“…e fierce debate on missing fundamental led to the calculation of fundamental frequency, and many algorithms flourished to extract and track the pitch of a signal. Among the most notables are AMDF [18][19][20], autocorrelation [13][14][15][16][21][22][23][24][25], cepstrum [26][27][28], harmonic product spectrum, period histograms [29][30][31], parallel processing methods [32][33][34], simplified inverse filter tracking (SIFT) [35], comb filters [36], data reduction [37], LPC-based spectral equalization (unpublished), spectral sieves [38], harmonic spacings and structures [39][40][41], LPC inverse filtering [20], feature based [42], IPTA [43], harmonic pattern recognition [44], envelop analysis, threshold-crossing analysis (ZXABE, TABE, TTABE) [45,46], subharmonic summation [47], subband processing [48], superresolution [49], two-way mismatch [50], resolution improvement [51], TEMPO [52], RAPT (NCCF) [53], instantaneous frequency [54][55]…”