-
公开(公告)号：US06628780B2
公开(公告)日：2003-09-30
申请号：US08961901
申请日：1997-10-31
IPC分类号： H04M100
CPC分类号： H04B3/23
摘要： A network-based CODEC (coder-decoder) includes an echo canceler. This CODEC recognizes the presence of a data call by detecting predefined signaling portions of a modem handshaking process. For each detected data call, the CODEC uses a stored channel model for performing echo cancellation during the data call. The CODEC trains off-line during selected segments of the modem call and then stores the new channel model for use in a future data call.
摘要翻译： 基于网络的CODEC（编解码器）包括回波消除器。 该CODEC通过检测调制解调器握手过程的预定义的信令部分来识别数据呼叫的存在。 对于每个检测到的数据呼叫，CODEC使用存储的信道模型来在数据呼叫期间执行回波消除。 CODEC在调制解调器呼叫的选定段期间离线运行，然后存储新的频道模型以供将来的数据呼叫使用。
-
公开(公告)号：US5982950A
公开(公告)日：1999-11-09
申请号：US331168
申请日：1994-10-28
CPC分类号： G06K7/10851
摘要： A method and system for acquiring an optical target affixed to a surface of a package with an optical scanning device. Height information associated with the height of the surface of the package is sensed and a height signal representative of a scanning distance between the optical target and the optical scanning device is generated. The package surface is scanned with the optical scanning device to generate an optical target input signal. The optical target input signal is converted in accordance with a first sampling frequency to provide a converted input signal, and a second resampling frequency is adjusted in accordance with the height signal. The converted input signal is reconverted in accordance with the second resampling frequency to generate a frequency shifted optical target signal, and the optical target on the surface of the package is acquired in accordance with the frequency shifted optical target signal.
摘要翻译： 一种用光学扫描装置获取附着在包装表面上的光学靶的方法和系统。 感测与包装表面的高度相关联的高度信息，并且生成表示光学对象和光学扫描装置之间的扫描距离的高度信号。 用光学扫描装置扫描封装表面以产生光学目标输入信号。 光学目标输入信号根据第一采样频率被转换以提供转换的输入信号，并且根据高度信号调整第二重采样频率。 转换的输入信号根据第二重采样频率再转换以产生频移光学目标信号，并且根据频移光学目标信号获取包装表面上的光学目标。
-
搜索结果
2 条记录 (耗时 0.011 秒)