predetermined duration of the user speech input when the consistent noise in the predetermined duration of the user speech input is determined to be equal to or above the first predetermined consistent noise threshold, and equal to or below the second predetermined consistent noise threshold.
5. The method for multi-pass echo residue detection of claim 1 , further comprising: root mean square filtering the predetermined duration of the user speech input to determine the level of consistent noise in the predetermined duration of the user speech input.