Network receiver and adjusting method thereof

An adjusting method of a network receiver, wherein the network receiver comprises a first delay unit and a second delay unit, the first delay unit is coupled to a first transmission line, the second delay unit is coupled to the second transmission line, and delay amount of the first delay unit and the second delay unit is controlled by an adjusted unit, and the adjusting method comprising:

• utilizing the first delay unit to use a plurality of delay amount combinations provided by the adjusted unit to delay a plurality of first signals from the first transmission line, respectively, to generate a plurality of delayed first signals;
• and utilizing the second delay unit to use the plurality of delay amount combinations provided by the adjusted unit to delay a plurality of second signals from the second transmission line, respectively, to generate a plurality of delayed second signals;
• calculating differences between the plurality of delayed first signals and plurality of delayed second signals, respectively, and process the differences to generate a plurality of first data, respectively;
• 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
• adjusting delay amount of the first delay unit and the second delay unit according to the plurality of first data;
• wherein the step of generating each of the plurality of first data comprises:
• calculating the difference between the delayed first signal and the delayed second signal;
• providing a first variable capacitor to delay the difference to generate a delayed difference;
• filtering the delayed difference to generate a filtered difference;
• and
• performing an analog to digital conversion operation upon the filtered difference to generate the first data.

A network receiver, coupled to a first transmission line and a second transmission line, comprising:

• a first processing unit, comprising:
• a subtractor, for receiving a first signal from a first transmission line, receiving a second signal from a second transmission line, and calculating a difference between the first signal and the 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;
• and
• a second processing unit, comprising:
• an adder, for receiving the first signal and the second signal, and calculating a summation of the first signal and the second signal;
• a second variable capacitor, coupled to the adder, for delaying the summation to generate a delayed summation;
• a second low-pass filter, for filtering the delayed summation to generate a filtered summation;
• and
• a second analog to digital converter, coupled to the second low-pass filter, for performing an analog to digital conversion operation upon the filtered summation to generate second data;
• and
• an adjusting circuit, coupled to the first processing unit and the second processing unit, for adjusting a capacitance of at least one of the first variable capacitor and the second variable capacitor;
• wherein the adjusting circuit adjusts the first variable capacitor and the second variable capacitor to make the first variable capacitor and the second variable capacitor have a plurality of capacitance combination, the first processing unit generates a plurality of first data corresponding to the plurality of capacitance combination, and the adjusting circuit adjusting the capacitance of at least one of the first variable capacitor and the second variable capacitor according to the plurality of first data.

An adjusting method of a network receiver, wherein the network receiver is coupled to a first transmission line and a second transmission line, the adjusting method comprising:

• (1) receiving a first signal from the first transmission line, and receiving a second signal from the second transmission line;
• (2) calculating a difference between the first signal and the second signal;
• (3) providing a first variable capacitor to delay the difference to generate a delayed difference;
• (4) filtering the delayed difference to generate a filtered difference;
• (5) performing an analog to digital conversion operation upon the filtered difference to generate first data;
• (6) calculating a summation of the first signal and the second signal;
• (7) providing a second variable capacitor to delay the summation to generate a delayed summation;
• (8) filtering the delayed summation to generate a filtered summation;
• (9) performing an analog to digital conversion operation upon the filtered summation to generate second data;
• (10) for a plurality of capacitance combinations of the first variable capacitor and the second variable capacitor, repeating Steps (1)-(9) to generate a plurality of first data and a plurality of second data;
• and
• (11) adjusting the capacitance of at least one of the first variable capacitor and the second variable capacitor according to the plurality of first data.