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Changes and improvements on rule-based Filipino phonemizer #2144

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ef22373
Add a rule-based Filipino phonemizer for DiffSinger
UtaUtaUtau May 17, 2026
fc518a8
add extra digraphs
UtaUtaUtau May 19, 2026
dcc0d5e
add glottal stop insertion, distinguish coda offglides
UtaUtaUtau May 21, 2026
df0e37d
Merge branch 'filipino' into master
UtaUtaUtau May 21, 2026
a27f3b6
Merge pull request #1 from UtaUtaUtau/master
UtaUtaUtau May 21, 2026
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42 changes: 30 additions & 12 deletions OpenUtau.Core/DiffSinger/Phonemizers/DiffSingerRuleBasedFilipinoPhonemizer.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,14 +7,15 @@

namespace OpenUtau.Core.G2p {
public class RuleBasedFilipinoG2p : IG2p {
readonly static Regex kAllPunct = new Regex(@"^[\p{P}]$");
static readonly Regex kAllPunct = new Regex(@"^[\p{P}]$");

private string[] validPhonemes =
{ "m", "n", "ng", "p", "t", "ty", "k", "q", "b", "d", "dy", "g", "s", "sy", "h", "l", "y", "w", "r", "vf", "a", "e", "i", "o", "u" };
private readonly string[] validPhonemes =
["m", "n", "ng", "p", "t", "ty", "k", "q", "b", "d", "dy", "g", "s", "sy", "h", "l", "y", "Y", "w", "W", "r", "vf", "a", "e", "i", "o", "u"
];

private readonly string[] glides = { "w", "y" };
private readonly string[] glides = ["w", "y"];

private string[] vowels = { "a", "e", "i", "o", "u" };
private readonly string[] vowels = ["a", "e", "i", "o", "u"];

public bool IsGlide(string symbol) => glides.Contains(symbol);

Expand Down Expand Up @@ -49,15 +50,20 @@ public string[] Query(string grapheme) {
case 'o':
case 'u':
if (prev.Equals("c")) phonemes[^1] = "k";
else if (IsVowel(prev)) phonemes.Add("q");
phonemes.Add(c.ToString());
break;
case 'e':
if (prev.Equals("c")) phonemes[^1] = "s";
else if (IsVowel(prev)) phonemes.Add("q");
phonemes.Add("e");
break;
case 'i':
if (prev.Equals("c")) phonemes[^1] = "sy";
else phonemes.Add("i");
else if (IsVowel(prev)) {
phonemes.Add("q");
phonemes.Add("i");
} else phonemes.Add("i");
break;
case 'f':
phonemes.Add("p");
Expand All @@ -67,8 +73,18 @@ public string[] Query(string grapheme) {
else phonemes.Add("g");
break;
case 'h':
if (prev.Equals("c")) phonemes[^1] = "ty";
else phonemes.Add("h");
switch (prev)
{
case "c":
phonemes[^1] = "ty";
break;
case "s":
phonemes[^1] = "sh";
break;
default:
phonemes.Add("h");
break;
}
break;
case 'j':
phonemes.Add("dy");
Expand Down Expand Up @@ -101,21 +117,23 @@ public string[] Query(string grapheme) {
}
}

// glide pass
// glide+coda pass
for (int i = 1; i < phonemes.Count - 1; i++) {
string prev = phonemes[i - 1];
string curr = phonemes[i];
string next = phonemes[i + 1];
phonemes[i] = curr switch {
"u" when IsConsonant(prev) && IsVowel(next) => "w",
"i" when IsConsonant(prev) && IsVowel(next) => "y",
"w" when IsVowel(prev) && IsConsonant(next) => "W",
"y" when IsVowel(prev) && IsConsonant(next) => "Y",
_ => phonemes[i]
};
}

// extra palatalization pass
// end coda
if (IsVowel(phonemes[^2]) && IsGlide(phonemes[^1])) phonemes[^1] = phonemes[^1].ToUpperInvariant();


string[] filteredPhonemes = phonemes.Where(x => validPhonemes.Contains(x)).ToArray();

return (filteredPhonemes.Length == 0) ? null : filteredPhonemes;
Expand All @@ -137,7 +155,7 @@ public class DiffSingerRuleBasedFilipinoPhonemizer : DiffSingerG2pPhonemizer {
};

protected override string[] GetBaseG2pConsonants() => new string[] {
"m", "n", "ng", "p", "t", "ty", "k", "q", "b", "d", "dy", "g", "s", "sy", "h", "l", "y", "w", "r", "vf"
"m", "n", "ng", "p", "t", "ty", "k", "q", "b", "d", "dy", "g", "s", "sy", "h", "l", "y", "Y", "w", "W", "r", "vf"
};
}
}
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