Common Voice Scripted Speech 25.0 - Latvian

Latviešu — Latvian (lv)

This datasheet is for cv-corpus-25.0-2026-03-09 of the Mozilla Common Voice Scripted Speech dataset for Latvian [Latviešu - lv]. The dataset contains 231784 clips representing 309.67 hours of recorded speech (265.39 hours validated) from 6548 speakers, recorded from a text corpus of 99,607 sentences.

Language

Latvian is an Baltic language belonging to the Indo-European language family. It is spoken in the Baltic region, and is the official language of Latvia as well as one of the official languages of the European Union. There are about 1.5 million native Latvian speakers in Latvia and 100,000 abroad. It uses the Latin alphabet with additional diacritical marks to represent specific sounds.

Variants

There are slight stylistic speach variations among different regions of Latvia, but they do not affect mutual intelligibility. Latgale region has more significant differences with main Latvian language. It is sometimes considered a dialect, but Latgalian (ltg) speech is collected as a separate language in Common Voice.

Accents

Demographic information

The dataset includes the following self-declared age and gender distributions. A coverage summary is shown below each table.

Gender

Self-declared gender information. The table shows clip and speaker counts with percentages. Speakers who did not declare a gender are listed as Unspecified. A dash (-) indicates zero.

Gender declared: 127,356 of 231,784 clips (54.9%), 332 of 6,548 speakers (5.1%)

Age

Self-declared age information. The table shows clip and speaker counts with percentages. Speakers who did not declare an age are listed as Unspecified. A dash (-) indicates zero.

Age declared: 128,973 of 231,784 clips (55.6%), 351 of 6,548 speakers (5.4%)

Data splits for modelling

Clip buckets

Training splits

Training split coverage: 30,422 of 198,641 validated clips (15.3%)

The dataset contains 198641 validated, 11635 invalidated, and 21508 unresolved clips. The average clip duration is 4.81 seconds.

Text corpus

Validated sentences: 34,635

The corpus contains 99,607 sentences: 34,635 validated and 64,972 unvalidated (62,983 pending review, 1,989 rejected), with 3,107 reported for review.

Writing system

Latvian alphabet is based on the Latin script and consists of 33 letters, including special characters with diacritical marks such as ā, č, ē, ģ, ī, ķ, ļ, ņ, š, ū, and ž.

Historic texts also used letter /ŗ/, but use of it has been officially discontinued since 1946. This letter is equivalent to letter /r/ in modern Latvian orthography.

Letter /o/ can represent three different sounds [ua̯], [ɔ], [ɔː].

Letter /e/ can represent two different sounds [e], [æ].

Symbol table

a ā b c č d e ē f g ģ h i ī j k ķ l ļ m n ņ o p r s š t u ū v z ž

Sample

There follows a randomly selected sample of five sentences from the corpus.

1. Taču tas nenozīmē, ka tā mums jāatdod uz mūžīgiem laikiem.

2. Es gluži tā neteiktu.

3. Ieviņa īstenībā nav tāda, kā viņa līdz šim gražojās ar vārdiem.

4. Un vai tādēļ mēs tagad lieksimies citu valstu priekšā?

5. Mēs jau esam atraduši naudu un mēģinām izveidot programmas struktūru.

Sources

Text sources in the dataset consists of user added content as well as balanced sets of samples from Wikipedia, European parliament transcripts, out of copyright books and other sources.

Text domains

Recommended post-processing

• Filter out clips with /ŗ/

• Filter out clips with characters not in the Latvian alphabet

Fields

Clips

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

• client_id - hashed UUID of a given user

• path - relative path of the audio file

• text - supposed transcription of the audio

• up_votes - number of people who said audio matches the text

• down_votes - number of people who said audio does not match text

• age - age of the speaker1

• gender - gender of the speaker1

• accents - accents of the speaker1

• variant - variant of the language1

• segment - if sentence belongs to a custom dataset segment, it will be listed here

• prompt_upvotes - number of upvotes the sentence prompt received

• prompt_reports - number of reports the sentence prompt received

• is_edited - whether the clip's transcription has been edited

validated_sentences.tsv

The validated_sentences.tsv file contains one row per validated sentence in the text corpus:

• sentence_id - unique identifier for the sentence

• sentence - the sentence text

• variant - the variant of the language

• sentence_domain - the domain(s) the sentence belongs to

• source - the source the sentence was collected from

• is_used - whether the sentence is still in circulation for recording

• clips_count - number of clips recorded for this sentence

unvalidated_sentences.tsv

The unvalidated_sentences.tsv file contains one row per unvalidated sentence in the text corpus:

• sentence_id - unique identifier for the sentence

• sentence - the sentence text

• variant - the variant of the language

• sentence_domain - the domain(s) the sentence belongs to

• source - the source the sentence was collected from

• up_votes - number of upvotes the sentence received

• down_votes - number of downvotes the sentence received

• status - current status of the sentence (pending or rejected)

Get involved

Community links

• Balsu talka

• Common Voice translators on Pontoon

• Common Voice Communities

Discussions

• Common Voice on Matrix

• Common Voice on Discourse

• Common Voice on Discord

• Common Voice on Telegram

Contribute

• Speak

• Write

• Listen

• Review

Acknowledgements

Datasheet authors

Raivis Dejus

Licence

This dataset is released under the Creative Commons Zero (CC-0) licence. By downloading this data you agree to not determine the identity of speakers in the dataset.

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 ↩3 ↩4