In many receivers the three bands are not separated by filters. A PLL recovers the subcarrier, then the whole lot goes into a switch. Anything too near a multiple (especially odd multiples) of 38kHz gets mixed down to the audio band.
Filtering is difficult, because good stereo separation requires linear phase up to 53kHz as well as a completely flat passband. Hence most receivers don't have a filter to separate the L-R information from baseband L+R.
Filtering is difficult, because good stereo separation requires linear phase up to 53kHz as well as a completely flat passband. Hence most receivers don't have a filter to separate the L-R information from baseband L+R.
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