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---
license: cc0-1.0
task_categories:
- text-to-speech
- automatic-speech-recognition
language:
- 'no'
- nb
tags:
- librivox
pretty_name: NB-LibriVox
size_categories:
- 1K<n<10K
---
# 📄 NB-LibriVox
A high-quality Norwegian text-to-speech (TTS) dataset derived from LibriVox public domain audiobooks. It includes audio clips with pseudo-aligned transcripts and punctuation, curated by the National Library of Norway for speech synthesis and ASR research.
---
## 📂 Dataset Overview
| **Field** | **Description** |
|-------------------|---------------------------------------------------------------------------------|
| `file_name` | Audio file name in `.wav` format |
| `id` | Unique identifier for each utterance/sample |
| `text` | Transcript automatically generated using NB-Whisper Large and nb-wav2vec2 |
| `text_punct` | Transcript with punctuation automatically added using Qwen3 |
| `speaker_id` | Identifier of the speaker |
| `speaker_name` | Name of the speaker |
| `speaker_gender` | Gender of the speaker (e.g., `male`, `female`, `unknown`) |
| `speaker_status` | Speaker's native status (e.g., `L1`, `L2`) |
| `title` | Title of the source audiobook |
| `author` | Author of the original text |
| `sequence` | Position of the utterance within the audiobook file |
| `duration` | Duration of the audio clip in seconds |
### Speaker Stats by Sample Count
| speaker_name | speaker_id | speaker_status | sample_count | total_duration (hrs) | avg_duration (secs) |
|------------------|----------------------|---------------|---------------|-----------------------|----------------------|
| Kathrine Engan | female_no_librivox_1 | L1 | 4,873 | 9.0871 | 6.713 |
| Kristin G | female_no_librivox_2 | L1 | 18 | 0.0525 | 10.388 |
| Austin Smith | male_no_librivox_male_1 | L2 | 16 | 0.0170 | 3.822 |
---
## 📌 Additional Information
- **Language**: Norwegian (Bokmål)
- **Audio Format**: MPEG ADTS, layer III, v1, 64 kbps, 48 kHz, Monaural
- **Text Alignment**:
- **Method**: Pseudo-labeling and splitting of sentences up to 30 seconds
- **ASR Model**: [`NB-Whisper Large`](https://huggingface.co/NbAiLab/nb-whisper-large)
- **Supplementary Model**: [`nb-wav2vec2`](https://huggingface.co/NbAiLab/nb-wav2vec2-1b-bokmaal-v2)
- **Alignment Type**: Pseudo-labeling (not force-aligned)
- **Punctuation Model**: [Qwen3 235B](https://huggingface.co/Qwen/Qwen3-235B-A22B)
- **Total Duration**: 9 hours
- **Total Samples**: 4907 samples
---
## 📜 Licensing & Usage
- **License**: Creative Commons Zero (CC0)
- **Data Source**: LibriVox public domain recordings
- **Dataset Creator**: National Library of Norway
> Free to use, modify, and distribute for any purpose, including commercial use.
---
## ⚠️ Ethical Considerations
- All content is in the public domain and CC0-licensed.
- Speakers are volunteers; synthesized voices should not be used in misleading or impersonating contexts.
- Encourage transparency when using in generative applications (e.g., voice assistants, synthetic speech).
---
## 📎 Citation
> “Norwegian LibriVox TTS Dataset (CC0), curated by the National Library of Norway. Transcripts pseudo-labeled using NB-Whisper Large and nb-wav2vec2.” |