Patent ID: 7908140

Claim:
A method of performing frame erasure concealment (FEC) related to received frames of compressed audio signal, comprising the steps of: when a frame of compressed audio signal is received, decoding the received frame to form n decoder-produced audio samples (hereinafter, DPA samples), and storing said DPA samples in a buffer; when, following receipt of said frame, a next-expected frame is unavailable; determining a pitch period of audio signal represented by audio samples stored in said buffer; forming a synthesized signal of m+n samples by: performing an overlap-add (OLA) to form a first portion of the synthesized signal, where m is a number of DPA samples in a quarter of said pitch period, said OLA using: the m earliest DPA samples of the most recent samples stored in said buffer corresponding to one and a quarter of said pitch period, and the m most recently stored DPA samples in said buffer, when said pitch period corresponds to n or more audio samples, appending to the first portion of the synthesized signal n earliest DPA samples of the most recent samples stored in said buffer corresponding to said pitch period, and storing said synthesized signal in said buffer; and outputting DPA samples and samples of said synthesized signal.