Yes, that's true.
I know what FM modulation/demodulation is but what is Weiss?
What are you trying to achieve?
Anything to do with metal detectors? as in discrimination or detection?
I am just curious.
EDIT: I just read this in Wiki....
Other FM detectors
Less common, specialized, or obsolescent types of detectors include:
[8]
- Travis[9] or double tuned circuit discriminator using two non-interacting tuned circuits above and below the nominal center frequency
- Weiss discriminator which uses a single LC tuned circuit or crystal
- Pulse count discriminator which converts the frequency to a train of constant amplitude pulses, producing a voltage directly proportional to the frequency
Martin