Patent ID: 7486788

Claim:
A transceiver for a transmission and reception signal which can be transmitted via a signal line having a particular line impedance, comprising: a) a line driver for driving a transmission signal via the signal line, the line driver having a synthesized output impedance; b) a programmable analog echo cancellation filter for signal suppression for an echo signal brought about by the transmission signal; c) a hybrid circuit for connecting said analog echo cancellation filter to the signal line, the hybrid circuit comprising: a first two-pole connection connected to the output of the line driver, a second two-pole connection for connection to the signal line, a third two-pole connection connected to the analog echo cancellation filter, series resistors being connected, in series with the line impedance of the signal line, between the first two-pole connection and the second two-pole connection, a first and a second series-connected crosscoupling resistor respectively connected between the first two-pole connection and the second two-pole connection, wherein the third two-pole connection of the hybrid circuit for connecting the echo cancellation filter is tapped off between the series-connected crosscoupling resistors, and wherein the resistance values of the resistors connected in the hybrid circuit satisfy the following equation: R2 = R3 · R SYN R ⁢ ⁢ 1 + R SYN Where R 1 is the resistance value of the series resistors, R 2 is the resistance value of the first crosscoupling resistor, and R 3 is the resistance value of the second crosscoupling resistor, and where R SYN is the synthesized output impedance of the line driver, d) a reception filter for filtering a signal received via the signal line; and e) a subtraction circuit which subtracts from the filtered output signal of the reception filter the transmission signal simulated by the echo cancellation filter to generate a reception signal liberated of the echo signal.