Phases of the experiment
Current available experimental data, obtained by studies of other scientists in the past, are at the sound frequency precision of a single keyboard key (a semi-tone). Here is how that looks metaphorically on the piano keyboard (each sound is metaphorically represented by a red rectangle):
Our experiment aims to collect data with higher frequency resolution and wider frequency span. The limit of human hearing has a frequency resolution of around 30 sounds per keyboard key. However, the number of listening comparisons to achieve such a resolution seems way beyond what we could achieve (dozens of millions!). For that reason, we decided to split the experiment in phases, where at each phase we will increase the frequency resolution or the octave span a bit more than the previous phase (double than the previous). Therefore, in case we won't make it to the last phase, any phase beyond the first one will bring us a benefit of an increased data precision, in comparison to the currently available data. That is how we got the following 12 phases:
(Higher phases will aim for such a high frequency resolution, that is not possible to be presented clearly on the picture, so we simply continue with text.)
PHASE 9 Frequency resolution: 16 sound per keyboard key Frequency span: 1 octave
PHASE 10 Frequency resolution: 16 sound per keyboard key Frequency span: 2 octave s
PHASE 11 Frequency resolution: 32 sound per keyboard key Frequency span: 1 octave
PHASE 12 Frequency resolution: 32 sound per keyboard key Frequency span: 2 octave s
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