In 1998, ETSI publicized TETRA protocal, which is a standard of digital trunked radio communication system.

TETRA协议是欧洲电信标准协会(etsi) 1998年公布的一种数字集群通信系统标准。

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This paper describes the basic theory of speech compression encoding and decoding algorithm in TETRA (terrestrial trunked radio) system.

研究了陆地集群无线通信（TETRA）数字集群移动通信系统的语音压缩编解码算法的基本原理。

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Recent years, with the rapid development of communication, the research of digital trunked radio communication system becomes more and more important.

近年来，随着通信的飞速发展，作为专用移动通信系统的数字集群通信系统的研究也变得越来越重要了。

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Trunked radio is digital, allows more efficient use of spectrum, and does not tie a radio to a specific talk channel.

FORBES: Connect

Digital trunked radio is employed throughout the federal government for the most sensitive of communications that involve the protection of the President, military operations, anti-terrorist surveillances, and criminal investigations.

FORBES: Free Speech v. Denial Of Communications For Public Safety Agencies?

In 2000, our Governor determined that we should implement the first statewide digital trunked radio system in the United States, utilizing primarily Motorola mobiles, portables and base station equipment which was then state of the art.

FORBES: Free Speech v. Denial Of Communications For Public Safety Agencies?