Blue tooth machine specifications: HSP, HFP, A2DP
When choosing a pair of earpieces, due to the large number of products available on hand, the most difficult problem for consumers is the compatibility problem between the handset and the pair of earpieces. Provided by the manufacturer, the standard of the headset, there are HeadsetPro-file (HSP), HandfreeProfile (HFP) and three types of A2DP, the basic functions required for communication between the HSP provider (mobile phone) and the ear device. HandfreeProfile (HFP) in HeadsetPro-file (HSP) has been added to the basics, and it is originally only used for mobile phones that come from a fixed driver's license. A2DP (Advanced Audio Delivery Standard) – Stereoscopic voice signal. (compared to HSP and HFP, single vocal tract densification, quality required). Determined ear and hand compatibility.
Among them, the HFP-style earphone support function is perfect, and the consumer can operate the device while listening to the ear at the same time. For example, it is mainly for HFP format supported by Xiaodu.
In addition, when the consumer purchases the product, how to choose the technical version of the book, the version is not the same, the quality of the received signal, the new version of the book can be updated, and the latest edition is designed by the city. Version 2.0 has the same features as version 1.1, but it can be freely connected to version 3.0. Comparable to version 3.0. Compared to 3.0, the technology is relatively mature. Increasing, the demand of consumers to meet the demand when purchasing.