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1. 发明授权

US06898212B1 Systems and methods for controlling audible speech distortion in a GPS-based CDMA wireless network using ATM transport 失效
标题翻译：用于在基于GPS的CDMA无线网络中使用ATM传输来控制语音失真的系统和方法
公开(公告)号：US06898212B1
公开(公告)日：2005-05-24
申请号：US09713778
申请日：2000-11-14
申请人： Dexter Chun , Manoj Deshpande , Steve Hicks , Bob Knight , KC Lee , Ravi Palakodety , Ramesh Ramaswamy , Gustavo Serena , Dave Walker , Jun Zhang
发明人： Dexter Chun , Manoj Deshpande , Steve Hicks , Bob Knight , KC Lee , Ravi Palakodety , Ramesh Ramaswamy , Gustavo Serena , Dave Walker , Jun Zhang
IPC分类号： H04B7/26 , H04J3/06
CPC分类号： H04B7/2628
摘要： A Base Station Controller (BSC) that reduces the occurrence of audible noise in a Code Division Multiple Access (CDMA) radio network is provided. The BSC according to one embodiment of the present invention comprises a Media Stream Board (MSB) for compressing groups of 160 PCM speech samples from a Public Switch Telephone Network (PSTN) into vocoded frames, and a Special Purpose Board (SPB) for reformatting the vocoded frames from the MSB into over-the-air CDMA vocoded frames. The MSB and SPB each have a local timer that is slave to “PSTN time”. The BSC further comprises a Timing Unit Board (TUB) connected to a GPS receiver. The TUB receives “GPS time” from the GPS receiver. The TUB generates timing cells, each containing time-of-day information according to “GPS time”. The TUB distributes the timing cells to the MSB and the SPB over an Asynchronous Transfer Mode (ATM) network. The MSB and SPB use the received timing cells to compare their local timer, which tracks “PSTN time”, to “GPS time”. The MSB and the SPB realign their local timer with “GPS time” whenever their local timer drifts from “GPS time” outside of a predetermined time window.
摘要翻译：提供了一种在码分多址（CDMA）无线电网络中减少可听噪声的发生的基站控制器（BSC）。根据本发明的一个实施例的BSC包括用于将来自公共交换电话网（PSTN）的160个PCM语音样本的组压缩为声码帧的媒体流板（MSB），以及专用板（SPB），用于重新格式化从MSB到无线CDMA语音码帧的声码帧。 MSB和SPB每个都有一个本地定时器，从站到“PSTN时间”。 BSC还包括连接到GPS接收机的定时单元板（TUB）。 TUB从GPS接收机接收“GPS时间”。 TUB产生定时单元，每个单元包含根据“GPS时间”的日期信息。 TUB通过异步传输模式（ATM）网络将定时单元分配给MSB和SPB。 MSB和SPB使用接收到的定时单元将其“PSTN时间”跟踪的本地定时器与“GPS时间”进行比较。当本地定时器从预定时间窗口之外的“GPS时间”漂移时，MSB和SPB将其本地定时器重新对准“GPS时间”。

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