Tour of regular temperaments: Difference between revisions
→Tricot or Quadsatriyo family (P8, P12/3): corrected the pergen to P11/3, replaced 13-limit ratios with 5-limit ones (since the defining comma is 5-limit), linked to relevant 7-limit and 13-limit clans, added 5/4's mapping. |
→Families defined by a 2.3.5 (ya) comma: -laconic -comic +ripple |
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===[[Porcupine family|Porcupine or Triyo family]] (P8, P4/3)=== | ===[[Porcupine family|Porcupine or Triyo family]] (P8, P4/3)=== | ||
The porcupine family tempers out {{Monzo|1 -5 3}} = [[250/243]], the difference between three 10/9's (1000/729) and 4/3, known as the maximal diesis or porcupine comma. It subdivides the fourth into three equal parts, each taken as an approximated 10/9, of which two approximate 6/5. It also manifests itself as the difference between three 6/5's and 16/9, as the difference between 10/9 and 27/25, and as the difference between 81/80 and 25/24. 5/4 is equated to 1 octave minus 5 generators. Some porcupine temperaments include [[15edo]], [[22edo]], [[37edo]], and [[59edo]]. An important 7-limit extension also tempers out 64/63. | The porcupine family tempers out {{Monzo|1 -5 3}} = [[250/243]], the difference between three 10/9's (1000/729) and 4/3, known as the maximal diesis or porcupine comma. It subdivides the fourth into three equal parts, each taken as an approximated 10/9, of which two approximate 6/5. It also manifests itself as the difference between three 6/5's and 16/9, as the difference between 10/9 and 27/25, and as the difference between 81/80 and 25/24. 5/4 is equated to 1 octave minus 5 generators. Some porcupine temperaments include [[15edo]], [[22edo]], [[37edo]], and [[59edo]]. An important 7-limit extension also tempers out 64/63. | ||
===[[Tricot family|Tricot or Quadsatriyo family]] (P8, P11/3)=== | ===[[Tricot family|Tricot or Quadsatriyo family]] (P8, P11/3)=== | ||
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===[[Vulture family|Vulture or Sasa-quadyo family]] (P8, P12/4)=== | ===[[Vulture family|Vulture or Sasa-quadyo family]] (P8, P12/4)=== | ||
This tempers out the [[vulture comma]], {{Monzo|24 -21 4}}. Its generator is ~320/243 = ~475¢, four of which make ~3/1. 5/4 is equated to 21 generators minus 8 octaves. An obvious 7-limit interpretation of the generator is 21/16, which makes Saquadru. | This tempers out the [[vulture comma]], {{Monzo|24 -21 4}}. Its generator is ~320/243 = ~475¢, four of which make ~3/1. 5/4 is equated to 21 generators minus 8 octaves. An obvious 7-limit interpretation of the generator is 21/16, which makes Saquadru. | ||
===[[Pental family|Pental or Trila-quingu family]] (P8/5, P5)=== | ===[[Pental family|Pental or Trila-quingu family]] (P8/5, P5)=== | ||
This tempers out the pental comma, 847288609443/838860800000 = {{Monzo|-28 25 -5}}. The period is 59049/51200, and 5 periods make an octave. The generator is a 5th, or equivalently, 3/5 of an 8ve minus a 5th. This alternate generator is only about 18¢, thus the scales have a very lopsided L/s ratio. 5/4 is equated to 2/5 of an octave minus 5 of these 18¢ generators. An obvious 7-limit interpretation of the generator is 8/7, which leads to Laquinzo. | This tempers out the pental comma, 847288609443/838860800000 = {{Monzo|-28 25 -5}}. The period is 59049/51200, and 5 periods make an octave. The generator is a 5th, or equivalently, 3/5 of an 8ve minus a 5th. This alternate generator is only about 18¢, thus the scales have a very lopsided L/s ratio. 5/4 is equated to 2/5 of an octave minus 5 of these 18¢ generators. An obvious 7-limit interpretation of the generator is 8/7, which leads to Laquinzo. | ||
===[[Ripple family|Ripple or Quingu family]] (P8, P4/5)=== | |||
This tempers out the ripple comma, 6561/6250 = {{Monzo| -1 8 -5 }}, which equates a stack of four [[10/9]]'s with [[8/5]]. As one might expect, [[12edo]] is about as accurate as it can be. | |||
===[[Amity family|Amity or Saquinyo family]] (P8, P11/5)=== | ===[[Amity family|Amity or Saquinyo family]] (P8, P11/5)=== |