OLaPh: Optimal Language Phonemizer
Paper • 2509.20086 • Published
Datasets:
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0,2-Liter-Flasche /nʊlkɔmat͡svaɪ̯ˈliːtɐˌflaʃə/ |
0,2-Liter-Flaschen /nʊlkɔmat͡svaɪ̯ˈliːtɐˌflaʃn̩/ |
0,33-Liter-Flasche /nʊlkɔmadʁaɪ̯dʁaɪ̯ˈliːtɐˌflaʃə/ |
0,33-Liter-Flaschen /nʊlkɔmadʁaɪ̯dʁaɪ̯ˈliːtɐˌflaʃn̩/ |
0,5-Liter-Flasche /nʊlkɔmafʏnfˈliːtɐˌflaʃə/ |
0,5-Liter-Flaschen /nʊlkɔmafʏnfˈliːtɐˌflaʃn̩/ |
0,7-Liter-Flasche /nʊlkɔmaziːbn̩ˈliːtɐˌflaʃə/ |
0,7-Liter-Flaschen /nʊlkɔmaziːbn̩ˈliːtɐˌflaʃn̩/ |
0,75-Liter-Flasche /nʊlkɔmaziːbn̩fʏnfˈliːtɐˌflaʃə/ |
0,75-Liter-Flaschen /nʊlkɔmaziːbn̩fʏnfˈliːtɐˌflaʃn̩/ |
08/15 /nʊlʔaxtˈfʏnft͡seːn/ |
1,2-Butadien /ˌaɪ̯nsˌt͡svaɪ̯ˌbutaˈdi̯eːn/ |
1,2-Butadiens /ˌaɪ̯nsˌt͡svaɪ̯ˌbutaˈdi̯eːns/ |
1,2-Propylenglycol /ˌaɪ̯nst͡svaɪ̯pʁopyleːnɡlyˈkoːl/ |
1,2-Propylenglycols /ˌaɪ̯nst͡svaɪ̯pʁopyleːnɡlyˈkoːls/ |
1,3-Butadien /ˌaɪ̯nsˌdʁaɪ̯ˌbutaˈdi̯eːn/ |
1,3-Butadiens /ˌaɪ̯nsˌdʁaɪ̯ˌbutaˈdi̯eːns/ |
1,3-Propandiol /aɪ̯nsdʁaɪ̯ˌpʁopandiˈʔoːl/ |
1,3-Propandiols /aɪ̯nsdʁaɪ̯ˌpʁopandiˈʔoːls/ |
1,5-Grad-Ziel /aɪ̯nskɔmafʏnfˈɡʁaːtˌt͡siːl/ |
1,5-Grad-Zieles /aɪ̯nskɔmafʏnfˈɡʁaːtˌt͡siːləs/ |
1,5-Grad-Ziels /aɪ̯nskɔmafʏnfɡʁaːtˌt͡siːls/ |
1,6-Liter-Benziner /ˈaɪ̯ns ˌkɔma ˈzɛks ˈliːtɐ ˌbɛnˈt͡siːnɐ/ |
1,6-Liter-Benzinern /ˈaɪ̯ns ˌkɔma ˈzɛks ˈliːtɐ/ˈlɪtɐ ˌbɛnˈt͡siːnɐn/ |
1,6-Liter-Benziners /ˈaɪ̯ns ˌkɔma ˈzɛks ˈliːtɐ/ˈlɪtɐ ˌbɛnˈt͡siːnɐs/ |
1-Benzolethansäure /ˌaɪ̯nsbɛnt͡soːlʔeˈtaːnzɔɪ̯ʁə/ |
1-Butanol /ˌaɪ̯nsbutaˈnoːl/ |
1-Butanols /ˌaɪ̯nsbutaˈnoːls/ |
1-Cent-Münze /aɪ̯nˈt͡sɛntˌmʏnt͡sə/ |
1-Cent-Münzen /aɪ̯nˈt͡sɛntˌmʏnt͡sn̩/ |
1-Cent-Stück /aɪ̯nˈt͡sɛntˌʃtʏk/ |
1-Cent-Stücke /aɪ̯nˈt͡sɛntˌʃtʏkə/ |
1-Cent-Stücken /aɪ̯nˈt͡sɛntˌʃtʏkn̩/ |
1-Cent-Stückes /aɪ̯nˈt͡sɛntˌʃtʏkəs/ |
1-Cent-Stücks /aɪ̯nˈt͡sɛntˌʃtʏks/ |
1-Euro-Job /aɪ̯nˈʔɔɪ̯ʁod͡ʒɔp/ |
1-Euro-Jobber /ˌaɪ̯nˈʔɔɪ̯ʁoˌd͡ʒɔbɐ/ |
1-Euro-Jobbern /ˌaɪ̯nˈʔɔɪ̯ʁoˌd͡ʒɔbɐn/ |
1-Euro-Jobbers /ˌaɪ̯nˈʔɔɪ̯ʁoˌd͡ʒɔbɐs/ |
1-Euro-Jobs /aɪ̯nˈʔɔɪ̯ʁod͡ʒɔps/ |
1-Euro-Münze /aɪ̯nˈʔɔɪ̯ʁoˌmʏnt͡sə/ |
1-Euro-Münzen /aɪ̯nˈʔɔɪ̯ʁoˌmʏnt͡sn̩/ |
1-Euro-Stück /aɪ̯nˈʔɔɪ̯ʁoˌʃtʏk/ |
1-Euro-Stücke /aɪ̯nˈʔɔɪ̯ʁoˌʃtʏkə/ |
1-Euro-Stücken /aɪ̯nˈʔɔɪ̯ʁoˌʃtʏkn̩/ |
1-Euro-Stückes /aɪ̯nˈʔɔɪ̯ʁoˌʃtʏkəs/ |
1-Euro-Stücks /aɪ̯nˈʔɔɪ̯ʁoˌʃtʏks/ |
1-Hepten /ˌaɪ̯nshɛpˈteːn/ |
1-Heptens /ˌaɪ̯nshɛpˈteːns/ |
1-Meter-Brett /aɪ̯nˈmeːtɐˌbʁɛt/ |
1-Meter-Brette /aɪ̯nˈmeːtɐˌbʁɛtə/ |
1-Meter-Bretter /aɪ̯nˈmeːtɐˌbʁɛtɐ/ |
1-Meter-Brettern /aɪ̯nˈmeːtɐˌbʁɛtɐn/ |
1-Meter-Brettes /aɪ̯nˈmeːtɐˌbʁɛtəs/ |
1-Meter-Bretts /aɪ̯nˈmeːtɐˌbʁɛt͡s/ |
1-Pentanol /ˌaɪ̯nspɛntaˈnoːl/ |
1-Pentanols /ˌaɪ̯nspɛntaˈnoːls/ |
1-Propanol /ˌaɪ̯nspʁopaˈnoːl/ |
1-Propanols /ˌaɪ̯nspʁopaˈnoːls/ |
1-Raum-Wohnung /ˈaɪ̯nʁaʊ̯mˌvoːnʊŋ/ |
1-Raum-Wohnungen /ˈaɪ̯nʁaʊ̯mˌvoːnʊŋən/ |
1-Zimmer-Wohnung /aɪ̯nˈt͡sɪmɐˌvoːnʊŋ/ |
1-Zimmer-Wohnungen /aɪ̯nˈt͡sɪmɐˌvoːnʊŋən/ |
1-achsig /ˈaɪ̯nˌʔaksɪk/ |
1-achsige /ˈaɪ̯nˌʔaksɪɡə/ |
1-achsigem /ˈaɪ̯nˌʔaksɪɡəm/ |
1-achsigen /ˈaɪ̯nˌʔaksɪɡn̩/ |
1-achsiger /ˈaɪ̯nˌʔaksɪɡɐ/ |
1-achsiges /ˈaɪ̯nˌʔaksɪɡəs/ |
1-m-Brett /aɪ̯nˈmeːtɐˌbʁɛt/ |
1-m-Brette /aɪ̯nˈmeːtɐˌbʁɛtə/ |
1-m-Bretter /aɪ̯nˈmeːtɐˌbʁɛtɐ/ |
1-m-Brettern /aɪ̯nˈmeːtɐˌbʁɛtɐn/ |
1-m-Brettes /aɪ̯nˈmeːtɐˌbʁɛtəs/ |
1-m-Bretts /aɪ̯nmeːtɐˌbʁɛt͡s/ |
1-minütig /ˈaɪ̯nmiˌnyːtɪk/ |
1-minütige /ˈaɪ̯nmiˌnyːtɪɡə/ |
1-minütigem /ˈaɪ̯nmiˌnyːtɪɡəm/ |
1-minütigen /ˈaɪ̯nmiˌnyːtɪɡn̩/ |
1-minütiger /ˈaɪ̯nmiˌnyːtɪɡɐ/ |
1-minütiges /ˈaɪ̯nmiˌnyːtɪɡəs/ |
1-prozentig /ˈaɪ̯npʁoˌt͡sɛntɪk/ |
1-prozentige /ˈaɪ̯npʁoˌt͡sɛntɪɡə/ |
1-prozentigem /ˈaɪ̯npʁoˌt͡sɛntɪɡəm/ |
1-prozentigen /ˈaɪ̯npʁoˌt͡sɛntɪɡn̩/ |
1-prozentiger /ˈaɪ̯npʁoˌt͡sɛntɪɡɐ/ |
1-prozentiges /ˈaɪ̯npʁoˌt͡sɛntɪɡəs/ |
1-tägig /ˈaɪ̯nˌtɛːɡɪk/ |
1-tägige /ˈaɪ̯nˌtɛːɡɪɡə/ |
1-tägigem /ˈaɪ̯nˌtɛːɡɪɡəm/ |
1-tägigen /ˈaɪ̯nˌtɛːɡɪɡn̩/ |
1-tägiger /ˈaɪ̯nˌtɛːɡɪɡɐ/ |
1-tägiges /ˈaɪ̯nˌtɛːɡɪɡəs/ |
1-wöchig /ˈaɪ̯nˌvœçɪk/ |
1-wöchige /ˈaɪ̯nˌvœçɪɡə/ |
1-wöchigem /ˈaɪ̯nˌvœçɪɡəm/ |
1-wöchigen /ˈaɪ̯nˌvœçɪɡn̩/ |
1-wöchiger /ˈaɪ̯nˌvœçɪɡɐ/ |
1-wöchiges /ˈaɪ̯nˌvœçɪɡəs/ |
1. Johannesbrief /ˌeːɐ̯stɐ joˈhanəsˌbʁiːf/ |
End of preview. Expand in Data Studio
G2P Pronunciation Dictionaries for CrispASR
IPA pronunciation dictionaries for text-to-phoneme conversion in TTS backends (piper, kokoro, melotts). Auto-downloaded by CrispASR on first use.
Pre-generated IPA Dictionaries (primary — piper-compatible)
Pre-generated IPA transcriptions matching the phoneme inventory of piper TTS models. These are factual phonetic data — word-to-IPA mappings generated by processing vocabulary lists through a phonemization engine.
| File | Language | Entries | Size | Source vocabulary |
|---|---|---|---|---|
espeak_en_us.tsv |
English (US) | 126K | 3 MB | CMUdict (BSD) |
espeak_de.tsv |
German | 667K | 23 MB | open-dict-data single words |
espeak_fr.tsv |
French | 257K | 6.6 MB | OLaPh FR (MIT) |
espeak_es.tsv |
Spanish | 600K | 18 MB | OLaPh ES (MIT) |
Format: word\t/IPA/ (tab-separated, IPA in slashes, one entry per line)
Benchmark: 99.5% exact match (EN) / 100% (DE) against piper model ground truth on a 382-word test set.
CMUdict (English ARPAbet — fallback)
| File | Language | Entries | Source | License |
|---|---|---|---|---|
cmudict.dict |
English | 126K | CMU Sphinx | BSD |
Format: WORD PH1 PH2 PH3 (space-separated ARPAbet phonemes).
CrispASR converts ARPAbet to IPA at runtime (76% piper match rate).
OLaPh Dictionaries (MIT — multilingual fallback)
| File | Language | Entries | License |
|---|---|---|---|
olaph_en_us.txt |
English (US) | 508K | MIT |
olaph_de.txt |
German | 1.12M | MIT |
olaph_fr.txt |
French | 259K | MIT |
olaph_es.txt |
Spanish | 600K | MIT |
Format: word\t/IPA/ (same as pre-generated dicts).
OLaPh uses British English IPA conventions (ɐ for -er, ɒ for LOT);
the pre-generated dicts above use American conventions matching piper models.
Source: iisys-hof/olaph — Becker et al., "OLaPh: Optimal Language Phonemizer", arXiv:2509.20086, MIT license.
Usage in CrispASR
Dictionaries are auto-downloaded to ~/.cache/crispasr/ on first TTS use:
# Default: uses pre-generated IPA dicts (piper-compatible)
crispasr --backend piper -m auto --auto-download --tts "Hello world" --tts-output out.wav
# Select dictionary source explicitly
crispasr --backend piper --g2p-dict cmudict --tts "Hello world" --tts-output out.wav
crispasr --backend piper --g2p-dict olaph --tts "Hello world" --tts-output out.wav
# Use a custom dictionary file
crispasr --backend piper --g2p-dict /path/to/my/dict.txt --tts "Hello world" --tts-output out.wav
Override per-language paths with environment variables:
CRISPASR_CMUDICT_PATH— English CMUdict fileCRISPASR_DE_DICT_PATH/CRISPASR_FR_DICT_PATH/CRISPASR_ES_DICT_PATH
Phonemization Cascade
CrispASR tries pronunciation sources in priority order:
- Pre-generated IPA dict (99.5% piper match) — auto-downloaded
- CMUdict + ARPAbet→IPA (EN, 76% match) / OLaPh (DE/FR/ES)
- LTS rules (letter-to-sound, always available, zero dependencies)
- espeak-ng via dlopen (loaded at runtime if installed on system)
- espeak-ng via popen (subprocess fallback)
Attribution
- CMUdict: Carnegie Mellon University, BSD license. https://github.com/cmusphinx/cmudict
- OLaPh: Becker, M. et al. (2025). "OLaPh: Optimal Language Phonemizer." arXiv:2509.20086. MIT license. https://github.com/iisys-hof/olaph
- open-dict-data: CC-BY-SA 3.0 (Wiktionary-sourced). https://github.com/open-dict-data/ipa-dict
License
This dataset is released under the MIT license.
- Pre-generated IPA dicts: factual phonetic data (word→IPA mappings)
- CMUdict: BSD license
- OLaPh dicts: MIT license
- open-dict-data vocabulary (used as word source for DE): CC-BY-SA 3.0
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