What is G.711 codec

The G.711 codec algorithm defines rules for encoding/decoding non-compressed waves. The input data is derived from PCM data whose sampling frequency and bit rate are 8000 Hz and 64 kbit/s respectively. Based on the companding rate adopted for signal quantizing, the G.711 algorithm is classified into G.711 A and G.711 μ. The difference between the two lies in the fact that G.711 A uses a companding curve of 13-fold lines, whereas G.711 μ uses a companding curve of 15-fold lines.
The G.711 coder and decoder use a simple algorithm and compress signals by quantizing them in a nonlinear method, providing a short delay and high voice quality. However, the G.711 coder and decoder have a high data rate, which makes them sensitive to errors in transmission channels.
UMG8900 supports the G.711 voice codec mode and the switchover between G.711 A and G.711 μ, and can interwork with PSTN networks.

Scroll to top