| 摘要 |
<p>An audio signal coded by successive frames is represented by a binary stream (F) received with data (BFI) signalling possible erased frames. For each frame, the method consists in filtering the excitation signal (Ek(n)), formed on the basis of excitation parameters (EX(n)) recovered in the binary stream (valid frame) or estimated otherwise (erased frame), using a synthesis filter (22) to obtain a decoded signal (Σ¿n?(t)). A linear prediction of the decoded signal is carried out up to the preceding frame to estimate a synthesis filter relative to the current frame. The synthesis filters used as long as no frame is erased are in conformity with the estimated synthesis filters. If one frame n0 is erased, the synthesis filter used for a subsequent frame n0+i is determined by a weighted combination of the estimated filter relative to the frame n0+i with at least one synthesis filter used since the frame n0.</p> |
