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A well known product used to play music from MP3 players when driving in a car is the FM modulator. Modulators are usually a wired device, but there are also several wireless modulators available. Both products are basically doing the same thing: they allow you to play an MP3 player, such as an iPod, and listen to your music on the car’s stereo system. This is achieved by converting the audio to RF signals so that they can be played on the FM radio.

Listening to an iPod when on the go is something that is important to my everyday life. Ever since portable CD players came out, I’ve been hooked on always having portable music with me. My day would seem bland and boring if I were to listen to the radio for an extended period of time.

Earlier on we used to have Audio mikes that used cables to transmit the audio signals. Long since these have been replaced with wireless or radio mikes that use frequency based transmission technology. They operate through radio waves and can transmit audio signals in FM, AM, UHF, VHF and various digital formats.