CPC H04N 19/124 (2014.11) [H04N 19/176 (2014.11); H04N 19/184 (2014.11); H04N 19/30 (2014.11); H04N 19/31 (2014.11); H04N 19/33 (2014.11); H04N 19/39 (2014.11); H04N 19/44 (2014.11)] | 18 Claims |
1. A method of encoding an input signal, the method comprising:
quantizing a set of data based on temporal information associated with said set of data, the set of data comprising coefficients corresponding to a frame of the input signal, the temporal information comprising an indication of those portions of the frame which are static and/or quasi-static with respect to one or more previous frames, the quantizing comprising:
determining a first quantization parameter for a first subset of data and a second quantization parameter for a second subset of data, the first subset of data and the second subset of data being subsets of the set of data selected in accordance with the temporal information, wherein the first quantization parameter and the second quantization parameter are different and are related according to a predefined formula,
wherein said quantizing includes subtracting a quantization offset value from a value associated with one coefficient included among the coefficients, and
wherein the quantization offset value is adjusted based on a sign of the one coefficient, said adjustment being performed to facilitate symmetrical operations about a zero value for the one coefficient.
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