"Pete KE9OA"
As far as AM receivers, they do not have a deemphasis circuit
following the detector. With FM receivers, it is a different story.
___________

But in effect, almost every AM receiver has de-emphasis -- it is the result
of the "haystack" amplitude response of their RF/IF circuits driving the 2nd
detector. Higher modulating frequencies are rolled off, sometimes very
severely.

The problem with trying to compensate for it at the AM tx is that the amount
needed for "flat" system response varies considerably from rx to rx, and
even with carrier frequency. Even so, many MW/SW AM stations do boost their
highs, trying to get some of it to pass through the narrowband receivers
typically in use these days.

RF