User:Cmloegcmluin/APS: Difference between revisions
(Temporarily) clarify that this can be specified two ways. In the end it may entail distinct symbols for pitch relation and frequency ratio |
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An '''APS''', or '''arithmetic pitch sequence''', is a kind of [[Arithmetic tunings|arithmetic]] and [[Harmonotonic tunings|harmonotonic]] [[tuning]]. It can also be called an '''equal multiplication'''. | An '''APS''', or '''arithmetic pitch sequence''', is a kind of [[Arithmetic tunings|arithmetic]] and [[Harmonotonic tunings|harmonotonic]] [[tuning]]. It can also be called an '''equal multiplication'''. | ||
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== List of notable APSs == | |||
{{See also| AS #List of ASs }} | |||
* APS35.099¢, tuning of [[Carlos Gamma]] | |||
* APS63.833¢, tuning of [[Carlos Beta]] | |||
* [[1ed69c|APS69¢]] | |||
* APS77.965¢, tuning of [[Carlos Alpha]] | |||
* [[1ed86.4c|APS86.4¢]] | |||
* [[88cET|APS88¢]] | |||
* [[1ed97.5c|APS97.5¢]] | |||
* [[1ed125c|APS125¢]] | |||
For a more complete list, see [[Gallery of arithmetic pitch sequences]]. But do note that the gallery includes many obscure tunings that are of less importance to most xenharmonicists compared to the more curated selection listed above. | |||
[[Category:Equal-step tuning]] | [[Category:Equal-step tuning]] | ||
[[Category:Xenharmonic series]] | [[Category:Xenharmonic series]] | ||
Latest revision as of 01:40, 19 May 2025
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An APS, or arithmetic pitch sequence, is a kind of arithmetic and harmonotonic tuning. It can also be called an equal multiplication.
Specification
Its full specification is (n-)APS-p: (n pitches of an) arithmetic pitch sequence adding by interval p.
Note:
- The n is optional. If not provided, the sequence is open-ended.
- The p can be dimensionless, in which case it refers to an interval by its frequency ratio. It can also take a unit proportional to octaves, in which case it refers to an interval by its pitch relation.
Formula
The pitch of k steps of APS-p is quite simply k⋅p for a pitch (log-frequency) quantity p.
Relationship to other tunings
Vs. rank-1 temperaments
By applying a mapping, APS-p becomes an equal temperament with generator p.
Vs. EPD
If the n is not specified, an APS will be equivalent to an equal pitch division (EPD). Specifically, n-EPD-p = APS(p/n) for a pitch quantity p. For example, 12-EPD1200¢ = APS(1200¢/12) = APS100¢.
Vs. AS
The only difference between an APS and an AS (ambitonal sequence) is that the p for an AS must be rational.
Examples
| Quantity | (0) | 1 | 2 | 3 | 4 |
|---|---|---|---|---|---|
| frequency (f, ratio) | (1) | 1.19 | 1.41 | 1.68 | 2 |
| length (1/f, ratio) | (0/4) | 1/4 | 2/4 | 3/4 | 4/4 |
| Length (1/f) | (1) | 0.84 | 0.71 | 0.59 | 0.5 |
List of notable APSs
- APS35.099¢, tuning of Carlos Gamma
- APS63.833¢, tuning of Carlos Beta
- APS69¢
- APS77.965¢, tuning of Carlos Alpha
- APS86.4¢
- APS88¢
- APS97.5¢
- APS125¢
For a more complete list, see Gallery of arithmetic pitch sequences. But do note that the gallery includes many obscure tunings that are of less importance to most xenharmonicists compared to the more curated selection listed above.