---
language:
- en
- lug
license: cc-by-4.0
task_categories:
- automatic-speech-recognition
- translation
pretty_name: Synthetic Parallel EN-LG (external)
---

# Synthetic Parallel EN↔LG — external

Voice-controlled synthetic parallel speech dataset for Luganda-English
speech-to-speech translation, generated by the Hibiki-Zero fine-tuning pipeline.

## Generation

| Component | Model |
|-----------|-------|
| Translation | `Sunbird/translate-nllb-3.3b-salt` |
| TTS | `Sunbird/orpheus-3b-tts-multilingual` |

**English speakers:** `salt_eng_0001, salt_eng_0002, salt_eng_0003`

**Luganda speakers:** `salt_lug_0001, waxal_lug_0001, waxal_lug_0002, waxal_lug_0003, waxal_lug_0004, waxal_lug_0005, waxal_lug_0007`

**Speaker sampling:** N ∈ {1 (70%), 2 (20%), 3 (10%)} draws per text pair.

## Source datasets (transcripts only — source audio discarded)

  - `evie-8/afrispeech-200` (subset: `default`, lang: eng)
  - `yigagilbert/combined-audio-eng` (subset: `default`, lang: eng)
  - `yigagilbert/cv24-lug-eng` (subset: `default`, lang: eng)

## Post-processing

- Silero / energy VAD silence trim on every clip
- Duration filter: Luganda 1.5–30.0 s,
  English 1.0–30.0 s
- Duration ratio filter: 0.3–4.0
- Speech-activity filter: ≥ 0.35
- Sample rate: 24000 Hz (mono, float32 → PCM-16 WAV)

## Schema

| Column | Type | Description |
|--------|------|-------------|
| `audio_lug` | Audio | Luganda synthesized clip |
| `audio_eng` | Audio | English synthesized clip |
| `text_lug` | string | Luganda transcript |
| `text_eng` | string | English transcript |
| `speaker_lug` | string | Orpheus speaker ID used for Luganda |
| `speaker_eng` | string | Orpheus speaker ID used for English |
| `src_dur_s` | float | Luganda clip duration after VAD trim (s) |
| `tgt_dur_s` | float | English clip duration after VAD trim (s) |
| `dur_ratio` | float | tgt / src duration ratio |
| `src_speech_ratio` | float | VAD speech fraction — Luganda |
| `tgt_speech_ratio` | float | VAD speech fraction — English |
| `source_dataset` | string | Originating HF dataset repo |
| `source_subset` | string | Originating subset / config name |

## Failure manifest

Rows that failed TTS generation (after 3 retries) or post-processing
are logged to: [https://huggingface.co/datasets/yigagilbert/synthetic-parallel-external/resolve/main/failure_manifest.jsonl](https://huggingface.co/datasets/yigagilbert/synthetic-parallel-external/resolve/main/failure_manifest.jsonl)