Dr.-Ing. Christian Hacker   Dr.-Ing. Christian Hacker

-Assessment of non-native speakers
-Children's Speech
-Focus of Attention
-User States
-Speech Recognition


Cildren's speech

Speech recognition

Many speech recognizers fail recognizing speech from children. One of the reasons is shown in the following figure. It illustrates the first and second formant for different English vowels. The formants are plotted for American English (top left: children of age 8-10, buttom left: adults) and British English (top right: children of age 4-14). Buttom rights shows German children learning English (beginners, age 10-14).
Children's speech: Formats

Further information can be found in:

Hacker, Christian Automatic Assessment of Children Speech to Support Language Learning Berlin: Logos Verlag, 2009

Maier, Andreas; Hönig, Florian; Hacker, Christian; Schuster, Maria; Nöth,Elmar Automatic Evaluation of Characteristic Speech Disorders in Children with Cleft Lip and Palate In: Interspeech (Eds.) Interspeech 2008 (Nineth Annual Conference of the International Speech Communication Association Brisbane 22.- 26.9.2008) Vol. 1 Brisbane : International Speech Communication Association 2008, pp. 1757-1760

Batliner, Anton; Hacker, Christian; Steidl, Stefan; Nöth, Elmar; D'Arcy, S.; Russell, M.; Wong, M. "You stupid tin box" - children interacting with the AIBO robot: A cross-linguistic emotional speech corpus. In: ELRA (Eds.) Proceedings of the 4th International Conference of Language Resources and Evaluation LREC 2004 (LREC Lisbon 2004, pp. 171?174

Emotional speech

To analyse emotional speech of young speakers (age 7-12) we recorded children playing with the Aibo robot. For further information, see here