A technique is proposed to accurately estimate the Network CODEC levels for each PCM code a server modem generates. These levels are affected by the digital impairments such as Digital attenuation PAD in the trunk, the Robbed Bit Signaling, the type of CODEC (μ-law or a-law—or non standard), and by...http://www.google.fr/patents/US7339996?utm_source=gb-gplus-shareBrevet US7339996 - Receiver codec super set constellation generator
