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Ripple family: Difference between revisions

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== Ripple ==
== Ripple ==
The generator of ripple is a semitone representing 27/25, five of which give 4/3, and eight of which give 8/5. This means that 27/25 is severely flattened, so that the characteristic damage is a strongly flat-tempered [[4/3|fourth]] reached at 5 semitones. Interestingly, in optimal tunings, the major third of ~5/4 does not tend to be damaged much sharpwards as one might expect from the equivalence, and is in practice often even flat, so that prime 3 takes on practically the whole damage of the 5-limit equivalence, for which it has the advantage of being the simplest so still having a good chance at psychoacoustic viability. As a result though, the mapping of ~9/8 is often inconsistent, so that ripple can in practice be thought of as a [[dual-fifth temperament]] unless you use tunings close to [[12edo]].
The generator of ripple is a semitone representing 27/25, five of which give 4/3, and eight of which give 8/5. The ploidacot of ripple is omega-pentacot. This means that 27/25 is severely flattened, so that the characteristic damage is a strongly flat-tempered fourth reached at 5 semitones. Interestingly, in optimal tunings, the major third of ~5/4 does not tend to be damaged much sharpwards as one might expect from the equivalence, and is in practice sometimes even flat, so that prime 3 takes on practically the whole damage of the 5-limit equivalence, for which it has the advantage of being the simplest so still having a good chance at psychoacoustic viability. As a result though, the mapping of ~9/8 is often very flat, so that ripple can in practice be thought of as a [[dual-fifth temperament]] unless you use tunings close to [[12edo]].


Reasonable [[patent val]] tunings not appearing in the optimal ET sequence are [[35edo]] and [[47edo]].
Reasonable [[patent val]] tunings not appearing in the optimal ET sequence are [[35edo]] and [[47edo]].
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[[Optimal tuning]]s:  
[[Optimal tuning]]s:  
* [[CTE]]: ~2 = 1200.000, ~27/25 = 100.752
* [[WE]]: ~2 = 1200.2636{{c}}, ~27/25 = 100.8602{{c}}
: [[error map]]: {{val| 0.000 -5.717 +7.668 }}
: [[error map]]: {{val| +0.264 -5.729 +7.596 }}
* [[CWE]]: ~2 = 1200.000, ~27/25 = 100.798
* [[CWE]]: ~2 = 1200.0000{{c}}, ~27/25 = 100.7982{{c}}
: [[error map]]: {{val| 0.000 -5.946 +7.300 }}
: [[error map]]: {{val| 0.000 -5.946 +7.300 }}
* [[POTE]]: ~2 = 1200.000, ~27/25 = 100.838
<!-- * [[CTE]]: ~2 = 1200.000{{c}}, ~27/25 = 100.752{{c}}
: error map: {{val| 0.000 -6.145 +6.982 }}
: error map: {{val| 0.000 -5.717 +7.668 }}
* [[POTE]]: ~2 = 1200.000{{c}}, ~27/25 = 100.838{{c}}
: error map: {{val| 0.000 -6.145 +6.982 }} -->


[[Tuning ranges]]:  
[[Tuning ranges]]:  
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{{Optimal ET sequence|legend=1| 11c, 12, 71b, 83b }}
{{Optimal ET sequence|legend=1| 11c, 12, 71b, 83b }}


[[Badness]]:
[[Badness]] (Sintel): 3.26
* Smith 0.139
* Dirichlet: 3.26


== Septimal ripple ==
== Septimal ripple ==
{{See also| Dual-fifth temperaments }}
{{See also| Dual-fifth temperaments }}
Septimal ripple interprets the generator as a very flat ~15/14, so that 3 and 5 are flat and 7 is sharp; of these, 3 is the most damaged, but is also the simplest, so is still viable as an approximation. Due to the sharp 7 and flatter 3, ~21/16 can be fairly in-tune, acting as the alternate fourth in a dual-fourth interpretation, so that the inconsistent but more accurate ~16/9 is reached as ~(21/16)⋅(4/3) = ~7/4, though this assumes you are putting the most damage on 3 as to get larger primes more in tune. This has another advantage, specific to the 11-limit: this accurate but inconsistent ~9/8 (which is usually just to slightly sharp) can find the neutral third ~11/9 with reasonable accuracy.
Septimal ripple interprets the generator as a very flat ~15/14, so that 3 and 5 are flat and 7 is sharp; of these, 3 is the most damaged, but is also the simplest, so is still viable as an approximation. Due to the sharp 7 and flatter 3, ~21/16 can be fairly in-tune, acting as the alternate fourth in a dual-fourth interpretation, so that the inconsistent but more accurate ~16/9 is reached as ~(21/16)⋅(4/3) = ~7/4, though this assumes you are putting the most damage on 3 as to get larger primes more in tune. This has another advantage, specific to the 11-limit: this accurate but inconsistent ~9/8 (which is usually just to slightly sharp) can find the neutral third ~11/9 with reasonable accuracy.


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{{Mapping|legend=1| 1 2 3 4 | 0 -5 -8 -14 }}
{{Mapping|legend=1| 1 2 3 4 | 0 -5 -8 -14 }}


[[Optimal tuning]]s:
[[Optimal tuning]]s:  
* [[CTE]]: ~2 = 1200.000, ~15/14 = 101.538
* [[WE]]: ~2 = 1201.7546{{c}}, ~15/14 = 102.1309{{c}}
: [[error map]]: {{val| 0 -9.643 +1.385 +9.647 }}
: error map: {{val| +1.755 -9.100 +1.903 +8.360 }}
* [[CWE]]: ~2 = 1200.000, ~15/14 = 101.777
* [[CWE]]: ~2 = 1200.0000{{c}}, ~15/14 = 101.7772{{c}}
: error map: {{val| 0 -10.841 -0.531 +6.294 }}
: error map: {{val| 0.000 -10.841 -0.531 +6.294 }}
* [[CEE]]: ~2 = 1200.000, ~15/14 = 101.881
<!-- * [[CTE]]: ~2 = 1200.000{{c}}, ~15/14 = 101.538{{c}}
: error map: {{val| 0 -11.361 -1.364 +4.837 }}
: error map: {{val| 0.000 -9.643 +1.385 +9.647 }}
* [[CEE]]: ~2 = 1200.000{{c}}, ~15/14 = 101.881{{c}}
: error map: {{val| 0.000 -11.361 -1.364 +4.837 }} -->


{{Optimal ET sequence|legend=1| 11cd, 12, 35, 47 }}
{{Optimal ET sequence|legend=1| 11cd, 12, 35, 47 }}


[[Badness]]:
[[Badness]] (Sintel): 1.52
* Smith: 0.0601
* Dirichlet: 1.52


=== 11-limit ===
=== 11-limit ===
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Optimal tunings:
Optimal tunings:
* CTE: ~2 = 1200.000, ~15/14 = 101.538
* WE: ~2 = 1202.5973{{c}}, ~15/14 = 102.7900{{c}}
: error map: {{val| 0 -11.785 -2.041 +3.651 +13.296 }}
: error map: {{val| +2.597 -10.710 -0.842 +2.504 +11.449 }}
* CWE: ~2 = 1200.000, ~15/14 = 102.297
* CWE: ~2 = 1200.0000{{c}}, ~15/14 = 102.2972{{c}}
: error map: {{val| 0 -13.441 -4.691 -0.986 +7.333 }}
: error map: {{val| 0.000 -13.441 -4.691 -0.986 +7.333 }}
* CEE: ~2 = 1200.000, ~15/14 = 102.319
<!-- * CTE: ~2 = 1200.0000{{c}}, ~15/14 = 101.538{{c}}
: error map: {{val| 0 -13.551 -4.868 -1.296 +6.935 }}
: error map: {{val| 0.000 -11.785 -2.041 +3.651 +13.296 }}
* CEE: ~2 = 1200.000{{c}}, ~15/14 = 102.319{{c}}
: error map: {{val| 0.000 -13.551 -4.868 -1.296 +6.935 }} -->


{{Optimal ET sequence|legend=0| 11cdee, 12, 23de, 35 }}
{{Optimal ET sequence|legend=0| 11cdee, 12, 23de, 35 }}


Badness:
Badness (Sintel): 1.33
* Smith: 0.0403
* Dirichlet: 1.33


== Rip ==
== Rip ==
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[[Optimal tuning]]s:  
[[Optimal tuning]]s:  
* [[CTE]]: ~2 = 1200.000, ~21/20 = 101.089
* [[WE]]: ~2 = 1195.0347{{c}}, ~21/20 = 99.0710{{c}}
: [[error map]]: {{val| 0.000 -7.402 +4.970 +28.995 }}
: error map: {{val| -4.965 -7.240 +6.223 +18.136 }}
* [[CWE]]: ~2 = 1200.000, ~21/20 = 100.109
* [[CWE]]: ~2 = 1200.0000{{c}}, ~21/20 = 100.1093{{c}}
: error map: {{val| 0.000 -2.501 +12.812 +30.956 }}
: error map: {{val| 0.000 -2.501 +12.812 +30.956 }}
* [[POTE]]: ~2 = 1200.000, ~21/20 = 99.483
<!-- * [[CTE]]: ~2 = 1200.000{{c}}, ~21/20 = 101.089{{c}}
: error map: {{val| 0.000 +0.632 +17.825 +32.209 }}
: error map: {{val| 0.000 -7.402 +4.970 +28.995 }}
* [[POTE]]: ~2 = 1200.000{{c}}, ~21/20 = 99.483{{c}}
: error map: {{val| 0.000 +0.632 +17.825 +32.209 }} -->


{{Optimal ET sequence|legend=1| 11c, 12 }}
{{Optimal ET sequence|legend=1| 11c, 12 }}


[[Badness]] (Smith): 0.0597
[[Badness]] (Sintel): 1.51


=== 11-limit ===
=== 11-limit ===
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Optimal tunings:  
Optimal tunings:  
* CTE: ~2 = 1200.000, ~21/20 = 101.923
* WE: ~2 = 1192.7877{{c}}, ~21/20 = 98.7876{{c}}
* CWE: ~2 = 1200.000, ~21/20 = 100.320
* CWE: ~2 = 1200.0000{{c}}, ~21/20 = 100.3202{{c}}
* POTE: ~2 = 1200.000, ~21/20 = 99.385
<!-- * CTE: ~2 = 1200.000{{c}}, ~21/20 = 101.923{{c}}
* POTE: ~2 = 1200.000{{c}}, ~21/20 = 99.385{{c}} -->


{{Optimal ET sequence|legend=0| 11c, 12 }}
{{Optimal ET sequence|legend=0| 11c, 12 }}


Badness (Smith): 0.0388
Badness (Sintel): 1.28


=== 13-limit ===
=== 13-limit ===
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Optimal tunings:  
Optimal tunings:  
* CTE: ~2 = 1200.000, ~21/20 = 102.376
* WE: ~2 = 1189.8521{{c}}, ~21/20 = 97.7384{{c}}
* CWE: ~2 = 1200.000, ~21/20 = 99.762
* CWE: ~2 = 1200.0000{{c}}, ~21/20 = 99.7618{{c}}
* POTE: ~2 = 1200.000, ~21/20 = 98.572
<!-- * CTE: ~2 = 1200.000{{c}}, ~21/20 = 102.376{{c}}
* POTE: ~2 = 1200.000{{c}}, ~21/20 = 98.572{{c}} -->


{{Optimal ET sequence|legend=0| 11c, 12f, 37ccddeeeeffff }}
{{Optimal ET sequence|legend=0| 11c, 12f, 37ccddeeeeffff }}


Badness (Smith): 0.0316
Badness (Sintel): 1.31


== Hemiripple ==
== Hemiripple ==
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[[Optimal tuning]]s:  
[[Optimal tuning]]s:  
* [[CTE]]: ~2 = 1200.000, ~36/35 = 50.231
* [[WE]]: ~2 = 1203.5561{{c}}, ~36/35 = 50.9765{{c}}
: error map: {{val| +3.556 -4.608 +8.730 -13.040 }}
* [[CWE]]: ~2 = 1200.000{{c}}, ~36/35 = 50.5928{{c}}
: error map: {{val| 0.000 -7.883 +4.201 -21.790 }}
<!-- * [[CTE]]: ~2 = 1200.000{{c}}, ~36/35 = 50.231{{c}}
: [[error map]]: {{val| 0.000 -4.264 +9.991 -19.981 }}
: [[error map]]: {{val| 0.000 -4.264 +9.991 -19.981 }}
* [[CWE]]: ~2 = 1200.000, ~36/35 = 50.593
* [[POTE]]: ~2 = 1200.000{{c}}, ~36/35 = 50.826{{c}}
: error map: {{val| 0.000 -7.883 +4.201 -21.790 }}
: error map: {{val| 0.000 -10.214 +0.472 -22.956 }} -->
* [[POTE]]: ~2 = 1200.000, ~36/35 = 50.826
: error map: {{val| 0.000 -10.214 +0.472 -22.956 }}


{{Optimal ET sequence|legend=1| 23d, 24, 47d }}
{{Optimal ET sequence|legend=1| 23d, 24, 47d }}


[[Badness]] (Smith): 0.175
[[Badness]] (Sintel): 4.43


=== 11-limit ===
=== 11-limit ===
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Optimal tunings:  
Optimal tunings:  
* CTE: ~2 = 1200.000, ~36/35 = 50.186
* WE: ~2 = 1203.5344{{c}}, ~36/35 = 50.9757{{c}}
* CWE: ~2 = 1200.000, ~36/35 = 50.587
* CWE: ~2 = 1200.0000{{c}}, ~36/35 = 50.5870{{c}}
* POTE: ~2 = 1200.000, ~36/35 = 50.826
<!-- * CTE: ~2 = 1200.000{{c}}, ~36/35 = 50.186{{c}}
* POTE: ~2 = 1200.000{{c}}, ~36/35 = 50.826{{c}} -->


{{Optimal ET sequence|legend=0| 23de, 24, 47de }}
{{Optimal ET sequence|legend=0| 23de, 24, 47de }}


Badness (Smith): 0.0668
Badness (Sintel): 2.21


=== 13-limit ===
=== 13-limit ===
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Optimal tunings:  
Optimal tunings:  
* CTE: ~2 = 1200.000, ~36/35 = 50.225
* WE: ~2 = 1202.0936{{c}}, ~36/35 = 50.7232{{c}}
* CWE: ~2 = 1200.000, ~36/35 = 50.505
* CWE: ~2 = 1200.0000{{c}}, ~36/35 = 50.5048{{c}}
* POTE: ~2 = 1200.000, ~36/35 = 50.635
<!-- * CTE: ~2 = 1200.000{{c}}, ~36/35 = 50.225{{c}}
* POTE: ~2 = 1200.000{{c}}, ~36/35 = 50.635{{c}} -->


{{Optimal ET sequence|legend=0| 23de, 24 }}
{{Optimal ET sequence|legend=0| 23de, 24 }}


Badness (Smith): 0.0466
Badness (Sintel): 1.93


== Cohemiripple ==
== Cohemiripple ==
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[[Optimal tuning]]s:  
[[Optimal tuning]]s:  
* [[CTE]]: ~2 = 1200.000, ~7/5 = 550.063
* [[WE]]: ~2 = 1200.6977{{c}}, ~7/5 = 550.2638{{c}}
: [[error map]]: {{val| 0.000 -1.328 +14.690 -17.760 }}
: error map: {{val| +0.698 -1.410 +14.418 -17.830 }}
* [[CWE]]: ~2 = 1200.000, ~7/5 = 549.998
* [[CWE]]: ~2 = 1200.0000{{c}}, ~7/5 = 549.9979{{c}}
: error map: {{val| 0.000 -1.976 +13.653 -18.861 }}
: error map: {{val| 0.000 -1.976 +13.653 -18.861 }}
* [[POTE]]: ~2 = 1200.000, ~7/5 = 549.944
<!-- * [[CTE]]: ~2 = 1200.000{{c}}, ~7/5 = 550.063{{c}}
: error map: {{val| 0.000 -2.515 +12.791 -19.777 }}
: error map: {{val| 0.000 -1.328 +14.690 -17.760 }}
* [[POTE]]: ~2 = 1200.000{{c}}, ~7/5 = 549.944{{c}}
: error map: {{val| 0.000 -2.515 +12.791 -19.777 }} -->


{{Optimal ET sequence|legend=1| 11cd, 13cd, 24 }}
{{Optimal ET sequence|legend=1| 11cd, 13cd, 24 }}


[[Badness]] (Smith): 0.190
[[Badness]] (Sintel): 4.81


=== 11-limit ===
=== 11-limit ===
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Optimal tunings:  
Optimal tunings:  
* CTE: ~2 = 1200.000, ~7/5 = 550.060
* WE: ~2 = 1200.6959{{c}}, ~7/5 = 550.2641{{c}}
* CWE: ~2 = 1200.000, ~7/5 = 549.997
* CWE: ~2 = 1200.0000{{c}}, ~7/5 = 549.9969{{c}}
* POTE: ~2 = 1200.000, ~7/5 = 549.945
<!-- * CTE: ~2 = 1200.000{{c}}, ~7/5 = 550.060{{c}}
* POTE: ~2 = 1200.000{{c}}, ~7/5 = 549.945{{c}} -->


{{Optimal ET sequence|legend=0| 11cdee, 13cdee, 24 }}
{{Optimal ET sequence|legend=0| 11cdee, 13cdee, 24 }}


Badness (Smith): 0.0827
Badness (Sintel): 2.73


=== 13-limit ===
=== 13-limit ===
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Optimal tunings:  
Optimal tunings:  
* CTE: ~2 = 1200.000, ~7/5 = 549.987
* WE: ~2 = 1200.1161{{c}}, ~7/5 = 550.0107{{c}}
* CWE: ~2 = 1200.000, ~7/5 = 549.966
* CWE: ~2 = 1200.000{{c}}, ~7/5 = 549.9663{{c}}
* POTE: ~2 = 1200.000, ~7/5 = 549.958
<!-- * CTE: ~2 = 1200.000{{c}}, ~7/5 = 549.987{{c}}
* POTE: ~2 = 1200.000{{c}}, ~7/5 = 549.958{{c}} -->


{{Optimal ET sequence|legend=0| 11cdeef, 13cdeef, 24 }}
{{Optimal ET sequence|legend=0| 11cdeef, 13cdeef, 24 }}


Badness (Smith): 0.0499
Badness (Sintel): 2.06


[[Category:Temperament families]]
[[Category:Temperament families]]
Retrieved from "https://en.xen.wiki/w/Ripple_family"