Bidirectional digital serial interface for communication digital signals including digitized audio between microprocessor-based control and transceiver units of two-way radio communications equipment

摘要

A digital serial interface system is provided for communicating digital signals including digitized audio between microprocessor-based Control and Transceiver Units of two-way radio communications equipment. The system of the invention essentially comprises three subsystems: (1) an interface in the microprocessor-based Control Unit, (2) an interface in the microprocessor-based Transceiver Unit and (3) a two-way medium for linking the two units. Various signals and audio in the Control Unit interact with a software-driven microprocessor of the Control Unit and are digitized and then translated into a serial format, organized in channel groups through a TDM (Time Division Multiplex)/PCM (Pulse Code Modulation) process and transmitted in frames through a two-way medium to the Transceiver Unit which is also microprocessor-based and incorporates a similar interface. The digital data communicated to the Transceiver Unit then undergoes a reverse process. The Interface System is duplex (bidirectional). A preferred embodiment of the digital serial interface system for two-way radio equipment includes a three channel TDM/PCM bus structure scheme, operated in a synchronous full duplex mode using the Manchester II (Biphase-L) format. Various further embodiments include: an optical fiber link medium between a Control Unit and its Transceiver Unit(s), the addition of remote takeover of programming and controls, audio enhancement of receivers during scanning, encryption/decryption systems, cloning of programs between multiple units, control of multiple transceivers through one Control Unit and other added enhancements.