David Schwingshackl

Line termination device for a telephone subscriber line

Method for measuring a load impedance

Device for transmitting analog data stream e.g. via telephone line, includes compensation device for compensation of spectral secondary components of multi-audio signal

Broadband system e.g. asymmetric digital subscriber line system, for e.g. subscriber telephone exchange, has adaptation device adding generated compensation signal to broadband signal to compensate distortion of sinusoidal signaling signal

Transmission apparatus with variable impedance matching

Apparatus for compensating for interference on receiving a data signal on which an interference signal is superimposed esp. a sinusoidal interference signal

Amplified signalling signal harmonic oscillation compensation circuit for ADSL interference reduction calculates amplitudes and phases for compensation signal applied at input

Transmitting signal pre-distortion method for extended digital subscriber line modem, involves pre-distorting intermediate signal according to predictor transfer function for generating feedback signal

Correlated discrete disturbers cancelation in data communication systems

Method and apparatus for transmitting speech signal via data telecommunication network