Patent ID: 7778824

Claim:
A device for frame lost concealment, wherein the device is configured to implement modules utilized for speech signal decoding, the device comprising: a lost frame detection module, configured to output a frame lost indication signal; a lost frame pitch period determination module, configured to receive the frame lost indication signal sent by the lost frame detection module, determine a pitch period of a current lost frame on the basis of a pitch period of the last good frame stored therein before the lost frame, and send the pitch period of the current lost frame; and a lost frame excitation signal determination module, configured to receive and store an excitation signal of the good frame sent from the upper-layer protocol layer, obtain an excitation signal of the current lost frame on the basis of the pitch period of the current lost frame sent from the lost frame pitch period determination module and the excitation signal stored therein; wherein the lost frame excitation signal determination module comprises: a good frame excitation signal output module, configured to receive and store the excitation signal of the good frame sent from the upper-layer protocol layer, receive the pitch period of the current lost frame output by the lost frame pitch period determination module, overlap and add an excitation signal of the last 1 m pitch periods of the current lost frame with an excitation signal of the last 1 to ( 1 + 1 m ) pitch periods of the current lost frame, and adopt the obtained excitation signal as the excitation signal of the last 1 m pitch periods of the current lost frame; adopt the excitation signal of the last 1 m to 1 pitch periods of the current lost frame stored therein as the excitation signal of 0 to ( 1 - 1 m ) pitch periods of the current lost frame; output the obtained excitation signal of one pitch period of the current lost frame, wherein the m is greater than 1; a lost frame excitation signal output module, configured to sequentially and repeatedly write the excitation signal of one pitch period sent from the good frame excitation signal output module into a buffer thereof for the excitation signal of the current lost frame.