As a short-distance wireless communication technology that replaces data cables, the BT PCB supports point-to-point and point-to-multipoint communication, wirelessly connecting various data and voice devices in the home or office into a pico-net, Several piconets can be further interconnected to form a distributed network (scatter-net), so as to realize fast and convenient communication between these connected devices. The realization of the Bluetooth interface on the embedded digital signal processor OMAP5910, the DSP samples the analog signal, and processes the digital signal after A/D conversion, and transmits it to the receiving end through the Bluetooth interface. Similarly, the DSP receives the Bluetooth signal The digital signal undergoes D/A conversion and becomes an analog signal.
The transceiver of the Bluetooth signal is realized by the module of the BT PCB. This bluetooth BT PCB is the company's recently launched wireless signal transceiver chip that complies with the Bluetooth V1.1 standard. The main features are: on-chip digital wireless processor DRP (DigitalRadioProcessor), numerical control oscillator, on-chip RF transceiver switch switching, built ARM7 embedded processor, etc. When receiving a signal, the transceiver switch is set to the receiving state, and the radio frequency signal is received from the antenna and is directly transmitted to the baseband signal processor through the Bluetooth transceiver. Baseband signal processing includes down-conversion and sampling, using a zero-IF structure. The digital signal is stored in RAM (32KB in capacity) for the ARM7 processor to call and process. ARM7 outputs the processed data from the encoding interface to other devices. The signal transmission process is the reverse process of signal reception. In addition, it also includes clock and Power management module and multiple general I/O ports for different peripherals. Its host interface can provide a duplex universal serial port, which can easily communicate with the RS232 of the PC, and can also communicate with the buffered serial port of the DSP.
