Pitch ranking and melody contour identification [4] showed that there was an improvement with semitone mapping over Std mapping.
VCs on an array of 22 electrodes would yield a total number of 43 channels, which would allow covering three and a half octaves with semitone (Smt) mapping with one-semitone intervals between the characteristic frequencies of successive channels.
To investigate whether music with semitone mapping would be perceived as musical, a music IR test was carried out.
However, in general there was a decrease in average individual instrument and instrument family recognition scores with semitone mappings.
As harmonic signals are organized in a chromatic scale and using this scale, the musical notes are defined with semitone resolution, the developed method uses a 1/4 semitone resolution.
Two octaves (3 and 4) were tested with semitone intervals from 1 to 3. Chance level is indicated by the dashed line.
The instrument recognition test showed a significant enhancement with Clarinet using Smt-MF but in general revealed a significant decrease in average scores with semitone mapping.
Although the mode was 100% correct in each case (with semitone errors counted as correct), for each timbre the vast majority of participants made some errors.
Apply improvements with perseverance.
