Design And Implementation Of Vehicle Bluetooth Voice Interactive System

With the wider application of vehicle electronic products,vehicle system has become an important part of modern cars.The traditional man-vehicle interaction ways of touching and key-pressing are complicated to operate,so the driver's attention is easy to distract and the risk of driving adds.The voice interaction is the most natural and direct interaction way of man-machine communication.As long as the meaning of the semantic expression is accurate enough,the most wanted result can be directly pushed according to the demand.A Bluetooth voice interaction application system is proposed according to the actual application requirements of vehicle-mounted hands-free telephones and Bluetooth speakers in driving scenarios and in combination with speech synthesis technology and speech recognition technology.The driver use voice command to access to the Bluetooth device in the car and accepts system voice instructions,feedbacks,and alerts in the event of an emergency.The design of hardware and software of the system in detail.For hardware,the system takes the X1000 main chip as the core,and expands the peripheral I/O interface to connect buttons and indicators,and performs voice transmission and audio data transmission through the PCM interface and UART interface and the BCM43438 Bluetooth chip,uses a dedicated echo cancellation and noise suppression chip FM1288 as the Voice processing unit,and connects the microphone and audio amplifier to form an efficient and stable audio input and output unit.The circuit connection design that implements the specific functions of the hardware platform is described in detail,besides,the design work of the system power supply,Bluetooth communication unit,audio input and output unit,TF card storage unit,key and indicator unit are done step by step.The system software design closely combines with the hardware platform,based on the embedded Linux software platform for the design and implementation of system application,including system control application and Bluetooth application.The system control application takes the function modularity as the design idea,adopts message delivery mechanism to coordinate and control the orderly operation of vehicle application,and provides the voice interaction function.The Bluetooth application is based on the Bluetooth protocol stack and the Bluetooth application profiles to implement the main functions of the vehicle-mounted hands-free telephones and Bluetooth speakers,including functions such as phone book synchronization,audio stream transmission,audio remote control,and telephone call control.By integrating the software and hardware platforms,and testing the system voice interaction services and Bluetooth application services function in various conditions and with different Bluetooth devices,the conclusion showing that the system works in an orderly manner and can coordinate the control of the audio input and output of the vehicle equipment and can meet the requirements of Bluetooth voice interaction in driving scenarios.After testing and practicing,the application of system meets the demand of market,and also achieves the functional design goals.The system is highly scalable and can be easily added to other vehicle applications to interact with other device nodes in the vehicle network,having a broad market prospect in the field of vehicle voice interaction.