Patent ID: 7593483

Claim:
A digital modulator for receiving a digital input signal and converting the digital input signal into an analog signal, comprising: a loop filter; a quantizer coupled to the loop filter, wherein the quantizer is configured to receive an input signal from the loop filter and generate an output signal having a quantizer level of a plurality of quantizer levels; and a mapper coupled to the quantizer, wherein the mapper is configured to map the output signal from the quantizer to an output sequence comprising a plurality of symbols, and wherein the mapper includes: definition means for defining a first sequence and a second sequence for each one of the plurality of quantizer levels, and generation means for selectively generating the output sequence, wherein the output sequence is one of the first sequence and the second sequence corresponding to the quantizer level of the output signal from the quantizer, wherein each transition of symbol value in the output sequence is separated by at least two symbols of a transitioned-to symbol value from a next transition of symbol value in the output sequence.