This Chinese Mandarin Speech Recognition database was collected in China and contains the voices of 100 different native speakers who were demographic balanced according to age distribution (12–18,19–30,31–50), Gender (53males, 47 females), from four Regions of Shanghai, Guangzhou, Xiamen, Chongqing. It include 4000 audio files and about 5.62 hours.
Each speaker uttered 40 sentences in a quiet office room through recording system on a telephone by dialing the phone.

The database was made for the tuning and testing purpose of speech recognition systems for speech ASR applications.