HUT Communications Lab. / Timo O. Korhonen
5
A voice coder classification
nWaveform coders (as PCM) describe
the signal by numbered values, very precise operation but requires many
bitsnVoice coders parameterize speech by counting on a system model that
produces the signal. Only model parameters are transmitted and updated. Very low
rate can be obtained but quality may suffer
nHybrid
coder is a compromise used for instance in PLMN apps
