1. 3GPP TS 26.071, Mandatory speech codec speech processing functions; AMR speech Codec; General description. 3GPP, Sophia Antipolis Valbonne (1999)
2. 3GPP TS 26.171, Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; General description. 3GPP, Sophia Antipolis Valbonne (2001)
3. 3GPP TS 26.441, Codec for enhanced voice services (EVS); General overview. 3GPP, Sophia Antipolis Valbonne (2014)
4. S. Amiriparian, M. Gerczuk, S. Ottl, N. Cummins, M. Freitag, S. Pugachevskiy, A. Baird, B. Schuller, Snore sound classification using image-based deep spectrum features, in Proceedings of Interspeech 2017, Stockholm (2017)
5. J. Berger, A. Hellenbart, R. Ullmann, B. Weiss, S. Möller, J. Gustafsson, G. Heikkilä, Estimation of ‘quality per call’ in modelled telephone conversations, in Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Las Vegas (2008)