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1. 发明专利

BR0015044A 未知
公开(公告)号：BR0015044A
公开(公告)日：2002-06-18
申请号：BR0015044
申请日：2000-10-25
申请人： SCIENTIFIC ATLANTA
发明人： FARHAN FORREST M , QUESENBERRY PAUL E
IPC分类号： H04L12/28 , H03M1/08 , H03M7/50

2. 发明申请

WO0135588A3 ANALOGUE TO DIGITAL AND DIGITAL TO ANALOGUE CONVERSION FOR BROADBAND TRANSMISSION 审中-公开
标题翻译：数字和数字数字转换为宽带传输的模拟转换
公开(公告)号：WO0135588A3
公开(公告)日：2001-12-13
申请号：PCT/US0029399
申请日：2000-10-25
申请人： SCIENTIFIC ATLANTA
发明人： FARHAN FORREST M , QUESENBERRY PAUL E
IPC分类号： H04L12/28 , H03M1/08 , H03M7/50
CPC分类号： H04L12/2874 , H04L12/2801 , H04L2212/00
摘要： A broadband communication system (60), such as a cable television system, includes a forward path for transmitting information from headend equipment to subscribers and a reverse path for transmitting information from the subscribers to the headend equipment. The reverse path includes a transmitting station (65) that receives a first analog signal, converts the first analog signal to a first digital signal having a first number of bits, encodes the first digital signal to generate a second digital signal having a second number of bits less than the first number of bits, then optically transmits the second digital signal. A receiving station (70), also located in the reverse path, receives the second digital signal, decodes the second digital signal to generate a third digital signal having a third number of bits greater than the second number of bits, then converts the third digital signal to a second analog signal that approximates the first analog signal.
摘要翻译：诸如有线电视系统的宽带通信系统（60）包括用于从头端设备向用户发送信息的前向路径和用于从用户向头端设备发送信息的反向路径。反向路径包括接收第一模拟信号的发射台（65），将第一模拟信号转换为具有第一数位数的第一数字信号，对第一数字信号进行编码，以产生第二数字信号小于第一位数的位，然后光学地发送第二数字信号。也位于反向路径中的接收站（70）接收第二数字信号，对第二数字信号进行解码以产生具有大于第二位数的第三位数的第三数字信号，然后将第三数字信号信号到接近第一模拟信号的第二模拟信号。

3. 发明申请

WO0239733A2 FREQUENCY AGILE ADAPTIVE AUTOMATIC GAIN CONTROL CIRCUIT 审中-公开
标题翻译：频率敏捷自适应增益控制电路
公开(公告)号：WO0239733A2
公开(公告)日：2002-05-16
申请号：PCT/US0151125
申请日：2001-10-19
申请人： SCIENTIFIC ATLANTA
发明人： AL-ARAJI SALEH R , QUESENBERRY PAUL E , PATTERSON DALE
IPC分类号： H04N7/10 , H04N17/00 , H04N5/52
CPC分类号： H04N7/102 , H04N17/00
摘要： An amplifier (125) includes at least one gain stage (210) for amplifying a signal received by the amplifier (125). The amplifier (125) also includes an AGC circuit (400, 500) that adjusts the amplification of the gain stage (210). The AGC circuit (400, 500) determines whether the input signal to the amplifier (125) is a digital signal or an analog signal and transforms either signal into the frequency domain, thereby automatically adjusts the processing method depending upon the type of pilot carrier signal. The AGC circuit (400, 500) also possesses the ability to process a change in the frequency of a pilot carrier signal remotely.
摘要翻译：放大器（125）包括用于放大由放大器（125）接收的信号的至少一个增益级（210）。放大器（125）还包括调整增益级（210）的放大的AGC电路（400,500）。 AGC电路（400,500）确定到放大器（125）的输入信号是数字信号还是模拟信号并将任一信号转换到频域，从而根据导频载波信号的类型自动调整处理方法。 AGC电路（400,500）还具有远程处理导频载波信号的频率变化的能力。

4. 发明申请

WO0178391A3 DISTORTION MONITORING SYSTEM FOR CATV TRANSMISSION NETWORKS 审中-公开
标题翻译：有线电视传输网络故障监控系统
公开(公告)号：WO0178391A3
公开(公告)日：2002-02-07
申请号：PCT/US0111193
申请日：2001-04-05
申请人： SCIENTIFIC ATLANTA
发明人： AL-ARAJI SALEH R , QUESENBERRY PAUL E , KRUSE HERMAN A
IPC分类号： H04N7/10 , H04N17/00
CPC分类号： H04N17/00 , H04N7/10
摘要： Systems and methods for a distortion monitoring system that detects an abnormal amount of signal distortion occurring in a transmission system. The distortion monitoring system includes a system amplifier section (28) for amplifying (34) and coupling (32) an input signal to provide first and second (38) outputs and a distortion monitoring section (29) for processing the second output. The amount of distortion present is represented by an output from the distortion monitoring section (29) of the system. In one embodiment, the distortion monitoring section can include an envelope detector (40) for receiving the second output signal (38), a lowpass filter (44) coupled to the envelope detector for cutting off frequencies below the Nyquist rate, and a voltage amplifier coupled to the lowpass filter for amplifying the signal. An analog to digital converter (48) coupled to the voltage amplifier digitizes the signal, a memory buffer (52) coupled to the analog to digital converter captures the digital data from the analog to digital converter, and a digital signal processor (54) extracts the converted signal. In yet another embodiment, the digital signal processor (54) includes an on-chip memory. A status monitor coupled to the output of the distortion monitoring section (29) provides for monitoring the output signal.
摘要翻译：用于检测在传输系统中发生的异常信号失真量的失真监视系统的系统和方法。失真监测系统包括用于放大（34）并耦合（32）输入信号以提供第一和第二（38）输出的系统放大器部分（28）和用于处理第二输出的失真监测部分（29）。存在的失真量由系统的失真监视部分（29）的输出表示。在一个实施例中，失真监测部分可以包括用于接收第二输出信号（38）的包络检测器（40），耦合到包络检测器的低通滤波器（44），用于切断低于奈奎斯特速率的频率，以及电压放大器耦合到用于放大信号的低通滤波器。耦合到电压放大器的模数转换器（48）对信号进行数字化，耦合到模数转换器的存储器缓冲器（52）捕获来自模数转换器的数字数据，并且数字信号处理器（54）提取转换信号。在另一个实施例中，数字信号处理器（54）包括片上存储器。耦合到失真监测部分（29）的输出的状态监视器提供监视输出信号。

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