Iad Gesellschaft Für Informatik, Automatisierung Und Datenverarbeitung Mbh

Broadband United Gmbh

Manfred Deinzer

Hermann Hampel

Ulrich Berold

Johannes B Huber

Johannes Hampel

Abdul Rahman Hanoun

Roman Tzschoppe

Oliver Eckhof

Andreas Bänisch

Georg Herrmann

Abdulrahman Hanoun

A delta-sigma modulator for a switching amplifier, which achieves a high signal-to-noise ratio (SNR) in the multi-MHz range and keeps the noise-transfer function over the useful frequency range as low and as flat as possible. A series connection of a parallel-serial converter and a downstream swap element for the serial output signal yof the parallel serial converter is connected to the multi-bit output of the delta-sigma-modulator. The swap element swaps, based on the last bit value 0 or 1 of a preceding word in the resulting output signal y, the sequence of the binary zeroes and ones of the current word, where present, and then an input signal is fed to the delta-sigma-modulator. The signal is capable of having a frequency range above 25 kHz, and is prepared with a low oversampling ratio and a high SNR. And, 1-0 or 0-1 transitions are largely eliminated at the word boundaries.

Device having a delta-sigma modulator and a switching amplifier connected thereto

Disclosed are devices and methods for identification and cancellation of interfering signals, especially far-end crosstalk (FEXT), in a communication system with at least two pairs of wires of a balanced line bundle. The devices include at least a cancellation circuit, which is connected downstream to dead time elements, an interference characteristic detection device and a cancellation control unit, which controls a setting of filter coefficients of an adaptive filter and the cancellation signal source. The adaptive filter is configured as a digital cancellation filter having filter coefficients separated in time by a first delay element having the delay time T, and having an adjustable additional delay time t, whereby the setting of the additional delay time &#x3c4; takes place together with the setting of filter coefficients.

Device and method for identification and cancellation of crosstalk

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Neunkirchen am Sand, Germany

Manfred Deinzer