Communication device and echo cancellation method thereof
First Claim
1. A communication device, adapted to implement full-duplex data transmission, and comprising:
- a transmitting circuit, receiving a digital output signal to generate an analog output signal;
a receiving circuit, receiving an analog input signal to generate a digital input signal;
a digital echo canceller, coupled to the transmitting circuit and the receiving circuit, and generating an echo energy indicator according to the digital output signal and the digital input signal;
a transceiving front-end circuit, coupled to the transmitting circuit, and receiving the analog output signal and generating a hybrid interface signal;
a hybrid fine-tune circuit, coupled to the digital echo canceller, and generating a first capacitance calibration signal and a second capacitance calibration signal according to the echo energy indicator; and
an analog echo cancellation circuit, receiving the first capacitance calibration signal and the second capacitance calibration signal, and comprising a first variable capacitor and a second variable capacitor controlled by the first capacitance calibration signal and a third variable capacitor and a fourth variable capacitor controlled by the second capacitance calibration signal, wherein the analog echo cancellation circuit receives the analog output signal and the hybrid interface signal, and generates the analog input signal according to the first capacitance calibration signal and the second capacitance calibration signal.
1 Assignment
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Accused Products
Abstract
A communication device and an echo cancellation method are provided. A digital echo canceller is coupled to a transmitting circuit and a receiving circuit to generate an echo energy indicator according to a digital output signal and a digital input signal. A transceiving front-end circuit receives the analog output signal and generates a hybrid interface signal. A hybrid fine-tune circuit generates a first and a second capacitance calibration signals according to the echo energy indicator. An analog echo cancellation circuit receives the first and second capacitance calibration signals, and includes a first and a second variable capacitors controlled by the first capacitance calibration signal and a third and a fourth variable capacitors controlled by the second capacitance calibration signal. The analog echo cancellation circuit receives the analog output signal and the hybrid interface signal, and generates the analog input signal according to the first and second capacitance calibration signals.
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Citations
11 Claims
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1. A communication device, adapted to implement full-duplex data transmission, and comprising:
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a transmitting circuit, receiving a digital output signal to generate an analog output signal; a receiving circuit, receiving an analog input signal to generate a digital input signal; a digital echo canceller, coupled to the transmitting circuit and the receiving circuit, and generating an echo energy indicator according to the digital output signal and the digital input signal; a transceiving front-end circuit, coupled to the transmitting circuit, and receiving the analog output signal and generating a hybrid interface signal; a hybrid fine-tune circuit, coupled to the digital echo canceller, and generating a first capacitance calibration signal and a second capacitance calibration signal according to the echo energy indicator; and an analog echo cancellation circuit, receiving the first capacitance calibration signal and the second capacitance calibration signal, and comprising a first variable capacitor and a second variable capacitor controlled by the first capacitance calibration signal and a third variable capacitor and a fourth variable capacitor controlled by the second capacitance calibration signal, wherein the analog echo cancellation circuit receives the analog output signal and the hybrid interface signal, and generates the analog input signal according to the first capacitance calibration signal and the second capacitance calibration signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An echo cancellation method, adapted to a communication device capable of implementing full-duplex data transmission, wherein the communication device comprises a first variable capacitor, a second variable capacitor, a third variable capacitor and a fourth variable capacitor, the echo cancellation method comprising:
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converting a digital output signal into an analog output signal and output the analog output signal by a transmitting circuit; receiving an analog input signal, and convert the analog input signal into a digital input signal for outputting by a receiving circuit; performing digital echo cancellation according to the digital output signal and the digital input signal to generate an echo energy indicator; adjusting the first variable capacitor, the second variable capacitor, the third variable capacitor and the fourth variable capacitor according to a first capacitance calibration signal and a second capacitance calibration signal, so as to determine a first optimal value of the first capacitance calibration signal and a second optimal value of the second capacitance calibration signal according to the echo energy indicator; and locking and outputting the first capacitance calibration signal and the second capacitance calibration signal according to the first optimal value and the second optimal value. - View Dependent Claims (9, 10, 11)
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Specification