Introduction to Bluetooth knowledge of car navigation
As a short-range communication technology, Bluetooth is currently equipped with the vehicle industry as standard. The following describes the basic knowledge of Bluetooth car navigation and Bluetooth basic knowledge from the following Bluetooth protocols. Bluetooth, as a short-range communication technology, is currently equipped with the vehicle industry as standard. The following is an introduction to the basic knowledge of Bluetooth car navigation from the following Bluetooth protocols.
1：The full name is Hands-Free Profile, Bluetooth hands-free specification) defines how the Bluetooth master device can make and receive calls through the Bluetooth hands-free device. HFP includes two roles: Audio Gateway (AG, audio gateway or master) and Hands-Free Unit (HF, hands-free device or slave). AG is an audio input and output device. A typical AG device is a mobile phone. HF is a remote audio input and output device that implements an audio gateway. · A common scenario for HFP is the car kit on the car. When the car kit and headset are connected to the mobile phone via Bluetooth, the wireless Bluetooth headset is used to make and receive calls. We use to make and receive calls
2: A2DP
The full name is Advances Audio Distribution Profile, a high-quality audio distribution specification, which defines how to transmit stereo-quality audio from the media source to the receiver through streaming media. A2DP uses the Asynchronous Connectionless Link (ACL, Bluetooth asynchronous transmission) channel to transmit high-Quality audio content, it depends on Generic Audio/Video Distribution Profile (GAVDP, General Audio/Video Distribution Specification). A2DP must support low complexity and Sub-band codec (SBC, low-bandwidth codec), and optionally supports MPEG1,2 audio, MPEG2, and 4AAC. There are two application scenarios for A2DP: playback and recording. · The playback scenario is that a player with Bluetooth function transmits high-quality audio to Bluetooth headsets or Bluetooth stereo speakers through A2DP. · The recording scene is that a microphone with Bluetooth function transmits high-quality audio to the Bluetooth recorder through A2DP. Specifications related to A2DP include Video Distribution Profile (VDP, video distribution specification), Audio/Video Remote Control Profile (AVRCP, audio/video remote control specification). This protocol is often used for Bluetooth music and voice wake-up functions
3: PBAP
The full name is Phonebook Access Profile, phone book access specification. Usually, the user can download the phone book in the mobile phone to the local of the car through this protocol, and then can view the contacts or incoming calls on the car side by displaying the contact name, avatar, and other related information.
4: OPP
The full name is Object Push Profile, object push specification, which defines the specification of object exchange between push server and client based on Generic Object Exchange Profile (GOEP, General Object Exchange Specification). OPP application OPP is mainly used for mobile phones or computers and vehicles. File operations via Bluetooth between navigations. This is less used
5: The full name of HSP is Headset Profile, headset specification, this is mainly used on the headset
6: The full name of HID is: HUMAN INTERFACE DEVICE PROFILE, Bluetooth man-machine interface specification, which defines the configuration specification of the mouse, keyboard, remote control, etc. This can be used to control the screen, through the HID mouse or touch screen protocol to control the phone screen
7: Carplay or Android Auto
The Bluetooth module or protocol stack supports the iAP2 protocol, channel (virtual socket: bw_iap), the Apple mobile phone, and the car interact through the iap channel, and then send the current WLAN AP information to the mobile phone. The car machine needs to add Apple's MFi chip. Android Auto is simpler than Carplay and does not require encryption chips and MFi certification.
With regard to the Bluetooth application on the car navigation, there are functions such as three-way calling, dual-link, music album information, and so on.
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