"SFTV_troy" blabbed:
... this new receiving technique would not improve the sound
(it would still be limited from 100-6000 hertz), but would only reduce
interference.

At least in the States, AM & FM broadcasting is limited to 50 Hz to 15KHz.

Digital broadcasting is limited to under 20 Hz to over 20KHz, or basically,
the extent of the normal human hearing range.

If you're listening to 100 to 6,000 Hz, you're listening to a poor telephone
connection.

SoCal Tom