Patent ID: 6721363
Filing Date: 2004-04-13
Classification: H04L

Abstract:
A method for generating multiple unique real non-linear constellations each representing different time slots corresponding to a set of network CODEC linear output levels for each digital PCM code from the server modem, said method comprising:receiving, in an analog modem, the linear output of a network CODEC converted from PCM coded data transmitted by a network server modem, the linear data comprising a number of data points in a predetermined number of slots, averaging, in the analog modem, the linear data, for each digital PCM code, for each of the time slots, to generate a statistical estimate of the linear data corresponding to the real non-linear constellation points to produce estimated real non-linear constellation points, converting, using a first converting algorithm, to map the estimated real non-linear constellation points to the network CODEC linear output levels, matching, in the analog modem, for selecting closest ideal CODEC output levels for a selected type of network CODEC, and converting, using an inverse of the first converting algorithm, to re-map the closest ideal CODEC output levels back to real non-linear constellation points.