Abstract: The present invention relates to a method for attenuating near-end crosstalk between a remote received signal and a locally transmitted signal in a bidirectional signal transmission wherein said method comprises the step of producing an analog automatic feedback-driven correction loop in order to provide a no-correlation between said transmitted and received signals and to a hybrid circuit for enabling said method.

Abstract: The present invention relates to a method for attenuating near-end crosstalk between a remote received signal and a locally transmitted signal in a bidirectional signal transmission wherein said method comprises the step of producing an analog automatic feedback-driven correction loop in order to provide a no-correlation between said transmitted and received signals and to a hybrid circuit for enabling said method.

Abstract: According to the invention, means for reducing the interference caused by a voltage or a current in common mode, comprise adders (S3; S4) in each path for adding a first counter-reaction voltage (V1) to the voltage of the relevant path, a bridge (R1, R2) and an inverter (I3) for provision of said first counter-reaction voltage which is equal to half the sum of the voltages (VA, VB), respectively supplied to the inputs (A; B), with an opposing sign. According to the invention, the effect of a delay introduced by the inverter (I3) may be reduced, whereby said stage further comprises means (S5; S6) for adding in addition to the input voltage for each path, a second counter-reaction voltage (Va1; Vb1), and means (R1, R2, I1, S1; I2, S2) for provision of a second counter-reaction voltage (Va1; Vb1) which is a function of the input voltage (VA; VB) at the input corresponding to said path, with an opposing sign and with a delay identical to that generated by the inverter (I3).

Abstract: A regulator for impedance balancing of a transmission wire pair The present invention relates to a regulator for impedance balancing of first (104) and second wires (106) of a transmission wire pair having respective first and second impedances, the regular comprising: means (108) for determining a first signal (116) being representative of an average of square value of a first current (i1) flowing through the first wire, means (118) for determining a second signal (126) being representative of the average of square value of a second current (i2) flowing through the second wire, means (128, 130) for determining first and second coefficients (k1, k2) on the basis of the first and second signals, first feedback means (132,134, 136) for regulating the first current on the basis of the first coefficient, second feedback means (138,140,142) for regulating the second current on the basis of the second coefficient.

Abstract: According to the invention, means for reducing the interference caused by a voltage or a current in common mode, comprise adders (S3; S4) in each path for adding a first counter-reaction voltage (V1) to the voltage of the relevant path, a bridge (R1, R2) and an inverter (I3) for provision of said first counter-reaction voltage which is equal to half the sum of the voltages (VA, VB), respectively supplied to the inputs (A; B), with an opposing sign. According to the invention, the effect of a delay introduced by the inverter (I3) may be reduced, whereby said stage further comprises means (S5; S6) for adding in addition to the input voltage for each path, a second counter-reaction voltage (Va1; Vb1), and means (R1, R2, I1, S1; I2, S2) for provision of a second counter-reaction voltage (Va1; Vb1) which is a function of the input voltage (VA; VB) at the input corresponding to said path, with an opposing sign and with a delay identical to that generated by the inverter (I3).

Abstract: The stage includes two channels each connecting an input to an output. Each channel includes a first device for adding to the input voltage of the channel concerned a feedback voltage from the other channel to the channel concerned. For remote power feeding a terminal, the stage further includes respective means in each channel for adding a DC voltage to the output voltage of that channel. The feedback voltage is a function only of the AC component of the output voltage of the first device of the channel concerned. Application to telephone exchanges.

Abstract: The relates to locking the phase of output signal (Ys) relative to an input signal (Ye). A first frequency correction signal (Yr1) is obtained by integrating a signal representative of an error of said phase relative to a reference defined by the input signal. It then cooperates with a second frequency correction signal (Yr2) to correct the frequency of an oscillator (VCO) supplying the output signal. The second frequency correction signal is obtained with the help of an adjustment signal (Yg) by integrating an error of the first frequency correction signal (Yr1) relative to said adjustment signal. The adjustment signal may itself be obtained by integrating a frequency error. The invention is particularly applicable to telecommunications systems.

Abstract: A differential output stage for electronic equipment, the output stage comprising a two-port network having two paths, each connecting an input terminal to an output terminal, and comprising means for generating a negative feedback voltage from each path for application to the other, and means for providing an output voltage in each path equal to an identical linear combination in each path, of the input voltage to the path and of the negative feedback voltage from the other path.