1. Pulse code modulation (PCM) of voice frequencies;ITU-T Recommendation G.711,1988
2. A high quality low-complexity algorithm for packet loss concealment with G.711;ITU-T Recommendation G.711,1999
3. Coding of speech at 16 kbit/s using low-delay code excited linear prediction;ITU-T Recommendation G.728,1992
4. Coding of speech at 8 kbit/s using conjugate-structure algebraic-code-excited linear prediction (CS-ACELP);ITU-T Recommendation G.728,1996
5. Low-complexity coding at 24 and 32 kbit/s for hands-free operation in systems with low frame loss;ITU-T Recommendation G.722.1,2005