Abstract: Method for establishing and possibly locating leaks in pipelines (1) for transporting liquid or gaseous media using at least one electrical conductor (2) running along the longitudinal extension of the pipeline (1) from a starting point to an end point. Accordingly, a defined test voltage (Um, UL) is applied between two electrical conductors (2) or between one electrical conductor 92) and the pipeline (1), and the resistance and/or impedance behavior between starting point and end point of the two conductors (2) or the conductor (2) and the pipeline (1) is ascertained with intact pipeline (1), and at later times, the resistance and/or impedance behavior is ascertained at the same test voltages (Um, UL) and compared to the resistance and/or impedance behavior known for the intact pipeline (1), the presence of a leak being thusly ascertained.

Abstract: A method for identifying leaks in pipes employs an electrical conductor extending longitudinally along a pipe between first and second measuring points. A measurement signal in the form of a temporally variable voltage is applied to the electrical conductor, and the impedance behavior of the conductor is used to determine the presence of a leak. A first measurement signal in the form of a temporally variable voltage is transmitted from the first measuring point to the second measuring point via the electrical conductor, and both measuring points evaluate the impedance of the electrical line. The second measuring point transmits a first result signal with the results of the impedance evaluation to the first measuring point via the same electrical conductor such that the first result signal temporally overlaps the first measurement signal, and the first measurement signal and the first result signal are present in non-overlapping frequency bands.

Abstract: Method for generating an amplified high-power alternating voltage that follows a digital input data stream in terms of shape and amplitude, preferably in the known I2S format, whereby a direct-voltage supply that takes an essentially sine-shaped current is provided as the power supply.