Patent ID: 6868118

Claim:
A discrete multi-tone (DMT) processor that receives predetermined control signals from a digital signal processor (DSP) in an asymmetric digital subscriber line (ADSL) modem, modulates transmission data in response to the control signals, and demodulates reception data, the DMT processor comprising: a frame synchronization signal generator that generates a transmission frame synchronization signal and a reception frame synchronization signal in response to a cyclic prefix contained in the transmission data or the reception data, and in response to a reception synchronization shift signal provided by the DSP; a protocol signal generator that receives a predetermined command signal from the DSP and generates a protocol signal for initializing communication of the transmission data; a transmitter that DMT modulates and gain-controls the transmission data input through a first input terminal in response to the transmission frame synchronization signal and outputs the modulated and gain-controlled result through a first output terminal; and a receiver that gain-controls and DMT demodulates the reception data applied through a second input terminal in response to the reception frame synchronization signal and outputs the demodulated and gain-controlled result through a second output terminal.