What does mic do?

The MIC in the car means microphone, which is the abbreviation of Microphone.

The scientific name of mic is actually called a microphone. It is an energy conversion device that converts sound signals into electrical signals. The principle of the microphone is that the vibration of the sound is transmitted to the diaphragm of the microphone. Pushing the magnet inside creates a changing current, which is sent to the subsequent sound processing circuit for amplification.

In the car, the microphone is mainly used for answering calls via Bluetooth and playing navigation voice. Wireless microphones can generally be divided into three frequency bands, namely FM band, VHF band and UHF band. The relevant introduction is as follows:

1. FM band: Since the frequency of FM radio is 88-108MHz, and the frequency of FM band The frequency of wireless microphones is higher than 108MHz, generally between 110-120MHz, so the signal of FM radio station will not cause interference to the wireless microphone in the FM segment. The wireless microphone in this frequency band has a simple mechanism and low cost; but the sound quality is poor.

2. VHF band: The VHF band is generally called the V band, with a frequency between 180-280MHz. Due to the higher frequency, less interference is received. At the same time, crystal frequency locking is used, and the receiving performance is better. Stablize.

3. UHF frequency band: The UHF frequency band is generally called the U-band, with a frequency between 700-900MHz. At such a high frequency, there are almost no other external frequencies that can interfere. At the same time, there are many U-band Using chip components, the performance is very stable and the sound quality is good.