The Mandarin Chinese Speecon database is divided into 2 sets:
1) The first set comprises the recordings of 550 adult Chinese speakers (276 males, 274 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 Chinese speakers (26 boys, 24 girls), recorded over 4 microphone channels in 1 recording environment (children room).
This database is partitioned into 26 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:
6 noise recordings
The “silence word” recording
Free spontaneous items (adults only):
2 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 name, 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
1 isolated digit sequence
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 and 48 general commands (children)
The following age distribution has been obtained:
Adults: 224 speakers are between 15 and 30, 220 speakers are between 31 and 45, 106 speakers are between 46 and 60.
Children: 17 speakers are between 8 and 10, 33 speakers are between 11 and 14.
A pronunciation lexicon with a phonemic transcription in SAMPA is also included.