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介绍了一种工作在模拟和数字两种模式的对讲机,用于满足对讲机从模拟向数字平缓过渡的需求。系统采用了微控制器与数字信号处理器相结合的方案,具有较好的实用性和可拓展性。着重对系统整体架构,微控制器控制,锁相环电路,发送和接收工作流程进行了介绍。对数字处理进行了阐述。采用TMS320VC5509为核心实现数字部分,不仅可以简化硬件电路,降低成本和功耗,而且可以方便地根据需要选择不同数字处理算法。
An intercom working in both analog and digital mode is introduced to meet the requirement of intercom smooth transition from analog to digital. System uses a combination of microcontrollers and digital signal processor program, has good practicality and scalability. Emphasis on the overall system architecture, microcontroller control, PLL circuit, sending and receiving workflow introduced. Digital processing is described. The use of TMS320VC5509 as the core digital part, not only can simplify the hardware circuit, reduce costs and power consumption, and can easily choose different digital processing algorithms as needed.