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Wireless earphone knowledge

In the field of earphones, there is a fashion category that is gradually prospering, which is a wireless earphone that is more convenient to use. There are three types of wireless earphones on the market: infrared, meter wave, and decimeter wave, and each of these three products has its own characteristics. Consumers can make some knowledge of the wireless earphone before purchasing, so as not to buy the wrong products.

Regardless of the type of wireless earphone, electromagnetic waves are used as a means of spatial signal transmission. But depending on the frequency of the electromagnetic waves used by these headphones, they can be distinguished as:

Meter wave (meter wave 10~1m very high frequency (VHF) 30 MHz ~300 MHz) wireless earphones,
Decimeter wave (meter-wave 1m~0.1m UHF 300MHz ~3000MHz) wireless earphones, 
Infrared (30um~3mm 10GHz~1000GHz) wireless earphones

At present, the technology of infrared transmission and remote control is very mature. As close as the TV remote control, the close-range combat missiles on the fighter aircraft are guided and remotely controlled by infrared technology.
From the above digital information, you can find that the frequency of infrared rays is much higher than the frequency of ultrashort waves.

According to the formula: bandwidth = clock frequency x bus number / 8, the bandwidth of infrared communication is undoubtedly much larger than other types of wireless headphones. This allows the infrared headset to transmit the entire audio signal without any data compression. (The huge information transmission speed of optical fiber communication is precisely because the electromagnetic wave with higher frequency than infrared frequency is used as the carrier.) Secondly, thanks to the high frequency signal and the small working distance, the artificial factors are eliminated, and there is almost no daily life. What will interfere with the work of the infrared headset.

However, things always have two sides, and the higher the frequency of electromagnetic waves, the worse the diffraction. Therefore, when the infrared earphone is used, it is necessary to ensure that the earphone (receiver) and the transmitter are kept in a certain direction angle. (As with TV remote control, it is effective to align with the TV.) And as long as there are obvious obstacles between the earphone and the transmitter (for example, people, large pets), the answering of the infrared earphones may be interrupted.