What does FM mean in a car?

[MaggieLynn]

FM in a car refers to the frequency modulation band in the radio function of the car audio system. It represents the technology used by radio stations to transmit signals and the reception standard of the receiving equipment (radio). The following are the characteristics of the FM band: 1. Broadcast frequency range: 87.5~108MHz. Due to the different audio signal modulation methods used, the restored sound quality is clear, far better than the effect of amplitude modulation. For example, in wireless TV signals, the image uses amplitude modulation, while the accompanying sound uses frequency modulation. 2. FM signals modulate the audio signal onto the "frequency" of the high-frequency carrier wave and transmit it into the air. The FM radio receives the FM station signal through the antenna, then processes it through tuning → intermediate frequency amplification → frequency discrimination circuit to separate the audio signal, which is then amplified by low-frequency amplification and output through the speaker to produce sound.