System and method for dynamically optimizing a symbol table and

Coded data generation or conversion – Digital code to digital code converters – Coding by table look-up techniques

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375222, H03M 300

Patent

active

058315616

ABSTRACT:
For use with an analog communications device coupled to an analog interface of a digital telecommunications network, the analog interface having signal conversion values corresponding to an n-level symbol table, a system and method that dynamically selects a constellation of symbols from the n-level symbol table, and a modulator/demodulator ("modem") employing the system or the method. The system includes (1)a logic circuit that selects m symbols, m being less than or equal to n, from the n-level symbol table, the m symbols being a function of the signal conversion values, and (2) a transmission circuit adapted to transmit data identifying the m symbols to a remote device digitally-coupled to the digital telecommunications network, the data allowing the analog communications device and the remote device to communicate with a common symbol table dynamically adapted to the signal conversion values of the analog interface of the digital telecommunications network.

REFERENCES:
patent: 4862167 (1989-08-01), Copeland
patent: 5663721 (1997-09-01), Rossi

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