CUCall is a systematic collection of Cantonese/Putonghua speech data over the telephone networks. They are intended to assist the development of telephone based speech recognition systems. The data were collected from telephone calls of over 1,000 speakers through fixed-line or various types of mobile networks. The total amount of data is about 190 hours. Transcriptions are provided in the forms of Chinese characters and phonemic symbols.

CUCall is divided into the following parts:

  • Sentences - continuous Cantonese sentences
  • Digits - Continuous Cantonese digit strings of various lengths
  • Words - Cantonese phrases from various domains
  • Sentence and Paragraph - continuous Cantonese short sentences and paragraphs
  • Spontaneous speech - spontaneous Cantonese answers to questions
  • Mandarin words, sentences, and spontaneous speech - Mandarin words and sentences covering travel and financial domains. There are also spontaneous Mandarin answers to questions.

More information about CUCall can be found from:


The followings are some samples of CUCall for preview purpose. Just download and see if they meet your requirements. By downloading these files, you acknowledge that the copyright of of the data belongs to CUHK and agree the downloaded data will solely be used for preview purpose.

cxsearch is a tool for locating files in CUCorpora from the accompanying transcription files. It accepts regular expression as search pattern. For detail, see the readme file.

You may download cxsearch here.


The corpora of CUCall is now available for licensing. Click here for prices. Industrial parties may license it for developing commercial products or internal research purpose. For research and educational purpose at academic institutions, a discounted special package is available.

The following materials are required for the processing of your request for licensing:

  1. TWO signed copies of the appropriate types of end user license agreements
  2. A bank draft in Hong Kong Dollar made payable to The Chinese University of Hong Kong for the license fee. Other methods of payment, e.g., bank transfer, credit card, are also acceptable. For details contact Ms. Tracy PANG (, Technology Development Team, Office of Research and Knowledge Transfer Services (ORKTS), CUHK.
  3. Your contact information, including mailing address for the requested materials.
  4. Send these documents to
    Prof. Tan Lee
    Department of Electronic Engineering,
    Room 404, Ho Sin Hang Engineering Building
    The Chinese University of Hong Kong,
    Shatin, New Territories


Prof. Tan Lee
Department of Electronic Engineering, The Chinese University of Hong Kong,
Tel: (852) 39438267
Fax: (852) 26035558