Patent ID: 8605759

Claim:
A device comprising: a multiplexer configured to (i) receive a plurality of signals, and (ii) generate an output signal based on a selected one of the plurality of signals, wherein the output signal comprises a plurality of frequencies and has a respective signal magnitude at each of the plurality of frequencies; a control circuit configured to determine a plurality of gain values; and a transmitter configured to (i) provide pre-emphasis to the output signal to offset a characteristic of a channel, and (ii) transmit the output signal with the pre-emphasis on the channel, wherein the transmitter, in providing the pre-emphasis to the output signal, is configured to provide a plurality of delayed versions of the output signal, wherein each of the delayed versions of the output signal has a different amount of delay than other ones of the delayed versions of the output signal, and amplify each of the delayed versions of the output signal based on a respective one of the plurality of gain values such that (i) the signal magnitudes at certain ones of the plurality of frequencies are amplified, and (ii) the signal magnitudes at other ones of the plurality of frequencies are attenuated.