---
license: other
task_categories:
- audio-classification
- feature-extraction
language:
- ja
tags:
- speech
- japanese
- pitch-accent
- benchmark
- pronunciation
size_categories:
- 10K<n<100K
---

# Katachi Benchmark Corpora (`juxtnorth/katachi-benchmarks`)

High-precision phonetic & acoustic benchmark suites for Japanese speech evaluation, pitch accent contour analysis, and micro-stutter detection.

## Dataset Structure & Download Archives

This repository hosts pre-processed, downsampled (16kHz mono), and loudness-normalized (-23 LUFS) benchmark datasets for the Katachi evaluation engine. Assets are packaged as modular domain bundles for fast, zero-dependency streaming:

- **`corpora/jvs-certification-16k.tar.gz`**: JVS (Japanese Versatile Speech) Corpus — 100 native speakers, 16kHz Sinc downsampled, normalized to -23 LUFS (15,000 utterances).
- **`corpora/jsut-certification-16k.tar.gz`**: JSUT basic5000 Corpus — Single speaker phonetically balanced sentences, 16kHz Sinc downsampled, -23 LUFS (7,696 utterances).
- **`corpora/synthetic-adversarial.tar.gz`**: 14 adversarial stress test fixtures across Categories A-D (glottal blocks, pitch drops, flutter, noise).
- **`database/kanjium-accents.sqlite`**: Pre-compiled Kanjium pitch accent SQLite database.
- **`models/`**: Wav2Vec2 Japanese phoneme CTC and Silero VAD ONNX models.
- **`manifest.lock.json`**: Cryptographic SHA-256 manifest of all assets.

## Acoustic & Processing Standards

- **Sample Rate**: 16,000 Hz (Blackman-Harris windowed Sinc anti-aliased resampling)
- **Loudness**: -23.0 LUFS integrated loudness (ITU-R BS.1770 / EBU R128)
- **Format**: 16-bit Linear PCM Mono WAV
- **Companion Descriptors**: Full mora alignments, LPC vowel formants (F1-F3), and YIN/pYIN F0 pitch contours.

## Licensing & Attribution Register

This dataset is partitioned under multiple licenses per upstream authors:

| Asset / Partition | Provenance / Authors | Upstream License | Commercial Use |
| :--- | :--- | :--- | :--- |
| **JVS Corpus** (`corpora/jvs-certification-16k.tar.gz`) | Takaki, Kameoka, Yamagishi (NII) | `CC-BY-SA-4.0` | Permitted (with attribution) |
| **JSUT Corpus** (`corpora/jsut-certification-16k.tar.gz`) | Sonobe, Takamichi, Saruwatari (UTokyo) | `CC-BY-SA-4.0` | Permitted (with attribution) |
| **Kanjium SQLite** (`database/`) | Lars Yencken, mifunetoshiro, EDRDG | `CC-BY-SA-4.0` | Permitted (with attribution) |
| **Synthetic Fixtures** (`corpora/synthetic-adversarial.tar.gz`) | Voicevox / No.7 Project (小岩井ことり) | Custom Non-Commercial | **Restricted** (Requires paid contract) |

### Mandatory Attribution Notices

- **JVS**: Derived from the JVS Corpus (© 2019 National Institute of Informatics, Japan) by Shinnosuke Takaki, Hirokazu Kameoka, and Junichi Yamagishi, licensed under CC BY-SA 4.0.
- **JSUT**: Derived from the JSUT Corpus (© 2017 Saruwatari Lab, The University of Tokyo) by Ryosuke Sonobe, Shinnosuke Takamichi, and Hiroshi Saruwatari, licensed under CC BY-SA 4.0.
- **Kanjium**: Pitch accent data derived from the Kanjium project (© Lars Yencken, mifunetoshiro), built upon EDICT/JMdict dictionary files (© Electronic Dictionary Research and Development Group), licensed under CC BY-SA 4.0.
- **VOICEVOX No.7**: Synthetic test fixtures generated using VOICEVOX and Voice Library No.7. Credit: **VOICEVOX:No.7** (Voice Actor: Kotori Koiwai). Official Terms of Use: https://voiceseven.com/ and https://voicevox.hiroshiba.jp/. Non-commercial research and benchmarking use only. Commercial use requires a separate license from the No.7 Project.