Pentatonic Functional Just System: Difference between revisions

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| [[10/7]] || 617.5 || 5s457

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A lot of interesting things show up here. First of all, we finally have just representations for "[[neutral]]" intervals, which are between the minor and major intervals in their category. Here, [[15/13]], which is beteeen [[8/7]] and [[7/6]], can be considered a neutral 5second (especially if [[676/675]] is tempered out), [[13/10]] a semi-sub 5third, [[20/13]] a semi-super 5fourth, and [[26/15]] a neutral 5fifth. Intervals which are neutral here are considered [[interseptimal]] by diatonic classification, as they fall right between two diatonic interval categories.

Now, there are intervals between the pentatonic categories, such as [[11/9]] and [[12/11]]. The edges of each interval category can be considered the 5-limit intervals (such as [[16/15]], [[10/9]], [[6/5]], and [[5/4]]), thus the regions between interval categories can be termed "interpental" (not to be confused with [[Interpental|the temperament of the same name]], which is in fact generated by an interpental interval). The neutral intervals of diatonic are interpental intervals in pentatonic, such as 12/11 being between 16/15 and 10/9, and 11/9 being between 6/5 and 5/4. One may realize that 11/8 and 16/11 are classified rather out of place, with 11/8 being a 5subfourth and 16/11 being a 5superthird. The PFJS is not perfect, and this system was designed to keep 13/11 and 15/13 in the right category, thus 11/8 must be messed up (though other intervals of 11 are interpental, so are fine). However, 11/8 is in the region between 4/3 and 3/2, where there can be considered to be ''two'' interpental regions; one between [[27/20]] and [[45/32]], and another between [[64/45]] and [[40/27]]. These are the [[superfourth]] and [[subfifth]] regions in diatonic, which can also be considered neutral regions. In pentatonic, since these regions are interpental, they are ambiguously between 5thirds and 5fourths, justifying the otherwise out-of-place classification of 11/8. However, one may not be fond of the fact that [[7/5]] and [[10/7]] are just barely in these ranges; thus, one may prefer to make them narrower (~40 cents wide).

@@ Line 358: / Line 358: @@
 | [[10/7]] || 617.5 || <sub>5</sub>s4<sup>5</sup><sub>7</sub>
 |}
+</div></div>
+A lot of interesting things show up here. First of all, we finally have just representations for "[[neutral]]" intervals, which are between the minor and major intervals in their category. Here, [[15/13]], which is beteeen [[8/7]] and [[7/6]], can be considered a neutral <sub>5</sub>second (especially if [[676/675]] is tempered out), [[13/10]] a semi-sub <sub>5</sub>third, [[20/13]] a semi-super <sub>5</sub>fourth, and [[26/15]] a neutral <sub>5</sub>fifth. Intervals which are neutral here are considered [[interseptimal]] by diatonic classification, as they fall right between two diatonic interval categories.
+Now, there are intervals between the pentatonic categories, such as [[11/9]] and [[12/11]]. The edges of each interval category can be considered the 5-limit intervals (such as [[16/15]], [[10/9]], [[6/5]], and [[5/4]]), thus the regions between interval categories can be termed "interpental" (not to be confused with [[Interpental|the temperament of the same name]], which is in fact generated by an interpental interval). The neutral intervals of diatonic are interpental intervals in pentatonic, such as 12/11 being between 16/15 and 10/9, and 11/9 being between 6/5 and 5/4. One may realize that 11/8 and 16/11 are classified rather out of place, with 11/8 being a <sub>5</sub>subfourth and 16/11 being a <sub>5</sub>superthird. The PFJS is not perfect, and this system was designed to keep 13/11 and 15/13 in the right category, thus 11/8 must be messed up (though other intervals of 11 are interpental, so are fine). However, 11/8 is in the region between 4/3 and 3/2, where there can be considered to be ''two'' interpental regions; one between [[27/20]] and [[45/32]], and another between [[64/45]] and [[40/27]]. These are the [[superfourth]] and [[subfifth]] regions in diatonic, which can also be considered neutral regions. In pentatonic, since these regions are interpental, they are ambiguously between <sub>5</sub>thirds and <sub>5</sub>fourths, justifying the otherwise out-of-place classification of 11/8. However, one may not be fond of the fact that [[7/5]] and [[10/7]] are just barely in these ranges; thus, one may prefer to make them narrower (~40 cents wide).