| --- |
| license: mit |
| language: |
| - en |
| - de |
| - fr |
| - es |
| task_categories: |
| - text-to-speech |
| tags: |
| - g2p |
| - phonemization |
| - ipa |
| - pronunciation |
| - tts |
| - piper |
| pretty_name: G2P Pronunciation Dictionaries |
| size_categories: |
| - 1M<n<10M |
| --- |
| |
| # 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](https://github.com/cmusphinx/cmudict) (BSD) | |
| | `espeak_de.tsv` | German | 667K | 23 MB | [open-dict-data](https://github.com/open-dict-data/ipa-dict) single words | |
| | `espeak_fr.tsv` | French | 257K | 6.6 MB | [OLaPh](https://github.com/iisys-hof/olaph) FR (MIT) | |
| | `espeak_es.tsv` | Spanish | 600K | 18 MB | [OLaPh](https://github.com/iisys-hof/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](https://github.com/cmusphinx/cmudict) | 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](https://github.com/iisys-hof/olaph) — |
| Becker et al., "OLaPh: Optimal Language Phonemizer", |
| [arXiv:2509.20086](https://arxiv.org/abs/2509.20086), MIT license. |
|
|
| ## Usage in CrispASR |
|
|
| Dictionaries are auto-downloaded to `~/.cache/crispasr/` on first TTS use: |
|
|
| ```bash |
| # 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 file |
| - `CRISPASR_DE_DICT_PATH` / `CRISPASR_FR_DICT_PATH` / `CRISPASR_ES_DICT_PATH` |
|
|
| ## Phonemization Cascade |
|
|
| CrispASR tries pronunciation sources in priority order: |
|
|
| 1. **Pre-generated IPA dict** (99.5% piper match) — auto-downloaded |
| 2. **CMUdict + ARPAbet→IPA** (EN, 76% match) / **OLaPh** (DE/FR/ES) |
| 3. **LTS rules** (letter-to-sound, always available, zero dependencies) |
| 4. **espeak-ng via dlopen** (loaded at runtime if installed on system) |
| 5. **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 |
|
|
