| 摘要 |
PURPOSE:To reduce the size of a common circuit when there are many adaptive hybrid circuits by forming the common circuit in addition to two hybrid circuits and coupling a four-wire input signal line, a four-wire output signal line and a two-wire signal line. CONSTITUTION:Signals outputted from four-wire input signal lines 10, 20 in the two hybrid circuits are inputted to adaptive filters 16, 26 and one of the signal lines 10, 20 is selected by a selection circuit 1 in the common circuit 7 to input the signal to an adaptive filter 2. An output corresponding to the signal line selected by the circuit 1 is selected out of the outputs of the connection points 13, 23 between two-wire and four-wire lines by a selection circuit 3 and the output of the filter 2 is subtracted by a subtractor 4 on the basis of the output of the circuit 3. In addition, signal sneak from the input of the filter 2 to the subtractor 4 is minimized by a factor control circuit 5. The output of the control circuit 5 is applied to filters 16, 26 as a factor through a factor feeding circuit 6 and the signal lines 10, 20 are connected with the four-wire output signal lines 11, 21 and the two-wire lines 12, 22. |
