FIELD: information technology.
SUBSTANCE: method is provided for concealing a transmission error in a digital signal broken down into a plurality of successive frames associated with different time intervals in which, at reception, the signal may contain erased frames and normal frames, the normal frames containing information (inf.) relating to the concealment of frame loss. The method is implemented during hierarchical decoding using core decoding and transform-based decoding using low-delay windows introducing a time delay of less than a frame with respect to the core decoding. To replace at least the last frame erased before a normal frame, the method comprises: a step (23) of concealing a first set of missing samples for the erased frame, implemented in a first time interval; a step (25) of concealing a second set of missing samples for the erased frame taking into account information of said normal frame and implemented in a second time interval; and a step (29) of switching between the first set of missing samples and the second set of missing samples so as to obtain at least a part of the missing frame.
EFFECT: improved quality of decoded signals during loss of data units by improving quality of concealing erased frames in a low-delay hierarchical coding system.
10 cl, 7 dwg
