Figure 7. Rank-frequency distribution of timbral code-words (window = 1,000 ms) and Yule-Simon model with memory [13] per database.

Gen. Model stands for the computed generative model. For clarity's sake the curves for non-Western Music, Western Music, and Speech are shifted up by one, two, and three decades respectively. The model's parameters , , and were manually adjusted to match the experimental data. They correspond to the probability of adding a new code-word, the memory parameter, and the number of initial code-words respectively. The adjusted parameters are , , and for Sounds of the Elements; , , and for Speech; , , for Western Music and , , and for non-Western Music. All model's curves were computed by averaging 50 realizations with identical parameters.