back to list

Yet another 5-limit comma list

🔗Gene W Smith <genewardsmith@juno.com>

6/18/2002 9:27:47 PM

This one comes from the condition ln(p-q)/ln(q) < 3/4, cents < 50. One
way to think of the first condition is as follows: writing the comma p/q
as 1 + a/q, if ln(a)/ln(q) < e then a < q^e. We thus have a weaker
condition than requiring a to be less than a constant, by limiting its
size relative to q.

250/243, 1638400/1594323, 128/125, 1594323/1562500, 1990656/1953125,
3125/3072, 20000/19683, 531441/524288, 81/80, 2048/2025,
67108864/66430125, 129140163/128000000, 78732/78125, 393216/390625,
2109375/2097152, 15625/15552, 1600000/1594323, 1224440064/1220703125,
10485760000/10460353203, 6115295232/6103515625, 32805/32768,
274877906944/274658203125, 7629394531250/7625597484987

What do people think of this as a list of 5-limit temperaments?

🔗emotionaljourney22 <paul@stretch-music.com>

6/19/2002 12:26:56 AM

--- In tuning-math@y..., Gene W Smith <genewardsmith@j...> wrote:
> This one comes from the condition ln(p-q)/ln(q) < 3/4, cents < 50.
One
> way to think of the first condition is as follows: writing the
comma p/q
> as 1 + a/q, if ln(a)/ln(q) < e then a < q^e. We thus have a weaker
> condition than requiring a to be less than a constant, by limiting
its
> size relative to q.
>
> 250/243, 1638400/1594323, 128/125, 1594323/1562500,
1990656/1953125,
> 3125/3072, 20000/19683, 531441/524288, 81/80, 2048/2025,
> 67108864/66430125, 129140163/128000000, 78732/78125, 393216/390625,
> 2109375/2097152, 15625/15552, 1600000/1594323,
1224440064/1220703125,
> 10485760000/10460353203, 6115295232/6103515625, 32805/32768,
> 274877906944/274658203125, 7629394531250/7625597484987
>
> What do people think of this as a list of 5-limit temperaments?

not bad, i'd say -- this could be justified in terms of the heuristic
combined with an appropriate badness function of complexity and error.