Ultrax Speech Sound Disorders

A dataset of ultrasound and audio recordings from children with speech sound disorders


The UXSSD dataset contains 8 speakers (2 female and 6 male), aged 5-10 years.

The table below give further details for each speaker. Ages were taken in the first Assessment session and are indicated in years (AGE-Y) and months (AGE-M).

01M M 6 0 6.0
02M M 10 1 10.08
03F F 8 7 8.58
04M M 8 11 8.92
05M M 6 5 6.42
06M M 5 11 5.92
07F F 7 6 7.5
08M M 7 7 7.58


Session Description
BL Baseline session before therapy (1-2 sessions)
Mid Mid-point session, halfway through therapy
Post Post-therapy session, immediately after therapy ended
Maint Maintenance session, some time after therapy ended
Therapy Therapy sessions

Data Types

Core data types

Data type Description
wav speech waveform
ult raw ultrasound data
param ultrasound parameters
txt prompt text with date/time of utterance recording

Additional data

All labels are provided in Praat's TextGrid format.

Data type Description
slt-labels manual annotation from SLT, when available. See [2] for details
speaker-labels speaker diarization identifying therapist (SLT) and child (CHILD) speech
word-labels automatic word-level alignment
phone-labels automatic phone-level alignment

File IDs

Individual recordings are indexed for each session according to their recording times. See the prompt text file for recording date/time.

Each file ID also includes a prompt type identifier. See Data for details.

Additional Notes

Speaker 05M was subjected to two rounds of therapy, with corresponding Assessment sessions. These are identified as *_round2 in the speaker directory. Therapy sessions for this speaker are indexed chronologically.


[1] Eshky, A., Ribeiro, M. S., Cleland, J., Richmond, K., Roxburgh, Z., Scobbie, J., & Wrench, A. (2018) Ultrasuite: A repository of ultrasound and acoustic data from child speech therapy sessions. Proceedings of INTERSPEECH. Hyderabad, India.

[2] Cleland, J., Scobbie, J. M., & Wrench, A. A. (2015). Using ultrasound visual biofeedback to treat persistent primary speech sound disorders. Clinical linguistics & phonetics, 29(8-10), 575-597.