Delta-rational chord: Difference between revisions
No edit summary Tags: Mobile edit Mobile web edit |
Tags: Mobile edit Mobile web edit |
||
| Line 21: | Line 21: | ||
=== Facts === | === Facts === | ||
==== Finding a tuning of a MOS scale with an exact DR chord ==== | ==== Finding a tuning of a MOS scale with an exact DR chord ==== | ||
Let ''a'', ''b'' be positive integers and suppose gcd(''a'', ''b'') = 1. Let ''E'' > 1 be the frequency ratio of the equave. Consider a MOS ''a'''''L'''''b'''''s'''{{angbr|''E''}} with generator range <math>I \subseteq (1, \sqrt{E})</math> (in the linear frequency domain), and consider a triple ('''0''', '''u''', '''v''') | Let ''a'', ''b'' be positive integers and suppose gcd(''a'', ''b'') = 1. Let ''E'' > 1 be the frequency ratio of the equave. Consider a MOS ''a'''''L'''''b'''''s'''{{angbr|''E''}} with generator range <math>I \subseteq (1, \sqrt{E})</math> (in the linear frequency domain), and consider a triple ('''0''', '''u''', '''v''') of notes from the root of a given triad in the MOS, '''0''' < '''u''' < '''v'''. Let '''p''', '''g''' be a basis formally representing the MOS scale's period and generator. Write | ||
<math>\begin{align} | <math>\begin{align} | ||