Table 13: Quantitative statistics of the training datasets. The mean audio length is quoted in
seconds, and the mean transcription length in number of words.

Dataset
People’s Speech
Common Voice 13
GigaSpeech
Fisher
LibriSpeech
VoxPopuli
TED-LIUM
SwitchBoard
AMI
Total

Size / h
12,000
3,000
2,500
1,960
960
540
450
260
100
21,770

Speakers Mean Audio (s) Mean Text (words)
38.5
unknown
31.9
unknown
12.9
unknown
11,900
10.1
32.9
2,480
26.1
1,310
18.3
2,030
8.3
540
unknown
7.3
19.8
18,260+

13.8
5.6
4.0
3.3
12.1
10.3
6.1
4.8
2.6
7.1

20

Table 14: Qualitative statistics of the training datasets. The speaking styles are narrated (N),
oratory (O) or spontaneous (S), or a combination of them.

Style

Rec. Cond.
Close-talk mic. N, O, S CC-BY-SA-4.0
Close-talk mic. N

Licence

Domain
Internet Archive

Dataset
People’s Speech
Common Voice 13 Narrated Wikipedia
GigaSpeech
Fisher
LibriSpeech
VoxPopuli
TED-LIUM
SwitchBoard
AMI
DISTIL-WHISPER