Car audio and mobile phone dual screen synchronous interactive Bluetooth solution This solution\'s Bluetooth communication protocol is a Bluetooth application software that the company uses to realize the synchronous interaction between the car screen and the mobile phone screen in accordance with the needs of high-end car audio, in conjunction with high-definition image synchronization (MHL). This solution is based on the CSR8670 4.0 dual-mode Bluetooth module, including A2DP (music playback), AVRCP (streaming media control and music cover transmission), HFP (hands-free calling), SPP (data transmission), PBAPC (phone book synchronization), HID (mouse), BLE DataTrans (small data transmission in low power mode) and other Bluetooth protocols. The module uses the UART interface to communicate with the MCU, realizing the dialing of calls, music playback and remote control, music cover synchronization, downloading of mobile phone books, data transmission, control instructions and touch coordinate instruction transmission, etc., thereby realizing the dual-screen synchronous interactive function. The phone hands-free and echo cancellation use CSR\'s latest CVC voice enhancement technology to achieve high-definition hands-free calls and echo cancellation. Automatic download of mobile phone books, call information is clear at a glance. Music playback and cover synchronization for better music playback1. Built-in high signal-to-noise ratio digital-to-analog conversion is adopted, with a signal-to-noise ratio of -92dB2. Built-in multi-channel audio source input circuit, which can realize analog audio, I2S and SPDIF input3. High-speed DSP realizes 6-band EQ adjustment memory, and different sound effect scenes can be selected4. Adopts the latest Bluetooth protocol of the International Bluetooth Alliance (SIG) to realize music cover synchronizationCar and mobile phone dual-screen interactionThe SPP and HID of this solution realize data command transmission and touch coordinate transmissionTouching the car screen is equivalent to touching the mobile phone screen, and combined with MHL to realize dual-screen synchronous interactionCompatible with Android and IOS data communicationAdopts 4.0 Bluetooth dual-mode protocol, and realizes IOS data communication without MFI
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