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(** Sonority module for determining the sonority of phonetic segments.
This module provides functionality to determine the sonority of IPA
(International Phonetic Alphabet) segments on a scale of 1 to 9, where:
- 9: Low vowels (most sonorous)
- 8: High vowels
- 7: Glides/approximants
- 6: Liquids
- 5: Nasals
- 4: Voiced fricatives
- 3: Voiceless fricatives
- 2: Voiced stops
- 1: Voiceless stops (least sonorous)
Example usage:
{[
(* Initialize the module with the data directory *)
Sonority.init "./data";;
(* Get sonority values for IPA segments *)
Sonority.sonority "a";;
(* Returns 9 - low vowel *)
Sonority.sonority "p";;
(* Returns 1 - voiceless stop *)
Sonority.sonority "l" (* Returns 6 - liquid *)
]} *)
val init : string -> unit
(** Initialize the sonority module with the data directory. This must be called
before using other functions.
@param data_dir The directory containing the ipa_all.csv file
@raise Sys_error if the CSV file cannot be found or read *)
val sonority : string -> int
(** Get the sonority value (1-9) for an IPA character.
@param ipa The IPA character/segment to analyze
@return The sonority value between 1 and 9
@raise Failure if the IPA segment is not recognized *)
val sonority_from_features : Feature.segment -> int
(** Get the sonority value from a feature specification. This is useful when you
already have the phonological features of a segment and don't need to look
it up by IPA symbol.
@param segment The list of feature specifications
@return The sonority value between 1 and 9 *)
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