Actually, for analog FM stereo, it's 19KHz (+ or - 2 Hz) at 10% or less modulation.
Also, the lower sideband of the L-R
stereo subchannel extends downwards from it's center at 38 KHz towards 19KHz, so you
may also be getting alias
components from the extreme high end of the subchannel if the lowpass filter in your
tuner is not working properly. To bad
MD doesn't have an optional 32 KHz sample rate; if it did, the anti-alias filter in
the recorder would for sure eliminate the
19KHz pilot subcarrier... Some modern tuners use a 19KHz cancellation by adding in a
19 KHz signal 180 degrees out-of-
phase at exactly the right level. Of course they still need a low pass filter after
that to take out the alias from the stereo
subchannel. The cancellation method just further reduces the level of the continuous
19 KHz signal...
US analog TV stereo uses a similar scheme, using the horizontal frequency (a little
less than 15750 Hz) for the pilot and 2X
that for the stereo subchannel center.
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