The first digital monitor signal is a signal generated by performing analog-to-digital conversion of an analog monitor signal obtained by monitoring an output signal of the amplifier.

The monitor band of the first digital monitor signal is narrower than the band of the compensated signal.

The conversion of the input signal to the output signal is controlled as a function of a monitoring signal generated by a monitoring transducer (26).

The channel monitor unit generates a first channel monitor signal for a truncated channel estimate vector and a second channel monitor signal.

The monitoring signal (M) and the measurement signal (X) can then be demodulated with respect to the monitoring signal, and their ratio can be determined.

The tunable optical detector detects the optical channel monitoring signal selected by the control signal and generates an electrical signal related to a power of the detected optical channel monitoring signal.

An optical signal transforming apparatus (22) applies an optical transfer function to the first signal to form the optical monitoring signal applied to the monitoring port (16).

A controller receives the monitoring signal and outputs a display signal.

A monitor signal output means (1a), which is formed on a printed board (1), outputs a monitor signal.

Monitoring means is arranged to monitor the demand signal and the voltages across the sense resistors, and generate a monitor signal.

The monitoring device outputs a monitoring signal in response to a measured parameter of the patient.

A breathing or respiratory effort signal for the patient is extracted from the patient monitor signal.

The output signal from the transmitter represents the conjunction of a power supply monitor signal, a signal to be transmitted, and a carrier.

The control system calculates a wind turbine operating command based at least in part on the first monitoring signal and the second monitoring signal.

The station includes a supervision sensor (K1) for determining the presence of the supervision signal and for providing an alarm (K5) in the absence of that signal.