Common Voice Spontaneous Speech 1.0 - English

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License:

CC0-1.0

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Steward:

Common Voice

Task: ASR

Release Date: 11/27/2025

Format: MP3

Size: 128.69 MB

Description

A collection of spontaneous spoken phrases in English.

Specifics

Licensing

Creative Commons Zero v1.0 Universal (CC0-1.0)

https://spdx.org/licenses/CC0-1.0.html

Considerations

Restrictions/Special Constraints

You agree that you will not re-host or re-share this dataset

Forbidden Usage

You agree not to attempt to determine the identity of speakers in the Common Voice dataset

Processes

Intended Use

This dataset is intended to be used for training and evaluating automatic speech recognition (ASR) models. It may also be used for applications relating to computer-aided language learning (CALL) and language or heritage revitalisation.

Metadata

English — English (en)

This datasheet is for version 1.0 of the the Mozilla Common Voice Spontaneous Speech dataset for English (en). The dataset contains 9 hours of recorded speech (2 hours validated) from 148 speakers.

Language

English is a West Germanic language with origins in England. There are an estimated 1.5 billion English speakers, making it the most widely spoken language in the world. English is commonly learned as a second language in many countries.

Writing system

The English writing system is based off of the latin alphabet.

Symbol table

a b c d e f g h i j k l m n o p q r s t u v w x y z

Fields

Each row of a tsv file represents a single audio clip, and contains the following information:

  • client_id - hashed UUID of a given user

  • audio_id - numeric id for audio file

  • audio_file - audio file name

  • duration_ms - duration of audio in milliseconds

  • prompt_id - numeric id for prompt

  • prompt - question for user

  • transcription - transcription of the audio response

  • votes - number of people that who approved a given transcript

  • age - age of the speaker1

  • gender - gender of the speaker1

  • language - language name

  • split - for data modelling, which subset of the data does this clip pertain to

  • char_per_sec - how many characters of transcription per second of audio

  • quality_tags - some automated assessment of the transcription--audio pair, separated by |

    • transcription-length - character per second under 3 characters per second

    • speech-rate - characters per second over 30 characters per second

    • short-audio - audio length under 2 seconds

    • long-audio - audio length over 30 seconds

    • non-allowed-script - Tag for transcriptions containing a writing system non associated with the language.

    • mixed-script-words - ag for transcriptions containing multiple writing systems at the word/token level.

    • mixed-script-transcription - Tag for transcriptions containing multiple writing systems, but each word/token consistently uses a single script

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Footnotes

  1. For a full list of age, gender, and accent options, see the demographics spec. These will only be reported if the speaker opted in to provide that information. ↩ ↩2