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Dan Hollands wrote:
> "MRW" <mr.whatever@xxxxxxxxx> wrote in message
> news:1134490536.577137.123670@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> > Merry Christmas and a Happy New Year!
> >
> > I was reading a datasheet from Philips and I encountered this:
> >
> > "The demodulator is also fully integrated. This has the advantage that
> > no alignment is necessary. The demodulator has a conversion factor of
> > 75mV at 22.5kHz deviation."
> >
> > What does the last sentence mean? I can't seem to comprehend it.
> >
> > Thanks!
> >
>
>
> Without knowing any background, it sounds to me like an FM demodulator the
> puts out 75mV when the input freq is 22.5kHz off the center freq
>
> --
> Dan Hollands
> 1120 S Creek Dr
> Webster NY 14580
> 585-872-2606
> dhollan3@xxxxxxxxxxxxxxxx
> www.QuickScoreRace.com
That's exactly what it is. Perhaps the OP doesn't realise that FM
converts (at the modulation stage) an amplitude to a frequency
deviation around the carrier. This leads to the inescapable conclusion
that the demodulation process must convert a frequency difference [from
a carrier, which at this is probably not the same one] to an amplitude
:)
Dear OP: Some basics of FM might help (google is your friend).
Cheers
PeteS
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