Patent ID: 7574354

Claim:
A method for a transcoder for transcoding between a first compression codec and a second compression codec, said first and second codecs being of pulse type and using multipulse dictionaries in which each pulse has a position marked by an associated index, wherein the method comprises the steps performed by the transcoder: a) the transcoder adapting coding parameters between said first and second codecs; b) a decoder of the transcoder obtaining from the first codec a selected number of pulse positions and respective position indices associated therewith; c) for each current pulse position of given index, a module of the transcoder forming a group of pulse positions including at least the current pulse position and the pulse positions with associated indices immediately below and immediately above the given index; d) selecting as a function of pulse positions accepted by the second codec at least some of the pulse positions in an ensemble constituted by a union of said groups formed in step c); and e) sending the selected pulse positions to the second codec for coding/decoding from the positions sent; said selection step d) then involving a number of pulse positions less than the total number of pulse positions in the dictionary of the second codec.