Re: FM "deviation"
I have a recollection that one of the Japanese manufacturers did some years back offer an FM tuner that used an SSB stereo decoder. Apparently the rationale was that using the lower sideband only of the subcarrier offered an improved signal to noise ratio. What the actual technique was I don’t know, although I doubt that it was done with filters. Perhaps it was done by quadrature demodulation followed by phase-shifting and summing-and-differencing. I do not recall who the manufacturer was, and I haven’t kept the reference, but it sounds like something that Pioneer, Technics or Sansui might have done. Certainly Sansui used similar techniques, albeit for AM reception not FM stereo, on its 1980s multisystem AM-stereo tuners and for sideband selection on its TU-X1.
Cheers,
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