公开(公告)号：US06574280B1

公开(公告)日：2003-06-03

申请号：US09361872

申请日：1999-07-27

申请人： Thomas Liau ,  Jason Brent ,  Zhenyu Zhou

发明人： Thomas Liau ,  Jason Brent ,  Zhenyu Zhou

IPC分类号： H04B1404

CPC分类号： H04L25/4927 ,  H04L29/06 ,  H04L69/24 ,  H04M11/06

摘要： An initialization procedure for a digital modem system treats the presence of ADPCM as if it were a digital impairment such that the modem system can utilize effective compensation techniques to address the ADPCM. The modem system initially determines whether the current communication channel is a fully digital channel. Next, the modem system determines whether the channel includes any ADPCM elements. If ADPCM is detected, then a digital impairment learning routine is performed to obtain the ADPCM compression characteristics and data rate. The digital impairment learning routine may use a single probing sequence to obtain the ADPCM characteristics while identifying any concurrent digital impairments such as RBS, digital pads, and encoding law conversions. Once the digital channel is characterized, the modem system may condition its transmitters and receivers in an appropriate manner to obtain an increased data rate.

摘要翻译： 数字调制解调器系统的初始化程序将ADPCM的存在视为数字损害，使得调制解调器系统可以利用有效的补偿技术来解决ADPCM。 调制解调器系统最初确定当前通信信道是否是完全数字信道。 接下来，调制解调器系统确定信道是否包括任何ADPCM元素。 如果检测到ADPCM，则执行数字损伤学习程序以获得ADPCM压缩特性和数据速率。 数字损伤学习程序可以使用单个探测序列来获得ADPCM特征，同时识别任何并发的数字损伤，例如RBS，数字焊盘和编码法则转换。 一旦数字信道被表征，调制解调器系统可以以适当的方式调节其发射机和接收机以获得增加的数据速率。