Abstract: An apparatus comprising a six-port circuit, a delay device, and a computing device, wherein the delay device is adapted to divide an input signal into a first input signal and a second input signal, to delay the first input signal by a first delay time, wherein, for example, a first delayed input signal is obtained, to delay the second input signal by a second delay time, wherein, for example, a second delayed input signal is obtained, the second delay time being different from the first delay time, wherein the delay device is adapted to output the first delayed input signal to a first input of the six-port circuit, and to output the second delayed input signal to a second input of the six-port circuit, wherein the computing device is adapted to determine a first quantity characterizing a frequency of the input signal in dependence on at least one output signal of the six-port circuit.

Abstract: An electrical measuring system of a six-port circuit includes a delay line and a arithmetic unit. In a first operating mode, an electrical signal can be on the one hand transmitted directly to a first input terminal and on the other hand via the delay line to a second input terminal of the six-port circuit. In an embodiment, the measuring system is configured such that, in the second operating mode, it does not supply a signal to the first input terminal of the six-port circuit and it supplies a reference signal to the second input terminal of the six-port circuit.

Abstract: An electrical measuring system of a six-port circuit includes a delay line and a arithmetic unit. In a first operating mode, an electrical signal can be on the one hand transmitted directly to a first input terminal and on the other hand via the delay line to a second input terminal of the six-port circuit. In an embodiment, the measuring system is configured such that, in the second operating mode, it does not supply a signal to the first input terminal of the six-port circuit and it supplies a reference signal to the second input terminal of the six-port circuit.

Abstract: The invention relates to a device (1) for receiving signals for controlling a function in a vehicle, particularly for actuating the central locking of the vehicle, comprising an antenna (2), which receives the signals, and comprising an evaluation unit (5), which is connected down therefrom and which evaluates the received signals, and a control of the function ensues based on the evaluation of these signals. The invention provides that a matching unit (3) is connected between the antenna (2) and the evaluation unit (5) and matches the actual impedance of the antenna (2) to the input impedance of the evaluation unit (5).