WorldSpeech

A multilingual ASR dataset containing 53k hours of transcribed speech across 113 language-region variants, drawn from national parliaments, public broadcasters, public-domain audiobooks, and international institutions (UN, ICC, Vatican Radio). Rows consist of 24 kHz speech utterances paired with a human-provided transcript, an aligned ASR transcript, character error rate (CER) between the two, a WADA-SNR estimate, and four DNSMOS-P.835 quality scores.

Dataset Overview

Metric	Value
Total hours	53,635
Distinct languages	79
Language variations	113
Languages ≥ 1,000 h	21
Languages ≥ 500 h	27
Languages ≥ 200 h	35
Languages ≥ 50 h	47
Avg DNSMOS-P.835 OVR	2.82
Sample rate	24 kHz

How to use

from datasets import load_dataset

ds = load_dataset("disco-eth/WorldSpeech", "nl_nl", split="train")

row = ds[0]
wav    = row["audio"]["array"]         
sr     = row["audio"]["sampling_rate"]
text   = row["human_transcript"]
snr    = row["snr"]
dnsmos = row["dnsmos_ovr"]

Streaming

from datasets import load_dataset

ds = load_dataset("disco-eth/WorldSpeech", "nl_nl", split="train", streaming=True)

for row in ds:
    wav = row["audio"]["array"]
    break

Schema

Field	Description
audio	OGG Opus decoded to {"array": np.float32[N], "sampling_rate": 24000}
human_transcript	Human-provided transcript
asr_transcript	ASR output used for alignment and CER computation
cer	Character error rate between asr_transcript and human_transcript
snr	WADA-SNR estimate, dB
dnsmos_sig	DNSMOS-P.835 signal quality
dnsmos_bak	DNSMOS-P.835 background noise
dnsmos_ovr	DNSMOS-P.835 overall MOS
dnsmos_p808	DNSMOS-P.808 MOS
duration	Segment duration in seconds
source	Source identifier (e.g. parliament_nl, librivox, voa_hausa)
source_url	URL to the original recording
source_start_s	Start offset within the source recording (seconds)
source_end_s	End offset within the source recording (seconds)
session_date	ISO-8601 date of the original recording
segment_id	Unique identifier for this segment
language	BCP-47 language tag
country	ISO 3166-1 alpha-2 country code (un / va for international)

Language Coverage

Config	Country	Language	Hours	DNSMOS OVR
af_za	South Africa	Afrikaans	20.2	2.79
am_et	Ethiopia	Amharic	39.6	3.11
am_hy	Armenia	Armenian	283.3	2.39
ar_bh	Bahrain	Arabic	219.5	2.72
ar_dz	Algeria	Arabic	92.9	2.66
ar_eg	Egypt	Arabic	22.0	2.86
ar_iq	Iraq	Arabic	291.9	2.94
ar_kw	Kuwait	Arabic	175.5	2.82
ar_ma	Morocco	Arabic	78.3	2.68
ar_sa	Saudi Arabia	Arabic	6.1	2.01
ar_tn	Tunisia	Arabic	50.9	2.74
ar_un	United Nations	Arabic	11.1	3.03
az_az	Azerbaijan	Azerbaijani	305.4	2.76
be_by	Belarus	Belarusian	24.2	3.10
bn_bd	Bangladesh	Bengali	46.1	3.03
ca_es	Spain	Catalan	168.7	2.99
ckb_iq	Iraq	Sorani Kurdish	35.3	2.93
cn_ug	China	Uyghur	200.0	2.86
cnr_me	Montenegro	Montenegrin	47.9	2.98
crs_sc	Seychelles	Kreol Seselwa	1,602.3	3.15
cs_cz	Czech Republic	Czech	2,689.5	2.87
de_at	Austria	German	1,077.5	2.93
dv_mv	Maldives	Dhivehi	20.0	2.92
el_cy	Cyprus	Greek	394.4	2.90
el_gr	Greece	Greek	35.9	3.37
en_au	Australia	English	568.4	3.02
en_jm	Jamaica	English	9.6	2.52
en_ke	Kenya	English	170.0	2.97
en_nz	New Zealand	English	435.7	2.68
en_sl	Sierra Leone	English	102.4	2.70
en_za	South Africa	English	142.9	2.95
en_zm	Zambia	English	291.6	2.70
eo	(international)	Esperanto	15.0	3.27
es_ar	Argentina	Spanish	251.7	2.78
es_cl	Chile	Spanish	1,740.5	2.94
es_co	Colombia	Spanish	156.8	2.75
es_es	Spain	Spanish	2,097.4	2.52
es_mx	Mexico	Spanish	901.6	2.63
es_pe	Peru	Spanish	387.4	2.63
es_pr	Puerto Rico	Spanish	228.6	2.73
es_py	Paraguay	Spanish	133.2	3.14
es_uy	Uruguay	Spanish	894.4	2.94
fa_ir	Iran	Persian	27.6	2.94
fr_ca	Canada	French	1,105.6	2.93
fr_cd	DR Congo	French	28.0	3.00
fr_ci	Côte d'Ivoire	French	11.9	2.97
ga_ie	Ireland	Irish	60.6	3.00
grc_gr	Greece	Ancient Greek	1.3	3.25
ha_ng	Nigeria	Hausa	54.9	2.88
ha_td	Chad	Hausa	71.5	2.87
he_il	Israel	Hebrew	41.8	3.21
hi_in	India	Hindi	1,608.8	2.66
hu_hu	Hungary	Hungarian	1,350.1	2.96
hy_am	Armenia	Armenian	1,138.9	2.59
id_id	Indonesia	Indonesian	94.1	2.95
ig_ng	Nigeria	Igbo	40.7	3.31
iu_ca	Canada	Inuktitut	33.8	2.81
ja_jp	Japan	Japanese	1,387.2	2.86
ka_ge	Georgia	Georgian	206.4	2.37
kh_km	Cambodia	Khmer	1,323.0	2.85
kk_kz	Kazakhstan	Kazakh	179.0	2.84
ko_kr	South Korea	Korean	1,278.9	3.08
la_lo	Laos	Lao	827.0	2.82
la_va	Vatican	Latin	34.8	3.37
lb_lu	Luxembourg	Luxembourgish	1,805.3	2.87
mfe_mu	Mauritius	Mauritian Creole	44.3	3.45
mi_nz	New Zealand	Māori	1.6	2.85
ml_in	India	Malayalam	3.3	2.37
mm_my	Myanmar	Burmese	865.0	2.88
mn_mn	Mongolia	Mongolian	181.0	2.80
mr_in	India	Marathi	0.8	2.75
ms_my	Malaysia	Malay	432.0	2.91
ne_np	Nepal	Nepali	58.0	2.79
nl_be	Belgium	Dutch (Flemish)	960.5	2.59
nl_nl	Netherlands	Dutch	3,692.6	3.00
nr_za	South Africa	Southern Ndebele	0.2	2.60
nso_za	South Africa	Northern Sotho	0.7	2.70
om_et	Ethiopia	Oromo	16.3	3.06
pa_in	India	Punjabi	3.3	2.54
pl_pl	Poland	Polish	2,731.9	2.70
pt_br	Brazil	Portuguese	1,763.5	2.68
rm_ch	Switzerland	Romansh	163.1	3.14
ro_md	Moldova	Romanian	1,059.5	2.66
ro_ro	Romania	Romanian	686.3	2.75
ru_by	Belarus	Russian	2.9	2.79
ru_ru	Russia	Russian	1,534.2	3.03
rw_rw	Rwanda	Kinyarwanda	17.6	2.63
rw_voa	Rwanda	Kinyarwanda (VOA)	14.5	2.77
si_lk	Sri Lanka	Sinhala	154.0	2.40
sm_ws	Samoa	Samoan	55.9	2.79
sn_zw	Zimbabwe	Shona	18.2	2.88
sq_al	Albania	Albanian	257.4	2.69
sq_xk	Kosovo	Albanian	176.6	2.69
ss_za	South Africa	Swati	0.1	2.84
st_za	South Africa	Sesotho	0.4	2.67
sv_ax	Åland Islands	Swedish	66.0	2.73
sw_tz	Tanzania	Swahili	710.4	2.56
ta_lk	Sri Lanka	Tamil	204.0	2.80
th_th	Thailand	Thai	845.3	3.18
ti_et	Ethiopia	Tigrinya	14.0	3.10
tl_ph	Philippines	Tagalog	219.0	2.88
tn_bw	Botswana	Tswana	49.7	2.88
tn_za	South Africa	Tswana	0.9	2.69
tr_tr	Turkey	Turkish	1,007.6	2.22
ts_za	South Africa	Tsonga	0.2	2.75
uz_uz	Uzbekistan	Uzbek	33.7	2.84
ve_za	South Africa	Venda	0.1	2.72
vn_vi	Vietnam	Vietnamese	726.0	2.90
xh_za	South Africa	Xhosa	10.1	2.74
yue_hk	Hong Kong	Cantonese	1,943.5	3.02
zh_tw	Taiwan	Mandarin	1,482.1	2.47
zu_za	South Africa	Zulu	19.0	2.71
Total	—	—	53,634.6	2.82

⚠️ Five configs (kh_km Khmer, la_lo Lao, mm_my Burmese, vn_vi Vietnamese, cn_ug Uyghur, sourced from Radio Free Asia include only metadata, transcripts, and source URLs. Audio must be downloaded separately from source_url.

Citation

Coming soon.

Dataset License

WorldSpeech is released under CC BY-NC 4.0. Individual source licenses apply per config and are listed in the Licenses section. Where a source license is more restrictive than CC BY-NC 4.0, the more restrictive terms govern that config.

Licenses

Config	Country / Language	License	Notes
af_za	South Africa / Afrikaans	Parliamentary Proceedings
am_et	Ethiopia / Amharic	Public Domain (17 USC §105)	US federal agency content (VOA).
ar_bh	Bahrain / Arabic	Parliamentary Proceedings
ar_dz	Algeria / Arabic	Parliamentary Proceedings
ar_eg	Egypt / Arabic	Parliamentary Proceedings
ar_iq	Iraq / Arabic	Parliamentary Proceedings
ar_kw	Kuwait / Arabic	Parliamentary Proceedings
ar_ma	Morocco / Arabic	Parliamentary Proceedings
ar_sa	Saudi Arabia / Arabic	Government Archive (Public Record)
ar_tn	Tunisia / Arabic	Parliamentary Proceedings
ar_un	United Nations / Arabic	UN Official Records	UN official records; non-commercial/research use per UN terms. Contact permissions@un.org for commercial use.
az_az	Azerbaijan / Azerbaijani	Public Domain (17 USC §105)	US federal agency content (VOA).
be_by	Belarus / Belarusian	CC BY-NC-SA 4.0
bn_bd	Bangladesh / Bengali	Public Domain (17 USC §105)	US federal agency content (VOA).
ckb_iq	Iraq / Sorani Kurdish	Parliamentary Proceedings
cnr_me	Montenegro / Montenegrin	Parliamentary Proceedings
crs_sc	Seychelles / Kreol Seselwa	Parliamentary Proceedings
cs_cz	Czech Republic / Czech	Parliamentary Proceedings
de_at	Austria / German	Parliamentary Proceedings
dv_mv	Maldives / Dhivehi	Parliamentary Proceedings
el_cy	Cyprus / Greek	Parliamentary Proceedings
el_gr	Greece / Greek	Parliamentary Proceedings
en_au	Australia / English	Parliamentary Proceedings
en_jm	Jamaica / English	Parliamentary Proceedings
en_ke	Kenya / English	Parliamentary Proceedings
en_nz	New Zealand / English	Parliamentary Proceedings
en_sl	Sierra Leone / English	Parliamentary Proceedings
en_zm	Zambia / English	Parliamentary Proceedings
eo	(international) / Esperanto	CC0 1.0 (Public Domain)
es_ar	Argentina / Spanish	Parliamentary Proceedings
es_cl	Chile / Spanish	Parliamentary Proceedings
es_co	Colombia / Spanish	Parliamentary Proceedings
es_es	Spain / Spanish	Parliamentary Proceedings
es_mx	Mexico / Spanish	Parliamentary Proceedings
es_pe	Peru / Spanish	Parliamentary Proceedings
es_pr	Puerto Rico / Spanish	Parliamentary Proceedings
es_py	Paraguay / Spanish	Parliamentary Proceedings
es_uy	Uruguay / Spanish	Parliamentary Proceedings
fa_ir	Iran / Persian	Public Domain (17 USC §105)	US federal agency content (VOA).
fr_ca	Canada / French	Parliamentary Proceedings
fr_cd	DR Congo / French	ICC Court Records	Public judicial proceedings of an international court; non-commercial/educational use per ICC terms.
fr_ci	Cote d'Ivoire / French	ICC Court Records	Public judicial proceedings of an international court; non-commercial/educational use per ICC terms.
ga_ie	Ireland / Irish	CC BY 4.0 (Oireachtas PSI Licence)
grc_gr	Greece / Ancient Greek	CC0 1.0 (Public Domain)
ha_ng	Nigeria / Hausa	Public Domain (17 USC §105)	US federal agency content (VOA).
ha_td	Chad	Public Domain (17 USC §105)	US federal agency content (VOA).
he_il	Israel / Hebrew	CC0 1.0 (Public Domain)	LibriVox recordings (CC0) + Ben-Yehuda Project texts (public domain per Israeli copyright law).
hi_in	India / Hindi	Parliamentary Proceedings
hu_hu	Hungary / Hungarian	Parliamentary Proceedings
hy_am	Armenia / Armenian	Parliamentary Proceedings
id_id	Indonesia / Indonesian	Public Domain (17 USC §105)	US federal agency content (VOA).
ig_ng	Nigeria / Igbo	Public Domain (17 USC §105)	US federal agency content (VOA).
iu_ca	Canada / Inuktitut	Parliamentary Proceedings
ja_jp	Japan / Japanese	CC0 1.0 (Public Domain)	LibriVox recordings (CC0) + Aozora Bunko texts (public domain, 50yr Japanese law).
ka_ge	Georgia / Georgian	Parliamentary Proceedings
kk_kz	Kazakhstan / Kazakh	Parliamentary Proceedings
kh_km	Cambodia / Khmer	RFA Terms of Use (non-commercial)	Metadata only — audio not embedded. Download audio from source_url. Non-commercial research use; see RFA terms.
ko_kr	South Korea / Korean	Parliamentary Proceedings
la_va	Vatican / Latin	Vatican Radio Archive	Vatican Radio historical archive; contact Vatican Media for commercial use.
lb_lu	Luxembourg / Luxembourgish	Parliamentary Proceedings
la_lo	Laos / Lao	RFA Terms of Use (non-commercial)	Metadata only — audio not embedded. Download audio from source_url. Non-commercial research use; see RFA terms.
mfe_mu	Mauritius / Mauritian Creole	Parliamentary Proceedings
mi_nz	New Zealand / Maori	Parliamentary Proceedings
ml_in	India / Malayalam	Parliamentary Proceedings
mn_mn	Mongolia / Mongolian	Parliamentary Proceedings / CC0	Parliament sessions (public record) + Latter-day Saints addresses (CC0 per lds.org).
mr_in	India / Marathi	Parliamentary Proceedings
ms_my	Malaysia / Malay	Parliamentary Proceedings
mm_my	Myanmar / Burmese	RFA Terms of Use (non-commercial)	Metadata only — audio not embedded. Download audio from source_url. Non-commercial research use; see RFA terms.
ne_np	Nepal / Nepali	Parliamentary Proceedings
nl_be	Belgium / Dutch	Parliamentary Proceedings
nl_nl	Netherlands / Dutch	Parliamentary Proceedings
nr_za	South Africa / Southern Ndebele	Parliamentary Proceedings
nso_za	South Africa / Northern Sotho	Parliamentary Proceedings
om_et	Ethiopia / Oromo	Public Domain (17 USC §105)	US federal agency content (VOA).
pa_in	India / Punjabi	Parliamentary Proceedings
pl_pl	Poland / Polish	Parliamentary Proceedings
pt_br	Brazil / Portuguese	Parliamentary Proceedings
rm_ch	Switzerland / Romansh	SRG SSR Terms of Use	Corpus compiled from publicly broadcast RTR programming; contact SRG SSR for commercial use.
ro_md	Moldova / Romanian	Parliamentary Proceedings
ro_ro	Romania / Romanian	Parliamentary Proceedings
ru_by	Belarus / Russian	Government Publication (Public Record)
ru_ru	Russia / Russian	Parliamentary Proceedings
rw_rw	Rwanda / Kinyarwanda	Parliamentary Proceedings
si_lk	Sri Lanka / Sinhala	Parliamentary Proceedings
sm_ws	Samoa / Samoan	Parliamentary Proceedings
sn_zw	Zimbabwe / Shona	Public Domain (17 USC §105)	US federal agency content (VOA).
sq_al	Albania / Albanian	Parliamentary Proceedings
sq_xk	Kosovo / Albanian	Parliamentary Proceedings
ss_za	South Africa / Swati	Parliamentary Proceedings
st_za	South Africa / Sesotho	Parliamentary Proceedings
sv_ax	Aland Islands / Swedish	Parliamentary Proceedings
sw_tz	Tanzania / Swahili	Parliamentary Proceedings
ta_lk	Sri Lanka / Tamil	Parliamentary Proceedings
th_th	Thailand / Thai	Parliamentary Proceedings
ti_et	Ethiopia / Tigrinya	Public Domain (17 USC §105)	US federal agency content (VOA).
tl_ph	Philippines / Tagalog	Parliamentary Proceedings
tn_bw	Botswana / Tswana	Parliamentary Proceedings
tn_za	South Africa / Tswana	Parliamentary Proceedings
tr_tr	Turkey / Turkish	Parliamentary Proceedings
ts_za	South Africa / Tsonga	Parliamentary Proceedings
cn_ug	China / Uyghur	RFA Terms of Use (non-commercial)	Metadata only — audio not embedded. Download audio from source_url. Non-commercial research use; see RFA terms.
uz_uz	Uzbekistan / Uzbek	RFE/RL Terms of Use (non-commercial)	US government-funded broadcaster; non-commercial research use. Original Ozodlik (RFE/RL Uzbek) content.
ve_za	South Africa / Venda	Parliamentary Proceedings
vn_vi	Vietnam / Vietnamese	RFA Terms of Use (non-commercial)	Metadata only — audio not embedded. Download audio from source_url. Non-commercial research use; see RFA terms.
xh_za	South Africa / Xhosa	Parliamentary Proceedings
yue_hk	Hong Kong / Cantonese	Parliamentary Proceedings
zh_tw	Taiwan / Chinese (Mandarin)	Parliamentary Proceedings
zu_za	South Africa / Zulu	Parliamentary Proceedings