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Add quarter-comma meantone tuning

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This commit is contained in:
Paul Mathieu
2025-04-19 13:48:53 -07:00
parent 865823b00d
commit 97c33b7d13
2 changed files with 26 additions and 32 deletions
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28
index.html
View File

@@ -39,26 +39,14 @@
<article>
<fieldset>
<legend><small>Tuning</small></legend>
<label>
<input type="radio" name="tuning" value="equal">
Equal temperament
</label>
<label>
<input type="radio" name="tuning" value="5th">
Perfect 5th
</label>
<label>
<input type="radio" name="tuning" value="4th">
Perfect 4th
</label>
<label>
<input type="radio" name="tuning" value="maj3rd">
Perfect major 3rd
</label>
<label>
<input type="radio" name="tuning" value="min3rd">
Perfect minor 3rd
</label>
<select id="tuning">
<option value="equal">Equal</option>
<option value="perfect-5th">Perfect 5th</option>
<option value="lower-5th">Lower 5th</option>
<option value="quartmean-5th">Quarter-comma meantone 5th</option>
<option value="quartmean-lower-5th">Quarter-comma meantone lower 5th</option>
<option value="perfect-3rd">Perfect major 3rd</option>
</select>
<label>
From:
<select id="tuning-from"></select>

30
index.js
View File

@@ -243,10 +243,14 @@ function refreshHolds() {
}
}
function tuneFraction(key, fromKey, fraction) {
function tuneFactor(key, fromKey, factor) {
const index = keyIndex(key);
const fromIndex = keyIndex(fromKey);
const freq = frequencies[fromIndex] * fraction;
setFrequency(key, freq);
if (index > fromIndex) {
setFrequency(key, frequencies[fromIndex] * factor);
} else {
setFrequency(key, frequencies[fromIndex] / factor);
}
}
function tuneEqual(key, fromKey) {
@@ -305,17 +309,19 @@ function setupListeners() {
document.getElementById('tune').onclick = () => {
const key = document.getElementById("current-note").innerHTML;
const fromkey = document.getElementById('tuning-from').value;
const method = radioValue('tuning');
const method = document.getElementById('tuning').value;
if (method === 'equal') {
tuneEqual(key, fromkey);
} else if (method === '5th') {
tuneFraction(key, fromkey, 3/2);
} else if (method === '4th') {
tuneFraction(key, fromkey, 4/3);
} else if (method === 'maj3rd') {
tuneFraction(key, fromkey, 5/4);
} else if (method === 'min3rd') {
tuneFraction(key, fromkey, 6/5);
} else if (method === 'perfect-5th') {
tuneFactor(key, fromkey, 3/2);
} else if (method === 'lower-5th') {
tuneFactor(key, fromkey, 2/3);
} else if (method === 'quartmean-5th') {
tuneFactor(key, fromkey, Math.pow(5, 1/4));
} else if (method === 'quartmean-lower-5th') {
tuneFactor(key, fromkey, Math.pow(5, 1/4));
} else if (method === 'perfect-3rd') {
tuneFactor(key, fromkey, 5/4);
}
refreshHolds();
updateOptions(key);