Patent ID: 7644001

Claim:
A method of coding an audio signal, the method comprising acts of: calculating, using a processor, values of a first number of first parameters representing aspects of the audio signal at a first instant to obtain first calculated values; calculating, using a processor, values of a second number of second parameters representing the aspects of the audio signal at a second, later, instant to obtain second calculated values, wherein the first number and the second number differ; and coding, using an encoder, a subset of the second parameters being associated with a particular portion of a frequency range of the audio signal based on a difference of a subset of the second calculated value(s) associated with this particular portion of the frequency range and a subset of the first calculated value(s) associated with substantially this particular portion of the frequency range to obtain differentially coded values of the second parameters, wherein the first parameters together and the second parameters together cover substantially the same frequency range, and wherein the number of first parameters is larger than the number of second parameters, the subset of the second calculated value(s) comprises one value for the particular portion of the frequency range being a sub-range of the substantially the same frequency range, the subset of the first parameters comprises at least two first calculated values, the differentially coded value corresponding to the one value being based on the difference of a mean value of the corresponding first calculated values and the one value.