Specification And Distance Of Bluetooth Headset

1. Specifications of Bluetooth headset: HSP, HFP, A2DP

As for the purchase of Bluetooth headsets, because there are many brands of mobile phones and headsets, the compatibility between mobile phones and Bluetooth headsets is the most troublesome problem for consumers. The manufacturer pointed out that the Bluetooth headset has three specifications: headset pro file (HSP), handfreeprofile (HFP) and A2DP. HSP provides the basic functions required for communication between mobile phone and headset. Handfreeprofile (HFP) adds some extended functions on the basis of headset pro file (HSP), which was originally only used to control mobile phones from fixed car handsfree devices with Bluetooth headsets. A2DP (advanced audio transfer specification) – allows the transmission of stereo audio signals. (the quality is much better than mono encryption for HSP and HFP). Determine the compatibility between the headset and the phone.

Among them, the Bluetooth headset in HFP format supports relatively complete mobile phone functions. Consumers can simultaneously operate the handsfree options such as redial, call reservation, and call rejection set by the mobile phone on the headset. Take the Bluetooth headsets launched by several large manufacturers as an example, almost all of them support HFP format.

In addition, when purchasing Bluetooth products, consumers often encounter the problem of how to select the Bluetooth technology version. The different versions of Bluetooth are related to the quality of the received signal. The new version emphasizes the ability to overcome noise interference. Moreover, all the latest versions of Bluetooth are designed to be backward compatible with all previous versions. The devices of version 2.0 and version 1.1 can also be connected freely. The compatibility of version 3.0 is relatively strong and it is a relatively mature technology, Bluetooth 4.0 is also a high version compatible with a low version, and the battery life is also increased due to technical tips. Consumers should measure the price and demand when purchasing.

2. The use distance of Bluetooth headset: not only depends on the headset

Another important decision of Bluetooth headset is the transmission distance, which is not related to the Bluetooth version, but depends on the Bluetooth technology powerclass. Most mobile phones and mobile devices use powerclass2, with a standard transmission distance of 10 meters; The upgraded powerclass1 increases the transmission distance to 100 meters. Both versions support A2DP stereo transmission protocol and can be connected with stereo headphones. Generally speaking, the distance between the mobile phone and the Bluetooth headset is not too far. If there is no big obstacle in the middle, the transmission quality is very good within 7 meters. If it exceeds 8 meters, there will be a breakpoint! Bluetooth devices over 10m will lose connection.

According to the feeling of actual use, the distance between the mobile phone and the Bluetooth headset is proportional to the call noise; In addition, when using stereo Bluetooth headset to listen to music, do not be too far away from the mobile phone, otherwise it is easy to appear intermittent phenomenon. Many consumers hang Bluetooth headsets on their ears at any time, so the shape becomes the basic condition; Each person's ear shape is different, so the user has to try the comfort before buying; People who wear glasses need to pay more attention to the fact that the ear hanging part of many Bluetooth earphones may conflict with the legs of glasses. You must try them on before you know.