1. Bluetooth
Bluetooth technology is a wireless transmission protocol based on 2.4G technology. Because of the different protocols used, it is called different from other 2.4G technologies. It's Bluetooth technology.
For now, the most widely used application of Bluetooth technology is Bluetooth headsets. Since most mobile phones integrate Bluetooth functions, and some MP3 audio products also integrate Bluetooth modules, Bluetooth headsets have a broad mass base and low cost of use.
Due to the unique advantages of Bluetooth headsets, most Bluetooth wireless devices do not need to be equipped with a transmitter, and only the receiver of the Bluetooth headset can work, reducing the cost of use; secondly , Bluetooth headsets have good confidentiality, which is determined by the frequency characteristics of 2.4G, which means that it is not easy to cause frequency hopping, harmonics and be eavesdropped. Finally, Bluetooth headsets are now quite mature. You can buy good quality Bluetooth headsets for around 100 yuan, which is very cost-effective.
The fatal disadvantage of Bluetooth technology is that its transmission data volume is small, which can only reach about 1M per second. This is true even for dual-channel Bluetooth headsets that are claimed to be designed for listening to music. The high and low frequency parts are severely compressed. , the reserved mid-frequency part can only realize voice calls; in addition, Bluetooth technology requires payment of patent fees. Even if your Bluetooth headset is less than 100 yuan, the patent fee of 3-5 US dollars is still "essential".
2. 2.4G
In fact, the application of this frequency band is more responsible: the 2.4G frequency is also used as the carrier, but the communication methods derived from different communication protocols will be very different. The difference; just in terms of the amount of data transmitted, there is a difference from 1M per second to 100M per second.
In layman's terms, the public thinks that 2.4G headsets are headsets that use 2.4G carrier wave and P2P communication protocol (hereinafter referred to as 2.4G technology), which are different from Bluetooth headsets. At present, the 2.4G wireless transmission of the P2P protocol can reach 2M per second of data volume, while CD-level sound quality is only about 1.4M per second, so 2.4G can achieve lossless transmission; secondly, 2.4G headsets do not have high requirements for transmission power. It is more power-saving; finally, 2.4G technology can effectively increase the transmission distance by increasing power and improving reception sensitivity, and distances of more than 100 meters can be easily achieved.
In terms of product application, relying on the advantage of 2.4G technology that can work in duplex mode, wireless headsets made from it can often integrate microphone functions (of course, as the fixed bandwidth is occupied, the sound quality when the microphone is turned on will decrease), which provides great convenience for voice chat users. Coupled with the advantages of 2.4G technology such as high confidentiality, power saving, and long transmission distance, we believe this is the development trend of wireless headsets in the future.
Since 2.4G technology is still in the rapid development stage, the price of foreign 2.4G products is still relatively high. It is difficult to popularize in a short time. However, it is gratifying that domestic manufacturers also occupy a leading position in pioneering technologies such as 2.4G. In particular, the WL-4001 wireless headset launched by the domestic professional wireless brand Meige is the first 2.4G headset in China. With the price of 398 yuan and excellent performance, it has become the first choice for 2.4G headphones!
Editor’s point of view:
Traditional wireless technology, FM method is prone to interference, Bluetooth transmission bandwidth is small and other shortcomings, hindering the development of wireless products; while the new wireless technology 2.4G has high confidentiality , small size, power saving, long transmission distance, two-way duplex operation, large transmission bandwidth, etc. are the best solutions for wireless headsets. The maturity of 2.4G will improve the shortcomings of poor sound quality of wireless products to a certain extent; in 2009, wireless transmission will start with wireless headsets; 2009 may become the year of the popularity of 2.4G wireless headsets.
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