US English Conversational Speech Dataset
1,500 hours of spontaneous two-person conversations in US English, recorded in the United States with 150 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 US English samples.
Specifications
| Language | US English |
| Recorded in | United States |
| Speech type | Spontaneous two-person conversations |
| Volume | 1,500 hours |
| Speakers | 150 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 | $90 per hour of audio, volume and multi-language discounts on request |
What makes US English hard for speech recognition
US English varies more than most models expect. Southern, New York, Midwestern and African American English differ in vowels, rhythm and grammar, and casual speech is full of reductions like "gonna" and "wanna". Models trained mostly on read or broadcast audio lose accuracy on exactly these features in real conversations.
Built for
- Automatic speech recognition (ASR / STT)
- Text-to-speech and voice synthesis prosody
- Voice agents and IVR for the United States
- Speaker diarization and turn-taking models
- Speech LLM and audio-understanding fine-tuning
Getting the data
Request samples with a company email on the English (US) 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.
Need something else?
- Call center speech data for call-center style recordings.
- Audio annotation services to transcribe or annotate audio you already have.
- Speech data pricing with published per-hour prices.
Related datasets
Other English datasets from SpeechDataAI on Hugging Face: South African English, Singapore English.
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.
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