Systems, methods, apparatus, and computer readable media for encoding harmonic signals

A method of audio signal processing, said method comprising: in a frequency domain, the location of a plurality of peaks in a reference audio signal; selecting an Nf number of candidates for a fundamental frequency of a harmonic model, each based on the location of a peak corresponding the plurality of peaks in the frequency domain. based on the locations of at least two of the plurality of peaks in the frequency domain, calculating a number Nd of candidates for a separation between harmonics of the harmonic model; for each of a plurality of different pairs of candidates of the fundamental frequency and harmonic separation, the selection of a set of at least one subband of an audio signal destination, in which a location of each subband in the assembly in the frequency domain it is based on the pair of candidates; for each of the plurality of different pairs of candidates, calculating an energy value from the corresponding set of at least one subband of the audio signal destination; and based on at least a plurality of calculated energy values, selecting a candidate pair among the plurality of different pairs of candidates, wherein at least one among the Nf and Nd numbers has a value greater than one.