Coding an audio signal wherein values of first parameters, which represent aspects of the audio signal at a first instant are calculated to obtain first calculated values and values of second parameters, which represent the aspects of the audio signal at a second, later, instant, are calculated to obtain second calculated values, wherein the number of the first parameters and the number of the second parameters differ. The values of the subset of the second parameters are coded based on a difference of this subset and a subset of the first calculated value associated with substantially a same particular portion of the frequency range. Thus the differentially coded values of the second parameters are obtained by coding the difference of the values of second parameters and first parameters which are associated with substantially the same frequency sub-range.