Patent attributes
A canceller circuit includes a subtractor, receiving an analog received signal and a replica signal of noise (e.g., echo and/or crosstalk), for carrying out subtraction on the received signal and the replica signal in a continuous time analog domain, an analog-to-digital converter for converting an analog signal output from the subtractor to a digital signal, an adaptive filter, receiving a noise reference signal and an output signal of the analog-to-digital converter, for outputting the replica signal of noise, as a digital signal, a digital-to-analog converter for receiving and converting a digital signal output from the adaptive filter, to an analog signal, and for supplying the analog signal to the subtractor as the replica signal of noise, and a control circuit for variably controlling the sampling phase in the digital-to-analog converter independently of the sampling phase on the side of the analog-to-digital converter, the phase of the signal waveform of the replica signal of the noise, output from the digital-to-analog converter, being controlled by the control circuit to be coincident with the phase of noise received.
