Major competition in Wireless Technology

The current wireless technology is dazzling and overwhelmed. Various wireless technologies have their own unique advantages and adapt to different environments to meet different needs. The following describes several mainstream wireless technologies.

FM of mainstream wireless technologies

Speaking of FM Wireless Technology, this may be one of the most mature wireless technologies with the widest application scope and the lowest cost. Your radio is the simplest FM Wireless Receiving device; some old-fashioned analog letter telephones also adopt the FM Wireless Technology.

Currently, most of the commercially available wireless headsets, some wireless speakers, and wireless microphones use FM technology. However, from the perspective of radio spectrum division, among them, 76 MHz-megamhz is the most common, while U high-segment MHz is relatively rare. Only senhaiser's wireless headphones and wireless microphones are using this technology.

The reason for its wide popularity is that the FM technology has many advantages: first, its transmission distance is far, and the distance between common products can reach 20 or 30 meters, after changing the transmit power and the sensitivity of the receiving antenna, the distance can be increased. Secondly, the FM can implement a "broadcast" connection, that is, one transmitter can match multiple receivers after being adjusted to the same frequency, it is suitable for applications of simultaneous audio translation devices. In the end, the FM technology has a strong penetration ability and is more than enough for common household users to use it. Even wall blocking is not a problem.

In terms of disadvantages, the most critical defect of FM is its poor confidentiality. Low-segment 76MHz-108MHz FM signals can be captured by the radio, while high-segment 800MHz microphone signals are prone to harmonic interference, this is also one of the reasons for the popularity of 2G 4G wireless technology. In addition, due to bandwidth restrictions, the FM Wireless Technology generally lacks sound quality, and the highest 22 KHz sampling rate is called "Radio Sound Quality "; at last, the FM Wireless Technology is vulnerable to interference, frequent strings, and other phenomena, resulting in poor stability.

Infrared in mainstream wireless technologies

According to the current situation, the infrared wireless transmission technology is the most unfamiliar and has the least contact. Most users who are in contact with infrared wireless transmission are limited to the infrared function that slowed down on early smart phones. In fact, infrared wireless technology is no less widely used than FM Wireless Technology. TV remote control is a typical example in the family.

In terms of technical application, remote control is the most widely used infrared wireless technology, and some early wireless mouse is also a wireless transmission technology; with the maturity of infrared wireless technology, it is increasingly used in high-end audio product solutions. Senhaiser's Digital Infrared microphone and the wireless infrared power amplifier of the man are typical examples.

The biggest advantage of wireless infrared technology is the high bandwidth, or even more than the other three mainstream wireless technologies. This means that audio products using infrared wireless technology can transmit large-capacity audio signals without compression, the sound quality is better. Secondly, the infrared light is a light wave. In addition to the strong light, there is little interference that affects the infrared wireless transmission, and the stability is more.

However, the infrared wireless transmission technology has some disadvantages. For example, it has high requirements on the direction, it is easy for everyone to experience that the infrared remote control cannot be operated from a slightly different angle. At present, the infrared wireless function of the Rambler has overcome this shortcoming through the New Technology). Secondly, infrared wireless transmission requires a high transmit power. If the battery is used to drive the infrared wireless headset, it is of little practical significance. Finally, the wireless transmission distance is short, generally, the distance is about 10 meters.

Mainstream wireless technology-Bluetooth

Bluetooth Technology, which is a wireless transmission protocol based on the 2.4G technology, is called bluetooth technology because different protocols are used.

Currently, Bluetooth headsets are the most widely used bluetooth technology. Most mobile phones integrate the Bluetooth function, and some MP3 audio products also integrate the bluetooth module. Therefore, Bluetooth headsets are widely used and cost-effective.

Because of the unique advantages of Bluetooth headsets, most bluetooth wireless devices do not need to set a transmitter, but only the receiver of Bluetooth headsets can work, reducing the cost of use. Secondly, bluetooth headsets have good confidentiality, which is determined by the frequency characteristics of GB. It means that it is not easy to cause frequency hopping and harmonic waves to be eavesdropped. Finally, Bluetooth headsets are now quite mature, with a cost-effective price of about RMB.

The fatal disadvantage of Bluetooth technology is that it has a small amount of data transmitted, which can only reach about 1 m per second. Even the dual-channel Bluetooth headset designed for listening to music is the same, and the high-frequency part is severely compressed, the reserved intermediate frequency can only implement voice calls. In addition, you need to pay the Patent Fee for Bluetooth technology. Even if your Bluetooth headset is less than yuan, the patent fee of $3-5 is still "essential.

2.4G mainstream wireless technology

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 quite different; only in terms of the amount of data transmitted, there is a difference from 1 Mbit/s to Mbit/s.

In general, the GB headphones use the GB carrier and P2P communication protocol (hereinafter referred to as the GB technology), which is different from the Bluetooth headset. At present, P2P protocol's 2.4G wireless transmission can reach 2 MB of data per second, while the CD-level sound quality is only about MB per second, so 2.4G can achieve lossless transmission. Second, 2.4G headphones do not have high requirements on the transmit power, which is relatively power-saving. At last, the 2.4G technology can effectively improve the transmit distance by adding high power and increasing the acceptance sensitivity. The distance above meters can be easily achieved.

In terms of product application, thanks to the 2.4G technology, the dual-duplex function can be used. wireless headphones made by this technology can often be integrated with the microphone function. Of course, as the fixed bandwidth is occupied, when the microphone is turned on, the sound quality will decrease), which provides great convenience for voice chat users. In addition, the 2.4G technology features high confidentiality, power saving, and long transmission distance. We believe this is the trend of wireless headsets in the future.

Of course, the 2.4G technology still has some disadvantages: it is better to say that it is expensive abroad and is difficult to popularize in a short time. But on the domestic situation, the current 2.4G headphones are not a few, more prominent than when the phantom launched by the WL-4001 wireless headset, with 398 yuan price in the wireless headset market unique.

Other mainstream wireless technologies

After talking about the above four mainstream wireless transmission technologies, there are a few other wireless transmission technologies that need to be mentioned, which are Wi-Fi and Kleer.

I believe that users connected to wireless networks are no stranger to wireless routers. This Wi-Fi-based wireless connection is derived from the 2.4G technology. Although the communication protocols are different between them, Wi-Fi is based on IEEE802.11a and IEEE802.11b, but like Bluetooth, it uses the 2.4G attachment band as the communication carrier, therefore, it also has the advantage of wide coverage distance. At present, the Wi-Fi communication distance in the open area can reach 305 meters, and the communication distance in the Closed Area is between 76 meters and 122 meters.

The other is the Kleer Communication Technology Based on the 2G transmission frequency, the KLR3012 RF audio module of Kleer technology can transmit data at a speed of 2.4 Mbits/s over 10 meters in the GHz band, and ensure high fidelity and lossless transmission of music files. This is the latest MX W1 wireless ear plug developed by senhaiser.

Summary

Through the comparison of the above wireless transmission methods, we found that if the headset products are wireless, The 2.4G wireless transmission can easily become the best wireless transmission solution with many advantages: high confidentiality, small size, power saving, long transmission distance, two-way duplex work, large transmission bandwidth, etc. are the best solution for wireless headsets. Poor sound quality of Bluetooth headsets, short distance from infrared headphones, and poor confidentiality of FM headphones are all bottlenecks that constrain their development. Likewise, these shortcomings are also applicable to wireless speakers.