Objective analysis of the GSM half rate speech codec candidates. - Friedhelm Wuppermann; Christiane Antweiler; M. Kappelan (EUROSPEECH, 1993)

Acoustic front ends for speaker-independent digit recognition in car environments. - Detlev Langmann; Alexander Fischer; Friedhelm Wuppermann; Reinhold Haeb-Umbach; Thomas Eisele (EUROSPEECH, 1997)