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1. 发明授权

US5754592A Method and apparatus for randomized oversampling 失效
标题翻译：随机抽样方法和装置
公开(公告)号：US5754592A
公开(公告)日：1998-05-19
申请号：US678882
申请日：1996-07-02
申请人： Mark B. Flowers , John A. C. Bingham , Michael D. Agah
发明人： Mark B. Flowers , John A. C. Bingham , Michael D. Agah
IPC分类号： H03M1/08 , H03M1/12 , H03M1/66 , H04B14/04 , H03M1/10
CPC分类号： H03M1/0854 , H04B14/046 , H03M1/12 , H03M1/66
摘要： An oversampling technique that improves signal-to-quantization noise ratio without requiring substantial amounts of processing power is disclosed. The oversampling technique determines the oversample values by successively scaling the previous value using a scaling factor. The effect of the invention is the randomize the quantization error for each of the oversample values so that the quantization error becomes uncorrelated from one oversample value to the next. When such decorrelation occurs, the quantization noise is spread over the enlarged frequency band associated with the oversampling. The invention is applicable to any transmission scheme which utilizes oversampling and digital-to-analog conversion.
摘要翻译：公开了一种在不需要大量处理能力的情况下提高信号到量化噪声比的过采样技术。过采样技术通过使用缩放因子连续缩放先前值来确定过采样值。本发明的效果是随机化每个过采样值的量化误差，使得量化误差从一个过采样值到下一个过采样值变得不相关。当发生这种去相关时，量化噪声在与过采样相关联的放大频带上扩展。本发明适用于利用过采样和数模转换的任何传输方案。

2. 发明授权

US07184467B2 Method to mitigate effects of ISDN off/on transitions in ADSL 有权
标题翻译：减轻ADSL中ISDN脱离/转换影响的方法
公开(公告)号：US07184467B2
公开(公告)日：2007-02-27
申请号：US10294402
申请日：2002-11-14
申请人： Krista S. Jacobsen , Michael D. Agah , Brian R. Wiese
发明人： Krista S. Jacobsen , Michael D. Agah , Brian R. Wiese
IPC分类号： H04B1/38
CPC分类号： H04L5/006 , H04L5/0007 , H04L5/0046 , H04M11/062
摘要： The present invention provides for a method and apparatus for allocating data to subchannels used for ADSL transmission over a communication link which supports further system transmissions. An expected interference impact from the further system transmissions is estimated for the ADSL subchannels. Signal-to-noise ratios (SNRs) for the subchannels are determined for bit loading by an estimator (220). In one embodiment, actual noise associated with the communication link is used at initialization to determine a SNR which is subsequently modified by an adjusting unit (205) prior to bit loading responsive to the estimated interference impact. In another embodiment, a virtual noise signal, indicative of the estimated interference impact and generated by a noise signal generator (235), is summed with the actual noise prior to determining a SNR for bit loading. Prior to transmitting, the data is allocated to the subchannels by a bit loader (210) based on respective SNRs modified responsive the estimated interference impact.
摘要翻译：本发明提供了一种用于将数据分配到用于通过支持进一步系统传输的通信链路进行ADSL传输的子信道的数据的方法和装置。对于ADSL子信道估计来自进一步的系统传输的预期的干扰影响。确定子通道的信噪比（SNR）由估计器（220）进行位加载。在一个实施例中，在初始化时使用与通信链路相关联的实际噪声来确定随后在响应于所估计的干扰影响的比特加载之前由调整单元（205）修改的SNR。在另一个实施例中，在确定用于比特加载的SNR之前，将表示所估计的干扰影响并由噪声信号发生器（235）产生的虚拟噪声信号与实际噪声相加。在发送之前，基于响应于估计的干扰影响而修改的相应SNR，由比特加载器（210）将数据分配给子信道。

3. 发明授权

US5003573A Self-diagnosis of loop start and ground start trunk interfaces 失效
标题翻译：环路启动和接地启动中继接口的自诊断
公开(公告)号：US5003573A
公开(公告)日：1991-03-26
申请号：US508865
申请日：1990-04-12
申请人： Michael D. Agah , Michael E. Locke
发明人： Michael D. Agah , Michael E. Locke
IPC分类号： H04M3/26 , H04M1/24 , H04M3/28 , H04M7/00
CPC分类号： H04M3/28 , H04M1/24 , H04M7/0096
摘要： Method and apparatus for sectionalization and self-diagnosis of loop start and ground start trunk interfaces without intervention from host telephone company equipment. The inventive method entails the use of an isolation relay in the trunk circuit to isolate the trunk circuit electrically from the physical medium and to apply various signals to portions of the isolated trunk circuit to carry out specific self-diagnostic tests.

4. 发明授权

US06370187B1 Adaptive power dissipation for data communications system 失效
标题翻译：数据通信系统的自适应功耗
公开(公告)号：US06370187B1
公开(公告)日：2002-04-09
申请号：US09053192
申请日：1998-04-01
申请人： Michael D. Agah
发明人： Michael D. Agah
IPC分类号： H04L516
CPC分类号： H04L27/0002
摘要： A high performance data communications system (e.g., modem, transceiver, etc.) that has improved control over power dissipation is disclosed. The data communications system allows its power dissipation to be adaptively controlled so as to provide substantially improved control over the power dissipation of the data communications system than has been conventionally possible. The control over power dissipation can be performed only on transmissions, only on receptions, or on both transmissions and receptions. By suitably controlling the power dissipation, the power dissipation of the data communications system can be substantially reduced at lower power settings, while still supporting the higher power settings.
摘要翻译：公开了一种改善了对功耗的控制的高性能数据通信系统（例如，调制解调器，收发器等）。数据通信系统允许其功率消耗被自适应地控制，以便提供比传统可能的对数据通信系统的功率耗散的显着改进的控制。功耗的控制只能在传输，仅在接收或传输和接收两种情况下进行。通过适当地控制功率消耗，数据通信系统的功耗可以在较低的功率设置下显着降低，同时仍然支持较高的功率设置。

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