DESTINATION DEPENDENT CODING FOR DISCRETE MULTI TONE MODULATION

摘要

PURPOSE: Destination dependent coding for discrete multi tone modulation is provided to overcome the weakness of the conventional singular discrete tone modulation that causes problem that available bandwidth is narrower than that of the single modem on worst line by asymmetric digital subscriber line. CONSTITUTION: The destination dependent coding for discrete multi tone modulation comprises: asymmetric digital subscriber line that transforms from digital formatted data provided from video camera or web site images to discrete multi tone symbols and that transmit the discrete multi tone symbols to other asymmetric digital subscriber line transceiver on other members line, receiver circuit, single high speed public digital subscriber transmitter that receives the data from network server connected by high speed communication line through the receiver circuit and have error correction protocol and filtering functions, and interface circuit that isolates transmitting signal from member line itself for protecting plain old telephone system and that receive modem signal.