The 2nd Clarity Prediction Challenge

New approaches for speech intelligibility estimation

Launching 1st March 2023


430 million people worldwide require rehabilitation to address hearing loss (World Health Organization). Yet even in developed countries, only 40% of people who could benefit from hearing aids have them and use them often enough. People believe that hearing aids perform poorly, with the difficulties of hearing speech-in-noise being a key issue.


Speech intelligibility prediction is an active area of research which allows developers and researchers to work on speech enhancement algorithms without relying on slow and expensive human listening tests at every stage of development. The Clarity Prediction Challenges (CPC) aim to encourage the development of new prediction systems which can improve on existing methods.

The Challenge

To allow the development of better hearing aids, we need ways to evaluate the speech intelligibility of audio signals automatically. We need a prediction model that takes the audio produced by a hearing aid and the listener's characteristics (e.g. audiogram) and estimates the speech intelligibility score that the listener would achieve in a listening test.

For the prediction challenge we will provide the following data:

  • Audio produced by a variety of (simulated) hearing aids for speech-in-noise
  • The corresponding clean reference signals (the original speech)
  • Characteristics of the listeners (pure tone audiogram, etc.)
  • The measured speech intelligibility scores from listening tests, where the listener was asked to say what they heard for the speech-in-noise.

Sign up to the Clarity Challenges Google group to receive updates on this challenge.

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Important Dates

  • Sign-up available Jan 2023
  • Challenge Launch, 1st March 2023,
  • Submission window, July 1st to 31st 2023
  • Presentation of submitted papers at an Interspeech satellite workshop 19th Aug 2023 (details TBD)


Entrants will be asked to submit their predictions and an accompanying technical report describing their approach. Details to be announced when the challenge launches.


  • Michael Akeroyd, University of Nottingham
  • Will Bailey, University of Sheffield
  • Jon Barker, University of Sheffield
  • Trevor Cox, University of Salford
  • John Culling, Cardiff University
  • Simone Graetzer,University of Salford
  • Graham Naylor, University of Nottingham
  • Zehai Tu, University of Sheffield


If you have any questions regarding the session please don't hesitate to contact the organizers using the email below:


Clarity is funded by the Engineering and Physical Sciences Research Council (EPSRC), UK. Project partners are Royal National Institute for the Deaf, Hearing Industry Research Consortium, and Amazon TTS Research.