The Czech Speecon database is divided into 2 sets:
1) The first set comprises the recordings of 550 adult Czech speakers (275 males, 275 females), recorded over 4 microphone channels in 4 recording environments (office, entertainment, car, public place).
2) The second set comprises the recordings of 50 child Czech speakers (18 boys, 32 girls), recorded over 4 microphone channels in 1 recording environment (children room).
This database is partitioned into 20 DVDs (first set) and 3 DVDs (second set).
The speech databases made within the Speecon project were validated by SPEX, the Netherlands, to assess their compliance with the Speecon format and content specifications. Each of the four speech channels is recorded at 16 kHz, 16 bit, uncompressed unsigned integers in Intel format (lo-hi byte order). To each signal file corresponds an ASCII SAM label file which contains the relevant descriptive information.
Each speaker uttered the following items (over 290 items for adults and over 210 items for children):
6 noise recordings
The “silence word” recording
Free spontaneous items (adults only):
5 minutes (session time) of free spontaneous, rich context items (story telling) (an open number of spontaneous topics out of a set of 30 topics)
17 Elicited spontaneous items (adults only):
3 dates, 2 times, 3 proper names, 2 city names, 1 letter sequence, 2 answers to questions, 3 telephone numbers, 1 language
30 phonetically rich sentences uttered by adults and 60 uttered by children
5 phonetically rich words (adults only)
4 isolated digits
2 isolated digit sequences
4 connected digit sequences
1 telephone number
3 natural numbers
1 money amount
2 time phrases (T1 : analogue, T2 : digital)
3 dates (D1 : analogue, D2 : relative and general date, D3 : digital)
3 letter sequences
1 proper name
2 city or street names
2 special keyboard characters
1 Web address
1 email address
208 application specific words and phrases per session (adults)
74 toy commands, 14 phone commands and 34 general commands (children)
The following age distribution has been obtained:
Adults: 263 speakers are between 15 and 30, 189 speakers are between 31 and 45, 98 speakers are over 46.
Children: 22 speakers are between 8 and 10, and 28 speakers are between 11 and 15.
A pronunciation lexicon with a phonemic transcription in SAMPA is also included.