Pergen names: Difference between revisions
Wikispaces>TallKite **Imported revision 621999693 - Original comment: ** |
Wikispaces>TallKite **Imported revision 622022613 - Original comment: ** |
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<h2>IMPORTED REVISION FROM WIKISPACES</h2> | <h2>IMPORTED REVISION FROM WIKISPACES</h2> | ||
This is an imported revision from Wikispaces. The revision metadata is included below for reference:<br> | This is an imported revision from Wikispaces. The revision metadata is included below for reference:<br> | ||
: This revision was by author [[User:TallKite|TallKite]] and made on <tt>2017-11-20 | : This revision was by author [[User:TallKite|TallKite]] and made on <tt>2017-11-20 09:53:37 UTC</tt>.<br> | ||
: The original revision id was <tt> | : The original revision id was <tt>622022613</tt>.<br> | ||
: The revision comment was: <tt></tt><br> | : The revision comment was: <tt></tt><br> | ||
The revision contents are below, presented both in the original Wikispaces Wikitext format, and in HTML exactly as Wikispaces rendered it.<br> | The revision contents are below, presented both in the original Wikispaces Wikitext format, and in HTML exactly as Wikispaces rendered it.<br> | ||
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Analogous to 22-edo, sometimes additional accidentals aren't needed, but are desirable, to avoid misspelled chords. For example, schismic is fifth-based and can be notated conventionally. But this causes 4:5:6 to be spelled as C Fb G. With ^1 = 81/80, the chord can be spelled C Ev G. | Analogous to 22-edo, sometimes additional accidentals aren't needed, but are desirable, to avoid misspelled chords. For example, schismic is fifth-based and can be notated conventionally. But this causes 4:5:6 to be spelled as C Fb G. With ^1 = 81/80, the chord can be spelled C Ev G. | ||
Not all possible combinations of periods and generators are unique pergens | Not all possible combinations of periods and generators are unique pergens. {P8/2, P5/2} is actually {P8/2, P4/2}. There is no {P8, M2/2}, and {P8/2, M2/2} is actually {P8/2, P5}. | ||
This table lists all unique rank-2 pergens, assuming primes 2 and 3, grouped by the size of the larger splitting factor. | This table lists all unique rank-2 pergens, assuming primes 2 and 3, grouped by the size of the larger splitting factor. | ||
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The genchain shown is a short section of the full genchain. C - G implies ...Eb Bb F C G D A E B F# C#... And C - Eb^=Ev - G implies ...F - Ab^=Av - C - Eb^=Ev - G - Bb^=Bv - D - F^=F#v - A - C^=C#v - E... If the octave is split, the genchain shows the octave: In C - F#v=Gb^ - C, the last C is an octave above the first one. | The genchain shown is a short section of the full genchain. C - G implies ...Eb Bb F C G D A E B F# C#... And C - Eb^=Ev - G implies ...F - Ab^=Av - C - Eb^=Ev - G - Bb^=Bv - D - F^=F#v - A - C^=C#v - E... If the octave is split, the genchain shows the octave: In C - F#v=Gb^ - C, the last C is an octave above the first one. | ||
An edo is incompatible with a pergen if the split is impossible. For example, all odd-numbered edos are incompatible with half-octave pergens. An edo is somewhat incompatible with a pergen if the period and generator can only generate a subset of the edo. For example, 15-edo is somewhat incompatible with {P8, P5}, because any chain-of-5ths scale | An edo is incompatible with a pergen if the split is impossible. For example, all odd-numbered edos are incompatible with half-octave pergens. An edo is somewhat incompatible with a pergen if the period and generator can only generate a subset of the edo. For example, 15-edo is somewhat incompatible with {P8, P5}, because any chain-of-5ths scale could only make a 5-edo subset. Such edos are marked with asterisks. 13b is incompatible with {P8, P5/2}, but 13 isn't. However, 13 is incompatible with heptatonic notation. | ||
(table is under construction) | (table is under construction) | ||
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/1 = j1 = 33/32 ||= " || | /1 = j1 = 33/32 ||= " || | ||
||~ thirds ||~ ||~ ||~ ||~ ||~ ||~ || | ||~ thirds ||~ ||~ ||~ ||~ ||~ ||~ || | ||
||= {P8/3, P5} ||= ||= | ||= {P8/3, P5} ||= ||= P8/3 = vM3 = ^^d4 | ||
(^/v may reverse) ||= ^<span style="vertical-align: super;">3</span>d2 ||= <span style="font-family: Arial,Helvetica,sans-serif;">C - Ev - Ab^ - C</span> ||= ||= 12, 15, 18b*, 21, 24*, | |||
27, 30* || | 27, 30* || | ||
||= {P8, P4/3} ||= ||= | ||= {P8, P4/3} ||= ||= P4/3 = ^^m2 = vM2 ||= v<span style="vertical-align: super;">3</span>A1 ||= C - Dv - Eb^ - F ||= ||= 13b, 14*, 15, 21*, | ||
22, 28*, 29, 30* || | 22, 28*, 29, 30* || | ||
||= {P8, P5/3} ||= ||= | ||= {P8, P5/3} ||= ||= P5/3 = ^M2 = vvm3 ||= v<span style="vertical-align: super;">3</span>m2 ||= C - D^ - Fv - G ||= ||= 15*, 16, 20*, 21, | ||
25*, 26, 30*, 31 || | 25*, 26, 30*, 31 || | ||
||= {P8, P11/3} ||= ||= | ||= {P8, P11/3} ||= ||= P11/3 = vA4 = ^^dd5 ||= ^<span style="vertical-align: super;">3</span>dd2 ||= C - F#v - Cb^ - F ||= ||= same as {P8, P4/3} || | ||
||= " ||= ||= P11/3 = ^P4 = vvP5 ||= v<span style="vertical-align: super;">3</span>M2 ||= C F^ Cv F ||= ||= || | |||
||= {P8/3, P4/2} ||= ||= ||= ||= ||= ||= 15, 18b*, 24, 30 || | ||= {P8/3, P4/2} ||= ||= ||= ||= ||= ||= 15, 18b*, 24, 30 || | ||
||= {P8/3, P5/2} ||= ||= ||= ||= ||= ||= 18b, 24, 30 || | ||= {P8/3, P5/2} ||= ||= ||= ||= ||= ||= 18b, 24, 30 || | ||
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||= {P8/3, P4/3} ||= ||= ||= ||= ||= ||= 15, 21, 30* || | ||= {P8/3, P4/3} ||= ||= ||= ||= ||= ||= 15, 21, 30* || | ||
||~ quarters ||~ ||~ ||~ ||~ ||~ ||~ || | ||~ quarters ||~ ||~ ||~ ||~ ||~ ||~ || | ||
||= {P8/4, P5} ||= ||= | ||= {P8/4, P5} ||= ||= P8/4 = vm3 = ^<span style="vertical-align: super;">3</span>d2 | ||
||= {P8, P4/4} ||= ||= | (^/v may reverse) ||= v<span style="vertical-align: super;">4</span>d2 ||= C Ebv Gbbvv A^ C ||= ||= 12, 16, 20, 24*, 28 || | ||
||= {P8, P5/4} ||= ||= | ||= {P8, P4/4} ||= ||= P4/4 = ^m2 = v<span style="vertical-align: super;">3</span>AA1 ||= ^<span style="vertical-align: super;">4</span>dd2 ||= C Db^ Ebb^^ Ev F ||= ||= || | ||
||= {P8, P5/4} ||= ||= P5/4 = vM2 = ^<span style="vertical-align: super;">3</span>m2 ||= v<span style="vertical-align: super;">4</span>A1 || C Dv Evv F^ G^ ||= ||= || | |||
||= {P8, P11/4} ||= ||= ||= ||= ||= ||= || | ||= {P8, P11/4} ||= ||= ||= ||= ||= ||= || | ||
||= {P8, P12/4} ||= ||= ||= ||= ||= ||= || | ||= {P8, P12/4} ||= ||= ||= ||= ||= ||= || | ||
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||= {P8/2, P5/4} ||= ||= ||= ||= ||= ||= || | ||= {P8/2, P5/4} ||= ||= ||= ||= ||= ||= || | ||
||= ||= ||= ||= ||= ||= ||= || | ||= ||= ||= ||= ||= ||= ||= || | ||
||= | ||= etc. ||= ||= ||= ||= ||= ||= || | ||
||= ||= ||= ||= ||= ||= ||= || | ||= ||= ||= ||= ||= ||= ||= || | ||
||= ||= ||= ||= ||= ||= ||= || | ||= ||= ||= ||= ||= ||= ||= || | ||
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Analogous to 22-edo, sometimes additional accidentals aren't needed, but are desirable, to avoid misspelled chords. For example, schismic is fifth-based and can be notated conventionally. But this causes 4:5:6 to be spelled as C Fb G. With ^1 = 81/80, the chord can be spelled C Ev G.<br /> | Analogous to 22-edo, sometimes additional accidentals aren't needed, but are desirable, to avoid misspelled chords. For example, schismic is fifth-based and can be notated conventionally. But this causes 4:5:6 to be spelled as C Fb G. With ^1 = 81/80, the chord can be spelled C Ev G.<br /> | ||
<br /> | <br /> | ||
Not all possible combinations of periods and generators are unique pergens | Not all possible combinations of periods and generators are unique pergens. {P8/2, P5/2} is actually {P8/2, P4/2}. There is no {P8, M2/2}, and {P8/2, M2/2} is actually {P8/2, P5}. <br /> | ||
<br /> | <br /> | ||
This table lists all unique rank-2 pergens, assuming primes 2 and 3, grouped by the size of the larger splitting factor.<br /> | This table lists all unique rank-2 pergens, assuming primes 2 and 3, grouped by the size of the larger splitting factor.<br /> | ||
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The genchain shown is a short section of the full genchain. C - G implies ...Eb Bb F C G D A E B F# C#... And C - Eb^=Ev - G implies ...F - Ab^=Av - C - Eb^=Ev - G - Bb^=Bv - D - F^=F#v - A - C^=C#v - E... If the octave is split, the genchain shows the octave: In C - F#v=Gb^ - C, the last C is an octave above the first one.<br /> | The genchain shown is a short section of the full genchain. C - G implies ...Eb Bb F C G D A E B F# C#... And C - Eb^=Ev - G implies ...F - Ab^=Av - C - Eb^=Ev - G - Bb^=Bv - D - F^=F#v - A - C^=C#v - E... If the octave is split, the genchain shows the octave: In C - F#v=Gb^ - C, the last C is an octave above the first one.<br /> | ||
<br /> | <br /> | ||
An edo is incompatible with a pergen if the split is impossible. For example, all odd-numbered edos are incompatible with half-octave pergens. An edo is somewhat incompatible with a pergen if the period and generator can only generate a subset of the edo. For example, 15-edo is somewhat incompatible with {P8, P5}, because any chain-of-5ths scale | An edo is incompatible with a pergen if the split is impossible. For example, all odd-numbered edos are incompatible with half-octave pergens. An edo is somewhat incompatible with a pergen if the period and generator can only generate a subset of the edo. For example, 15-edo is somewhat incompatible with {P8, P5}, because any chain-of-5ths scale could only make a 5-edo subset. Such edos are marked with asterisks. 13b is incompatible with {P8, P5/2}, but 13 isn't. However, 13 is incompatible with heptatonic notation.<br /> | ||
<br /> | <br /> | ||
(table is under construction)<br /> | (table is under construction)<br /> | ||
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<td style="text-align: center;"><br /> | <td style="text-align: center;"><br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;">P8/3 = vM3 = ^^d4<br /> | ||
(^/v may reverse)<br /> | |||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;">^<span style="vertical-align: super;">3</span>d2<br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;"><span style="font-family: Arial,Helvetica,sans-serif;">C - Ev - Ab^ - C</span><br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;"><br /> | ||
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<td style="text-align: center;"><br /> | <td style="text-align: center;"><br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;">P4/3 = ^^m2 = vM2<br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;">v<span style="vertical-align: super;">3</span>A1<br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;">C - Dv - Eb^ - F<br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;"><br /> | ||
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<td style="text-align: center;"><br /> | <td style="text-align: center;"><br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;">P5/3 = ^M2 = vvm3<br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;">v<span style="vertical-align: super;">3</span>m2<br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;">C - D^ - Fv - G<br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;"><br /> | ||
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</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;"><br /> | ||
</td> | |||
<td style="text-align: center;">P11/3 = vA4 = ^^dd5<br /> | |||
</td> | |||
<td style="text-align: center;">^<span style="vertical-align: super;">3</span>dd2<br /> | |||
</td> | |||
<td style="text-align: center;">C - F#v - Cb^ - F<br /> | |||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;"><br /> | ||
</td> | |||
<td style="text-align: center;">same as {P8, P4/3}<br /> | |||
</td> | |||
</tr> | |||
<tr> | |||
<td style="text-align: center;">&quot;<br /> | |||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;"><br /> | ||
</td> | |||
<td style="text-align: center;">P11/3 = ^P4 = vvP5<br /> | |||
</td> | |||
<td style="text-align: center;">v<span style="vertical-align: super;">3</span>M2<br /> | |||
</td> | |||
<td style="text-align: center;">C F^ Cv F<br /> | |||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;"><br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;"><br /> | ||
</td> | </td> | ||
</tr> | </tr> | ||
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<td style="text-align: center;"><br /> | <td style="text-align: center;"><br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;">P8/4 = vm3 = ^<span style="vertical-align: super;">3</span>d2<br /> | ||
(^/v may reverse)<br /> | |||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;">v<span style="vertical-align: super;">4</span>d2<br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;">C Ebv Gbbvv A^ C<br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;"><br /> | ||
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<td style="text-align: center;"><br /> | <td style="text-align: center;"><br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;">P4/4 = ^m2 = v<span style="vertical-align: super;">3</span>AA1<br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;">^<span style="vertical-align: super;">4</span>dd2<br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;">C Db^ Ebb^^ Ev F<br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;"><br /> | ||
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<td style="text-align: center;"><br /> | <td style="text-align: center;"><br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;">P5/4 = vM2 = ^<span style="vertical-align: super;">3</span>m2<br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;">v<span style="vertical-align: super;">4</span>A1<br /> | ||
</td> | </td> | ||
<td | <td>C Dv Evv F^ G^<br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;"><br /> | ||
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</tr> | </tr> | ||
<tr> | <tr> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;">etc.<br /> | ||
</td> | </td> | ||
<td style="text-align: center;"><br /> | <td style="text-align: center;"><br /> |