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  • Download link:Google Drive
  • Contact: - The subject must start with the tag [TCDVoIP Question] (If the tag is not provided or invalid, your email will be ignored)
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  • Reference:
  title        = {TCD-VoIP, a research database of degraded speech for assessing quality in VoIP
  author       = {Harte, Naomi and Gillen, Eoin and Hines, Andrew},
  booktitle    = {2015 Seventh International Workshop on Quality of Multimedia Experience (QoMEX)},
  pages        = {1--6},
  year         = {2015},
  organization = {IEEE}


There are many types of degradation which can occur in Voice over IP calls. Degradations which occur independently of the codec, hardware, or network in use are the focus of this dataset. The development of new quality metrics for modern communication systems depends heavily on the availability of suitable test and development data with subjective quality scores. A new dataset of VoIP degradations (TCD-VoIP) has been created and is available here. The dataset contains speech samples with a range of common VoIP degradations, and the corresponding set of subjective opinion scores from 24 listeners.

Summary of Degradations and Parameters used in TCD-VoIP

Degradation Conditions Parameters Range
Chop 20 Rate 0-6 chops/s
    Period 0.02-0.04 s
    Mode Insert, Delete, Overwrite
Clip 10 Multiplier 1-55
Competing Speaker 10 Gender Coder 1-5
    SNR 10-50 dB
Echo 20   0-0.5
      0-220 ms
Noise 20 Noise Type Car, Street, Office, Babble
    SNR 5-55dB
MNRU 4 SNR (Q) 48, 36, 24, 12