Update README.md

README.md

@@ -42,6 +42,7 @@ Here's a breakdown of the number of recordings under each speaker:
 ## Dataset Construction
 
 1. Gathering
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 We first identified 3,904 common Cantonese syllables based on words.hk's syllable recordings.
 The, we ask the speech synthesis APIs to pronounce each of the syllables.
 The queries use SSML's phoneme attribute to precisely specify the syllable we want. Here's a sample SSML query that fetches the syllable jyut6:
@@ -52,11 +53,13 @@ The queries use SSML's phoneme attribute to precisely specify the syllable we wa
 Apple voices are gathered using jyutping text directly and a native Cantonese ASR system is used to filter out unsupported syllables.
 
 2. Preprocessing
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 * All audios are converted to 16kHz WAV files
 * Peak normalize all audios to -20 dBFS
 * Clip silence at the beginning and end (sound below -50 dBFS are deemed silence)
 
 3. Verification
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 Occassionally, some syllables are not synthesized correctly.
 * Apple voices usually renders tone 5 syllables as tone 2: we remove all tone 5 syllables from apple voices 
 * Microsoft voices prepends consonants like ng, g, and b in front of isolate vowel syllables like aa: we remove all vowel syllables from microsoft voices