1. demodulate and Store the Instrument Source Packets (ISP) data;

2. Modems modulate and demodulate outgoing as well as incoming data signals.

3. AM detectors cannot demodulate FM and PM signals because both have a constant amplitude.

4. This signal is amplified, AC-coupled, sample-and-held during a stable active portion of the LED drive signal to demodulate the relevant signal.

5. In order to demodulate an amplitude-modulated signal, two capacitors (C1, C2) are provided to which a signal rectified by a diode (D1) and having a voltage (U1) can be fed.