Patent ID: 8804854

Claim:
A network receiver, comprising: a first delay unit, coupled to a first transmission line, for receiving a first signal from the first transmission line, and delaying the first signal to generate a delayed first signal; a second delay unit, coupled to a second transmission line, for receiving a second signal from the second transmission line, and delaying the second signal to generate a delayed second signal; a first processing unit, coupled to the first delay unit and the second delay unit, for calculating a difference between the delayed first signal and the delayed second signal, and processing the difference to generate first data; a second processing unit, coupled to the first delay unit and the second delay unit, for calculating a summation of the delayed first signal and the delayed second signal, and processing the summation to generate second data, wherein the second data is Audio Return Channel (ARC) data; and an adjusting circuit, coupled to the first processing unit, for adjusting delay amount of the first delay unit and the second delay unit to make the first delay unit and the second delay unit use delay amount adjusted by the adjusting unit to generate the delayed first signal and the delayed second signal, respectively, to the first processing unit; wherein the adjusting circuit adjusts the first delay unit and the second delay unit to make the first delay unit and the second delay unit have a plurality of delay amount combinations, the first processing unit generates a plurality of first data respectively corresponding to the plurality of delay amount combinations, and the adjusting circuit adjusts the delay amount of the first delay unit and the second delay unit according to the plurality of first data and the first processing unit comprises: a subtractor, coupled to the first delay unit and the second delay unit, for calculating the difference between the delayed first signal and the delayed second signal; a first variable capacitor, coupled to the subtractor, for delaying the difference to generate a delayed difference; a first low-pass filter, for filtering the delayed difference to generate a filtered difference; and a first analog to digital converter, coupled to the first low-pass filter, for performing an analog to digital conversion operation upon the filtered difference to generate the first data.