If you live in a region with a particular TV station, you might have noticed that you can sometimes pick up some of its audio portion on your FM radio receiver. This phenomenon occurs because TV stations broadcast their audio signals using frequency modulation (FM).
TV signals are transmitted over the airwaves, and the audio portion of these signals is often modulated using FM. This means that the audio information is encoded by varying the frequency of the carrier wave. FM radio receivers are designed to pick up these frequency-modulated signals, which is why they can sometimes capture the audio from TV broadcasts.
However, it’s important to note that not all TV stations use FM for their audio. Some may use amplitude modulation (AM) or other methods. The ability to pick up TV audio on an FM radio receiver depends on the specific modulation method used by the TV station and the frequency range of your radio receiver.
In summary, the reason you can sometimes pick up TV station audio on an FM radio receiver is that the audio portion of the TV signal is broadcast using FM. This does not imply that all TV audio is broadcast as FM, but it does explain why it’s possible in some cases.