Patent ID: 8359199

Claim:
A method of frame erasure concealment, comprising: detecting a frame erasure; computing a probability of an observation sequence based on a decoding algorithm in response to detecting the frame erasure; and deleting an observation vector of the observation sequence, the observation vector associated with the frame erasure, wherein deleting the observation vector of the observation sequence comprises: measuring a Euclidean distance between line spectrum pairs of contiguous frames, wherein the Euclidian distance is given by ∑ i = 1 p ⁢ ( ω n , i - ω n - 1 , i ) 2 = ( 1 - c ) ⁢ ∑ i = 1 p ⁢ ( ω n - 1 , i - ω dc , i ) 2 , wherein ω n,i represents an i-th line spectrum pair of an n-th frame, ω dc,i represents an empirical mean value of the i-th line spectrum pair, and c represents a forgetting factor; defining a steady-state threshold; and deleting a frame of the contiguous frames in response to determining that the Euclidean distance is less than the steady-state threshold.