Symbian OS 及通讯技术术语全解
2010-02-25 04:32:00 来源:WEB开发网在移动电话技术中,第三代协议支持更高的数据传输速率(以兆比特/秒计算),它们不仅适合于传送语音,更可支持范围广泛的应用。3G 网络试验2001 年开始于日本。到2002 年,已有部分欧洲和部分亚太地区开始使用3G 网络,以后将在美国使用。3G 将支持占用大量带宽的应用程序,如全动感视频、视频会议和完全的Internet 访问。
AMPS
Advanced Mobile Phone System: a 1G standard which operates in the 800-900MHz-frequency band. It is still widely used in the United States.
高级移动电话系统:工作于800-900MHz 波段下的1G 标准。它仍在美国广泛使用。
Analog
The simple way to transmit speech, which is translated into electronic signals of different frequency and/or amplitude. The first networks for mobile phones, as well as broadcast transmissions, were analog. Due to being longer established in some countries, analog networks may offer better coverage than digital networks, however analog phones are less secure and suffer more from interference where the signal is weak. Analog systems include AMPS, NMT and ETACS.
用于传输语音的简单方法,它们转换为不同频率和/或振幅的电子信号。第一个手机网络和广播传输网络都是模拟的。由于模拟网络在一些国家建立的时间较长,所以它可能比数字网络的覆盖面更宽,然而,模拟手机的安全性较差,且在信号较弱的情况下下更容易受到干扰。模拟系统包括AMPS、NMT 和ETACS。
API
Historically, "application programming interface". Practically, an API is any interface that enables one program to use facilities provided by another, whether by calling that program, or by being called by it. At a higher level still, an API is a set of functionality delivered by a programming system, and as such the mix of APIs in a particular system tells you what that system can do.
在历史上是指“应用程序编程接口”。实际上,API 是指允许一个程序使用另一个程序的功能(通过调用另一个程序或被另一个程序调用)的任何接口。从更高层面上讲,API是一组由编程系统提供的功能,同样,特定系统中的不同API
更多精彩
赞助商链接