Not that new cars have cassette players anymore, but in HS these were top notch and often worked better than early day Bluetooth receivers but how did they work?
In: Technology
It’s actually incredibly simple.
Sound is a wave, a simple tone is just a sine wave, and you can make complex sounds with complex waves.
A cassette simply records that sound with tiny magnetic fields on the tape, and it passes the pickup inducing a small amount of current, which matches the sound wave, which can then be amplified and when the speaker vibrates like that, it creates the sound dictated by the pattern.
Your headphones do the exact same thing, but your phone is already putting the signal out as electricity.
The 3.5mm (headphone jack) to cassette adapter just has the singal produced by your phone pass through an exposed price of metal right where the pickup would touch the magnetic tape. The electrical signal creates a magnetic field which triggers the pickup much in the same way the magnetic tape would. This transfers the signal to the pickup so it can then be amplified and played through the speakers, just like before.
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