 Method for communicating between a microprocessor and an interface circuit |
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Bidirectional digital serial interface for communication digital signals including digitized audio between microprocessor-based control and transceiver units of two-way radio communications equipment
| Details |
Inventors: Kasparian, Kaspar A.; Rogers, Aaron S.; Hsu, Ming-Chyuan; Fussell, John P.;
Assignee: Teletec Corporation (Raleigh, NC)
Primary Examiner: Orsino; Joseph A.
Assistant Examiner: Negash; Kinfe-Michael
Attorney, Agent or Firm: Breneman & Georges
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. |
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DETAILED DESCRIPTION It is a primary objective of this invention to provide a new digital interface system for communicating digital signals, including digitized audio, between microprocessor-based Control and Transceiver Units of two-way land/mobile radios and other communications equipment, using a serial bus structure.
It is a related objective of the invention to provide a preferred embodiment with specific channel grouping and specific coding that will allow the advantageous utilization of the system of the invention in many communications equipment, especially in microprocessor based two-way land/mobile radio equipment.
A further object of the invention is its embodiment in different ways to produce new capabilities for communications equipment, such as the addition of remote programming and control-takeover of radio transceivers employing digital techniques.
Another aspect of the invention is the elimination of problematic, bulky multiconductor control cables and complex connectors used in conventional interfaces of Control Units with their respective Transceiver Units.
With the system of the invention, two linking conductors need only be used (four conductors may be utilized in a differential mode for especially long distances).
It is a related object of the invention to allow comprehensive modifications during use of the equipment to accommodate changes in network parameters and operational requirements, without requiring modification of the linking medium between Control and Transceiver Units of radio communications equipment.
Yet another aspect of the invention is to accommodate modern optical fiber links between Control and Transceiver Units.
Optical fiber cables are very compact and easy to install under carpeting or in tight quarters.
They are immune to noise reception and radiation and are free from cross-coupling problems.
Additionally, they require simple connectors in lieu of bulky, expensive and inherently inflexible multipin connectors of the prior art.
It is another object of the invention to allow field convertibility of sophisticated, software-enhanced, versatile two-way radios from a trunk-mount configuration into a dash-mount version (Transceiver and Control portions integrated into a combined package), without requiring changes in the physical connections between the two units whenever network or operational changes are accommodated through programming
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