Multiple encoding optimizes Method

This invention relates to the encoding compression of digital signals such as multimedia signals (audio or video), and more particularly to a multiple coding method, wherein an input signal is fed in parallel multiple coders each comprising a succession of functional blocks. According to the invention: a) the functional blocks are identified (BF10, ..., BFnN) forming each coder, as well as one or more functions performed by each block, b) marking functions that are common to an encoder to another, etc.) it performs these common functions, once for all, for at least part of all encoders, within at least one module (BF1CC, ..., BFnCC).