decoder and method to extract signal from down-set earpiece, decoder to extract down-mix signal spatial stereo, receiver or reproducer and method of receiving or reproducing audio and storage media. this invention refers to the down mix for earphones (314) that can be efficiently extracted from a parametric conversion of multichannel into stereo from a sign of multichannel (312),when modified phthalates (310) (head transfer function) are extracted from phthalates (308) from a multichannel signal using a level parameter (306) with information on the level relationship between two channels of multichannel signals in such a way that the modified phthalates (310) are more stronglyinfluenced by a channel with a higher level of phthal (308) than a channel with a lower level of phthal (308). Modified phthalates (310) are extracted in the decoding process taking into account the relative strength of the channels associated with the phthalates (308). phthalates (308) are thus modifieds in such a way that a down mix (314) of the parametric representation of a muytic anal signal can directly be used to promote the synthesis of the down mix for the earphones (314) without the need for a total intermediate parametric multichannel reconstruction of the parametric conversion of muiticanals in stereo signal.
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