编辑:长虹网互动百科 时间:2019-12-12 05:44:59
编辑 锁定
又    称
类    别
含    义




Carson's Rule
A radiocommunications term. Carson's Rule is a method of estimating the bandwidth of an FM (Frequency Modulation) subcarrier system. It is commonly used in satellite systems in order to ensure that a high-fidelity, sharp TV picture will be delivered over a subcarrier TV channel. Violation of Carson's rule results in a higher video signal-to-noise ratio, at the expense of streaking in fast-moving scenes, sharpness of picture, and loss of audio fidelity. Carson's rule states that B = 2x(Df+fmax)(A-3), where B is the bandwidth, Df is the peak deviation of the carrier frequency, and fmax is the highest (maximum) frequency in the modulating subcarrier signal.


一种无线通信术语。Carson 法则用于评估FM(调频)子载波系统带宽。卫星系统通常使用这种方法来确保高传真度、高清晰度电视图像能够通过子载波电视频道传输。不遵守Carson 法则的结果是视频信噪比更高、快速移动的频幕上出现条纹、图像清晰度下降、视频保真度受到损失。Carson 法则共识是 B = 2x(Df+fmax)(A-3),其中B 代表带宽、Df 代表载波频率的峰值偏向角、fmax 是调制子载波信号中最高(最大)频率。
A device for connecting a two-way mobile radio system to the telephone network invented by Thomas Carter. It was electrically connected to the base station of the mobile radio system. Its electrical parts were encased in bakelite. When someone on the radio wanted to speak on a "landline" (the phone system), the base station operator would dial the number on a separate phone then place the telephone handset on the Carterfone device. The handset was acoustically, not electrically, connected to the phone system. No more than 4,000 Carterfones were ever installed, yet the Bell System thought they were the most dangerous device ever invented. Tom Carter died in Gun Barrel, TX where he lived, in the early part of 1991. He died a poor man. See Carterfone Decision.
将双向无线移动系统与 Thomas Carter 发明的电话网络相连接的一种设备。该设备与无线移动系统的基站通过电路相连接。设备的电路部分被酚醛树脂包裹。当无线用户需要与“有线用户”(电话系统)通话时,基站操作员在一门独立的电话机上拨打该有线用户号码,然后将电话听筒放在 Carterfone 设备上。电话听筒是通过声信号而非电信号连接电话系统的。到目前为止曾经安装过的 Carterfone 设备不超过4000部,然而 Bell 系统认为这是迄今为止发明的最危险的一种设备。Tom Carter 于1991年初逝于德克萨斯州 Gun Barrel他的家中。死时穷困潦倒。参见 Carterfone Decision。
Carterfone Decision
In the summer of 1968 the FCC determined that the Carterfone and other customer phone devices could be connected to the nation's phone network — if they were "privately beneficial, but not publicly harmful." The Carterfone decision was a landmark. It allowed the connection of non-telephone company equipment to the public telephone network. This decision marked the beginning of the telephone interconnect business as we know it today. The Carterfone decision made a lot of lawyers rich before all the rules on connection to the network got cleared up, and finally codified in something called Part 68 of the FCC's Rules. See Carterfone, NATA and Network Harm.
Carterfone 决议
1968 年夏天,FCC 判决 Carterfone 与其它用户电话设备可以接入国家电话网络,如果这些公司属于“私人经营,对公益性电话公司利益不造成损害的话。Carterfone 决议从此成为一座里程碑。标志着非电话公司设备可以接入公共电话网络。这项决议标志着今天我们所熟知的电话互联业的开始。在将公共电话网络中所有连接规则进行清理,最终规整出一个叫做《FCC 规则第 68 章》的规范出台前,Carterfone 决议使大量律师因此致富。参见 Carterfone、NATA 和 Network Harm。