An encoder can generate a series of codewords to signal to a decoder a mapping of range combinations for two or more metrics. The encoder can generate a first codeword to indicate a current combination being decoded maps to the same filter as the most recently decoded combination that shares the same range for the first metric. The encoder can generate a second codeword to indicate that the current combination maps to the same filter as the most recently decoded combination that shares the same range for the second metric. If the current combination does not map to the same filter as either of these most recently decoded combinations, then the encoder can generate a third codeword that indicates the filter that maps to the current combination.