HSP, HFP, A2DP

      As for the purchase of Bluetooth headsets, because of the many brands of mobile phones and headsets, the most troublesome for consumers is the compatibility between mobile phones and Bluetooth headsets. The manufacturer pointed out that the Bluetooth headset has a HeadsetPro-file (HSP) in terms of specifications.

HandfreeProfile (HFP) and A2DP are three specifications. The HSP provides the basic functions required for communication between a mobile phone (mobile phone) and a headset. HandfreeProfile

      (HFP) adds some extensions to the HeadsetPro- file (HSP), which was originally only used to control the mobile phone from the Bluetooth headset fixed car handsfree. A2DP (Advanced Audio Transmission Specification) - Allows transmission of stereo audio signals. (The quality is much better than the mono encryption for HSP and HFP). Determine the compatibility of the headset with the phone. Among them, the HFP format Bluetooth headset supports the mobile phone function more completely, and the consumer can simultaneously operate the mobile phone to set the hands-free option functions such as redial, call retention, and call rejection.

      For example, the Bluetooth headsets introduced by several major manufacturers such as Nokia, Motorola, Sony Ericsson, and Jebel Jebre are mainly supported by HFP format. QCY and Pamel Bluetooth headsets support both HFP and HSP. Special attention should be paid when purchasing.

      In addition, when consumers purchase blue goods, they often encounter the problem of how to choose the Bluetooth technology version. The Bluetooth version is different, which is related to the quality of the received signal. The new version emphasizes the ability to overcome noise interference, and all the latest versions of Bluetooth are designed to be downward. Compatible with all previous versions, 2.0 version of the device and version 1.1 can also be freely connected, 3.0 compatibility is relatively strong, is a relatively mature technology, and Bluetooth 4.0 is also a high version compatible with the low version, and battery life is also because of technical tips Increase, consumers should measure prices and demand when purchasing.

Bluetooth headset usage distance: not only depends on the headset

      Another important part of the Bluetooth headset is the transmission distance, which is independent of the Bluetooth version and depends on the Bluetooth technology PowerClass. Most mobile phones and mobile devices use

      PowerClass2, standard transmission distance of 10 meters: and upgraded PowerClass1 is to increase the transmission distance to 100 meters, both versions support A2DP stereo transmission protocol, can be connected with stereo headphones. In general, 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 is more than 8 meters, there will be a breakpoint. More than 10 meters will be between the Bluetooth devices. Will lose connection.