SeventeenTheory: Difference between revisions

(3 intermediate revisions by 2 users not shown)

Line 1:

~~<span style~~=~~"display: block; text-align: right;">~~[[~~17音理論~~|~~日本語]]</span>~~

{{interwiki

| de =

17-tone equal tuning has fifths very close to just-intonation (and 12-equal) fifths. Consequently we use the usual circle-of-fifths on a five-line-staff notation, with a twist of new enharmonic equivalents, caused by the accumulation of the difference in the size of the fifth. To figure out the enharmonic names of any closed circle of fifths, write out a portion of it, like:

| en = SeventeenTheory

| es =

| ja = 17音理論

}}

[[17edo|17-tone equal tuning]] has fifths very close to [[just intonation|just-intonation]] (and [[12edo|12-equal]]) fifths. Consequently we use the usual [[Circle of fifths|circle-of-fifths]] on a five-line-staff [[notation]], with a twist of new [[enharmonic]] equivalents, caused by the accumulation of the difference in the size of the fifth. To figure out the enharmonic names of any closed circle of fifths, write out a portion of it, like:

Cb Gb Db Ab Eb Bb F C G D A E B F# C# G# D# A# E#

Line 9:

Line 13:

[[File:17fifths-withext.jpg|alt=17fifths|17fifths]]

The lines across indicate five fourths = "minor second" = 1/17 of an octave. (We know this because 17's perfect fourth is 7/17 of an octave, and 7*5 modulo 17 = 1.)

The lines across indicate five fourths = "minor second" = 1/17 of an octave. (We know this because 17's perfect fourth is 7/17 of an [[octave]], and 7*5 modulo 17 = 1.)

So if we re-wrap the circle according to these lines, we should get the 17 notes of the scale in ascending/descending order (I moved A to the top just because):

Line 15:

Line 19:

[[File:17versus12names-withext.jpg|alt=17versus12names|17versus12names]]

Note that C# is HIGHER than Db; note that none of the intervals save the octave/unison are exactly the same as in 12. Note that The "half step"/"minor second" in 17 is twice as small as the "augmented unison"/"sharp"/"flat." Two sharp/flats add up to a minor third. Two "neutral thirds" add up to a "perfect fifth." 17 shares this last property with the quartertone scale (24-EDO).

Note that C# is HIGHER than Db; note that none of the intervals save the octave/unison are exactly the same as in 12. Note that The "half step"/"minor second" in 17 is twice as small as the "augmented unison"/"sharp"/"flat." Two sharp/flats add up to a minor third. Two "neutral thirds" add up to a "perfect fifth." 17 shares this last property with the quartertone scale ([[24-EDO]]).

If the old notation is bothering you, here it is in cents (hundredths of a 12-equal half step):

If the old notation is bothering you, here it is in [[cents]] (hundredths of a 12-equal half step):

[[File:17versus12cents-withext.jpg|alt=17versus12cents|17versus12cents]]

Line 24:

Line 28:

[[File:17versus12pcs-withext.jpg|alt=17versus12pcs|17versus12pcs]]

[[Category:17edo]]

[[Category:EDO theory pages]]

@@ Line 1: / Line 1: @@
-<span style="display: block; text-align: right;">[[17音理論|日本語]]</span>
+{{interwiki
+| de =
--tone equal tuning has fifths very close to just-intonation (and 12-equal) fifths. Consequently we use the usual circle-of-fifths on a five-line-staff notation, with a twist of new enharmonic equivalents, caused by the accumulation of the difference in the size of the fifth. To figure out the enharmonic names of any closed circle of fifths, write out a portion of it, like:
+| en = SeventeenTheory
+| es =
+| ja = 17音理論
+}}
+[[17edo|17-tone equal tuning]] has fifths very close to [[just intonation|just-intonation]] (and [[12edo|12-equal]]) fifths. Consequently we use the usual [[Circle of fifths|circle-of-fifths]] on a five-line-staff [[notation]], with a twist of new [[enharmonic]] equivalents, caused by the accumulation of the difference in the size of the fifth. To figure out the enharmonic names of any closed circle of fifths, write out a portion of it, like:
 Cb Gb Db Ab Eb Bb F C G D A E B F# C# G# D# A# E#
@@ Line 9: / Line 13: @@
 [[File:17fifths-withext.jpg|alt=17fifths|17fifths]]
-The lines across indicate five fourths = "minor second" = 1/17 of an octave. (We know this because 17's perfect fourth is 7/17 of an octave, and 7*5 modulo 17 = 1.)
+The lines across indicate five fourths = "minor second" = 1/17 of an octave. (We know this because 17's perfect fourth is 7/17 of an [[octave]], and 7*5 modulo 17 = 1.)
 So if we re-wrap the circle according to these lines, we should get the 17 notes of the scale in ascending/descending order (I moved A to the top just because):
@@ Line 15: / Line 19: @@
 [[File:17versus12names-withext.jpg|alt=17versus12names|17versus12names]]
-Note that C# is HIGHER than Db; note that none of the intervals save the octave/unison are exactly the same as in 12. Note that The "half step"/"minor second" in 17 is twice as small as the "augmented unison"/"sharp"/"flat." Two sharp/flats add up to a minor third. Two "neutral thirds" add up to a "perfect fifth." 17 shares this last property with the quartertone scale (24-EDO).
+Note that C# is HIGHER than Db; note that none of the intervals save the octave/unison are exactly the same as in 12. Note that The "half step"/"minor second" in 17 is twice as small as the "augmented unison"/"sharp"/"flat." Two sharp/flats add up to a minor third. Two "neutral thirds" add up to a "perfect fifth." 17 shares this last property with the quartertone scale ([[24-EDO]]).
-If the old notation is bothering you, here it is in cents (hundredths of a 12-equal half step):
+If the old notation is bothering you, here it is in [[cents]] (hundredths of a 12-equal half step):
 [[File:17versus12cents-withext.jpg|alt=17versus12cents|17versus12cents]]
@@ Line 24: / Line 28: @@
 [[File:17versus12pcs-withext.jpg|alt=17versus12pcs|17versus12pcs]]
+[[Category:17edo]]
+[[Category:EDO theory pages]]