Japanese Conversational Speech Dataset
500 hours of spontaneous two-person conversations in Japanese, recorded in Japan with 50 vetted native speakers. Dual-channel audio, time-aligned human-verified transcripts and speaker metadata, licensed for commercial ASR, TTS and voice AI training.
This repository is the dataset card only. The audio is licensed commercially and isn't hosted on Hugging Face. Free samples (audio, matching transcripts and the metadata schema) are sent on request: request Japanese samples.
Specifications
| Language | Japanese |
| Recorded in | Japan |
| Speech type | Spontaneous two-person conversations |
| Volume | 500 hours |
| Speakers | 50 vetted native speakers |
| Audio | Dual-channel, one channel per speaker |
| Transcripts | Time-aligned, human-verified |
| Speaker metadata | Age, gender, region, recording device |
| Consent | Signed commercial-use consent from every speaker |
| License | Commercial, for training and evaluation |
| Price | $95 per hour of audio, volume discounts available |
What makes Japanese hard for speech recognition
Japanese is written with three scripts and no spaces, so transcripts need clear rules for kanji, kana and word boundaries before accuracy can be measured. Pitch accent, many homophones and the shift between polite and casual speech make conversation very different from read text.
Built for
- Automatic speech recognition (ASR / STT)
- Text-to-speech and voice synthesis prosody
- Voice agents and IVR for Japan
- Speaker diarization and turn-taking models
- Speech LLM and audio-understanding fine-tuning
Getting the data
Request samples with a company email on the Japanese dataset page and the team replies with representative audio and transcripts so you can check quality, accents and transcript conventions before you buy. Need more hours, another dialect or your own recording setup? SpeechData.ai also collects speech data to spec, or you can book a call.
About SpeechData.ai
SpeechData.ai licenses conversational speech datasets in 60 languages and dialects and runs custom speech data collection. It's part of Spirelight. Browse the full catalog.
- Downloads last month
- 25