public address systems

These developments enable new functionalities in the public address systems for the benefit of railway operators and passengers.

继续发展的这些技术，给旅客信息系统提供了有利于铁路运营部门和旅客的新功能。

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public address systems (pa systems) are commonly used in american malls, airports and grocery stores.

公共广播系统在美国的商场、机场、和杂货店普遍使用。

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Examples of other technologies include : Cable Television ( CATV ) Services, Display Systems and Public Address Systems ( PA ).

例如: 有线电视 ( CATV ) 服务 、 显示系统和公共广播系统 ( PA ) 等.

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The acoustic feedback problem is a long-standing problem appearing in sound reinforcement systems and public address systems.

在扩声系统及公共广播（Public Address，PA）中，声反馈是一个长期存在的问题。

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