1950 speakers participated in the recording, and conducted face-to-face communication in a natural way. They had free discussion on a number of given topics, with a wide range of fields. The voice was natural and fluent, in line with the actual dialogue scene. Text is transcribed manually, with high accuracy. Format：Mobile phone: 16kHz, 16bit, mono channel, .wav; Voice recorder: 44.1kHz, 16bit, dual channel, .wav Recording Environment：quiet indoor environment, without echo Recording content：dozens of topics are specified, and the speakers make dialogue under those topics while the recording is performed Demographics：1,950 people; 66% speakers of all are in the age group of 16-25; 962 speakers of them spoke in groups of two speakers, 312 speakers of them spoke in groups of three speakers, 396 speakers of them spoke in groups of four speakers, and the other 280 speakers spoke in groups of five speakers Annotation：annotating for the transcription text, speaker identification and gender Device：mobile phone and voice recorder Language：Mandarin Application scenarios：speech recognition; voiceprint recognition Accuracy rate：97%

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ELRA

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