Ali Corporation

Zhi-Ming Zeng

Wei-Jian Lin

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.

Communication device and echo cancellation method thereof

A network connection device and a cable status detection method are provided. The network connection device is configured to connect and detect a connection cable. The network connection device includes an interface module, a physical layer transmission circuit and a cable status detection module. The interface module connects the connection cable. The physical layer transmission circuit sends signals to the connection cable or receives signals from the connection cable through the interface module. The cable status detection module receives a notification notifying that the physical layer transmission circuit is in a disable state, and detects the status of the connection cable and generates a detection result when the physical layer transmission circuit is in the disable state. In this way, the network connection device may transmit data signals though the connected connection cable and detect the status of the connection cable.

Network connection device and cable status detection method

An auto gain controller (AGC) and a control method thereof are provided. An input signal is amplified by a radio frequency (RF) amplifier and an intermediate frequency (IF) amplifier. When strength of the input signal is lower than a threshold, a gain curve of the RF amplifier is lowered while a gain curve of the IF amplifier is raised. When the strength of the input signal is greater than the threshold, a takeover point (TOP) of the IF amplifier is changed from a first takeover point to a second takeover point.

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Shanghai, China

Zhi-Ming Zeng