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1. 发明授权

US07283584B2 Direct digital access arrangement circuitry and method for connecting to phone lines 失效
公开(公告)号：US07283584B2
公开(公告)日：2007-10-16
申请号：US10780142
申请日：2004-02-17
申请人： Jeffrey W. Scott , Navdeep S. Sooch , David R. Welland
发明人： Jeffrey W. Scott , Navdeep S. Sooch , David R. Welland
IPC分类号： H04B1/38 , H04L5/16
CPC分类号： H04M1/573 , H04L7/033 , H04L25/0266 , H04L25/06 , H04M1/76 , H04M3/007 , H04M11/06 , H04M19/001 , H04M19/02
摘要： An isolation system is provided that is suitable for use in telephony, medical instrumentation, industrial process control and other applications. Preferred embodiments of the invention comprise a capacitive isolation barrier across which a digital signal is communicated. The system provides a means of communication across the isolation barrier that is highly immune to amplitude and phase noise interference. Clock recovery circuitry may be employed on one side of the isolation barrier to extract timing information from the digital signal communicated across the barrier, and to filter the effects of phase noise introduced at the barrier. Delta-sigma converters may be disposed on both sides of the isolation barrier to convert signals between analog and digital domains. An isolated power supply may also be provided on the isolated side of the barrier, whereby direct current is generated in response to the digital data received across the isolation barrier. Finally, a bidirectional isolation system is provided whereby bidirectional communication of digital signals is accomplished using a single pair of isolation capacitors. In preferred embodiments, the digital data communicated across the barrier consists of digital delta-sigma data signals multiplexed in time with other digital control, signaling and framing information.

2. 发明授权

US07072389B2 Direct digital access arrangement circuitry and method for connecting to phone lines 失效
公开(公告)号：US07072389B2
公开(公告)日：2006-07-04
申请号：US10227104
申请日：2002-08-23
申请人： Jeffrey W. Scott , Navdeep S Sooch , David R. Welland
发明人： Jeffrey W. Scott , Navdeep S Sooch , David R. Welland
IPC分类号： H04B1/38 , H04L5/16
CPC分类号： H04M1/573 , H04L7/033 , H04L25/0266 , H04L25/06 , H04M1/76 , H04M3/007 , H04M11/06 , H04M19/001 , H04M19/02
摘要： An isolation system is provided that is suitable for use in telephony, medical instrumentation, industrial process control and other applications. Preferred embodiments of the invention comprise a capacitive isolation barrier across which a digital signal is communicated. The system provides a means of communication across the isolation barrier that is highly immune to amplitude and phase noise interference. Clock recovery circuitry may be employed on one side of the isolation barrier to extract timing information from the digital signal communicated across the barrier, and to filter the effects of phase noise introduced at the barrier. Delta-sigma converters may be disposed on both sides of the isolation barrier to convert signals between analog and digital domains. An isolated power supply may also be provided on the isolated side of the barrier, whereby direct current is generated in response to the digital data received across the isolation barrier. Finally, a bidirectional isolation system is provided whereby bidirectional communication of digital signals is accomplished using a single pair of isolation capacitors. In preferred embodiments, the digital data communicated across the barrier consists of digital delta-sigma data signals multiplexed in time with other digital control, signaling and framing information.

3. 发明授权

US07046755B2 Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with switchable time constants 有权
标题翻译：用于连接到具有可切换时间常数的DC保持电路的电话线的数字接入配置电路和方法
公开(公告)号：US07046755B2
公开(公告)日：2006-05-16
申请号：US10679046
申请日：2003-10-03
申请人： Timothy J. Dupuis , George Tyson Tuttle , Jeffrey W. Scott , Navdeep S. Sooch , David R. Welland
发明人： Timothy J. Dupuis , George Tyson Tuttle , Jeffrey W. Scott , Navdeep S. Sooch , David R. Welland
IPC分类号： H04L23/00
CPC分类号： H04L25/06 , H04L7/033 , H04L25/0266 , H04M11/06 , H04M19/001
摘要： A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end that provides a communication path for signals to and from the phone lines. Briefly described, the DAA provides a programmable means for the DC termination for a variety of international phone standards. The invention may also be utilized with means for transmitting and receiving a signal across a capacitive isolation barrier. More particularly, a DC holding circuit is provided in which a programmable DC current limiting mode is available. In the current limiting mode, power may be dissipated in devices external to a DAA integrated circuit. Moreover, much of the power may be dissipated in external passive devices, such as resistors.
摘要翻译：可以使用数字直接访问布置（DAA）电路来终止在用户端的电话连接，其提供用于到达和来自电话线的信号的通信路径。简要描述，DAA提供用于各种国际电话标准的DC终端的可编程装置。本发明还可以用于在电容隔离屏障上传输和接收信号的装置。更具体地，提供了一种DC可编程直流限流模式可用的直流保持电路。在限流模式下，功率可能会在DAA集成电路外部的器件中耗散。此外，大部分功率可能会在外部无源器件（如电阻）中消散。

4. 发明授权

US06975723B2 Architecture for minimum loop current during ringing and caller ID 失效
标题翻译：振铃期间最小回路电流的结构和来电显示
公开(公告)号：US06975723B2
公开(公告)日：2005-12-13
申请号：US10429795
申请日：2003-05-05
申请人： Jeffrey W. Scott , Navdeep S. Sooch , David R. Welland , Jerrell P. Hein , Andrew W. Krone
发明人： Jeffrey W. Scott , Navdeep S. Sooch , David R. Welland , Jerrell P. Hein , Andrew W. Krone
IPC分类号： H03M1/42 , H04L7/033 , H04L25/02 , H04L25/06 , H04M1/57 , H04M11/06 , H04M19/00 , H04M19/02 , H04M1/00 , H04M9/00
CPC分类号： H04M1/573 , H04L7/033 , H04L25/0266 , H04L25/06 , H04M11/06 , H04M19/001 , H04M19/02
摘要： A communication system is provided which draws virtually no loop current during a ringing burst and only draws on-hook loop current during the caller ID field. More particularly, ringer burst circuitry may be powered from the user powered circuitry by the transmission of power across the isolation barrier rather than being powered from the phone line. Thus, loop current need not be drawn from the TIP/RING lines during ringer bursts. The isolation barrier may be a capacitive isolation barrier which allows bidirectional communication and extraction of power from signals transmitted across the barrier.
摘要翻译：提供一种通信系统，其在振铃突发期间几乎不消除环路电流，并且仅在呼叫者ID字段期间吸引挂机环路电流。更具体地，振铃突发电路可以由用户供电的电路通过跨隔离屏障的功率传输而不是从电话线供电。因此，在振铃器脉冲串期间，不需要从TIP / RING线路中抽出回路电流。隔离屏障可以是电容隔离屏障，其允许通过屏障传输的信号的双向通信和功率提取。

5. 发明授权

US06823066B1 Digital access arrangement circuitry and method having current ramping control of the hookswitch 失效
公开(公告)号：US06823066B1
公开(公告)日：2004-11-23
申请号：US09347689
申请日：1999-07-02
申请人： George Tyson Tuttle , Jeffrey W. Scott , Navdeep S. Sooch , David R. Welland
发明人： George Tyson Tuttle , Jeffrey W. Scott , Navdeep S. Sooch , David R. Welland
IPC分类号： H04M100
CPC分类号： H04L25/0266 , H04L7/033 , H04L25/06 , H04M11/06 , H04M19/001
摘要： A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end to provide a communication path for signals to and from the phone lines. Briefly described, a means for providing a proper hookswitch transition for a variety of international phone standards is provided. The invention may also be utilized with means for transmitting and receiving a signal across a capacitive isolation barrier. More particularly, a DAA circuitry may be utilized which satisfies many or all hookswitch transition standards without the use of additional discrete devices. The hookswitch transition standards may be satisfied by ramping down the current flowing through the hookswitch prior to transitioning the hookswitch state. In this manner the hookswitch current change as a function of time (di/dt) may be decreased. Thus, the current through the hookswitch may be actively controlled prior to switching the hookswitch from an off-hook condition to an on-hook condition. By controlling the current drawn from the phone lines through the hookswitch, the maximum voltage seen at the phone company exchange may be decreased.

6. 发明授权

US06611553B1 Isolation system with digital communication across a capacitive barrier 失效
公开(公告)号：US06611553B1
公开(公告)日：2003-08-26
申请号：US09591684
申请日：2000-06-09
申请人： Jeffrey W. Scott , Navdeep S. Sooch , David R. Welland
发明人： Jeffrey W. Scott , Navdeep S. Sooch , David R. Welland
IPC分类号： H04M318
CPC分类号： H04L25/0266 , H04L7/033 , H04L25/06 , H04M11/06
摘要： An isolation system is provided that is suitable for use in telephony, medical instrumentation, industrial process control and other applications. Preferred embodiments of the invention comprise a capacitive isolation barrier across which a digital signal is communicated. The system provides a means of communication across the isolation barrier that is highly immune to amplitude and phase noise interference. Clock recovery circuitry may be employed on one side of the isolation barrier to extract timing information from the digital signal communicated across the barrier, and to filter the effects of phase noise introduced at the barrier. Delta-sigma converters may be disposed on both sides of the isolation barrier to convert signals between analog and digital domains. An isolated power supply may also be provided on the isolated side of the barrier, whereby direct current is generated in response to the digital data received across the isolation barrier. Finally, a bidirectional isolation system is provided whereby bidirectional communication of digital signals is accomplished using a single pair of isolation capacitors. In preferred embodiments, the digital data communicated across the barrier consists of digital delta-sigma data signals multiplexed in time with other digital control, signaling and framing information.

7. 发明授权

US06442271B1 Digital isolation system with low power mode 失效
标题翻译：低功耗模式的数字隔离系统
公开(公告)号：US06442271B1
公开(公告)日：2002-08-27
申请号：US09034621
申请日：1998-03-04
申请人： George Tyson Tuttle , Jerrell P. Hein , Timothy J. Dupuis , Jeffrey W. Scott , Navdeep S. Sooch , David R. Welland
发明人： George Tyson Tuttle , Jerrell P. Hein , Timothy J. Dupuis , Jeffrey W. Scott , Navdeep S. Sooch , David R. Welland
IPC分类号： H04M100
CPC分类号： H04L25/06 , H04L7/033 , H04L25/0266 , H04M1/573 , H04M11/06 , H04M19/001 , H04M19/02
摘要： A method and apparatus are provided for maintaining communication across an isolation barrier even if the external circuitry to which it is connected enters a low-power mode. In normal operation the isolation barrier local clock is synchronized with a clock signal provided by the external circuitry. If the external circuitry enters a low-power mode, its clock signal often slows or stops. In that case, the local clock in the isolation barrier switches to a free-running mode, wherein a VCO voltage input is provided by a bias voltage generator instead of by a PLL circuit. The VCO thus continues to provide a local clock signal in order to allow communication of information across the isolation barrier even if the external circuitry is not active. This enables the isolation barrier to receive and process an external signal, such as a ring signal, in low-power mode. Means are provided for causing the external circuitry to “wake up” in the event that a ring or other signal is detected by the isolation system, at which time the system resumes normal operation.
摘要翻译：提供了一种用于在隔离屏障上保持通信的方法和装置，即使其所连接的外部电路进入低功率模式。在正常操作中，隔离栅本地时钟与由外部电路提供的时钟信号同步。如果外部电路进入低功耗模式，则其时钟信号通常会减慢或停止。在这种情况下，隔离栅中的本地时钟切换到自由运行模式，其中VCO电压输入由偏置电压发生器而不是由PLL电路提供。因此，VCO因此继续提供本地时钟信号，以便即使外部电路不活动，也可以跨隔离屏障通信信息。这使得隔离屏障能够在低功率模式下接收和处理外部信号，例如振铃信号。提供了在隔离系统检测到环或其他信号的情况下使外部电路“唤醒”的装置，此时系统恢复正常操作。

8. 发明授权

US06389134B1 Call progress monitor circuitry and method for a communication system 失效
标题翻译：呼叫通信系统的进度监视电路和方法
公开(公告)号：US06389134B1
公开(公告)日：2002-05-14
申请号：US09035779
申请日：1998-03-04
申请人： Timothy J. Dupuis , George Tyson Tuttle , Jeffrey W. Scott , Navdeep S. Sooch , David R. Welland
发明人： Timothy J. Dupuis , George Tyson Tuttle , Jeffrey W. Scott , Navdeep S. Sooch , David R. Welland
IPC分类号： H04M100
CPC分类号： H04L25/06 , H04L7/033 , H04L25/0266 , H04M1/573 , H04M11/06 , H04M19/001 , H04M19/02
摘要： A call progress monitor circuit is disclosed for a digital DAA in which digital information is transmitted across an isolation barrier from phone line side circuitry to powered side circuitry. In particular, the call progress monitor circuit of the present invention converts oversampled digital transmit and receive data into analog transmit and receive signals and then combines them to produce a call progress signal that is provided to be fed to a speaker driver circuit. In addition, the call progress signal in one embodiment is filtered with a low pass filter. The call progress monitor circuit in one embodiment includes oversampled digital-to-analog converters, a summing circuit, and a low pass filter. Corresponding methods for monitoring the progress of a call utilizing oversampled digital transmit and receive signals are also disclosed.
摘要翻译：公开了一种用于数字DAA的呼叫进程监视电路，其中数字信息通过隔离屏障从电话线侧电路传输到电源侧电路。特别地，本发明的呼叫进程监视电路将过采样的数字发送和接收数据转换为模拟发送和接收信号，然后将它们组合以产生提供给馈送到扬声器驱动器电路的呼叫进行信号。此外，一个实施例中的呼叫进程信号用低通滤波器滤波。一个实施例中的呼叫进程监视电路包括过采样的数模转换器，加法电路和低通滤波器。还公开了用于监视利用过采样数字发射和接收信号的呼叫进展的相应方法。

9. 发明授权

US5870046A Analog isolation system with digital communication across a capacitive barrier 失效
公开(公告)号：US5870046A
公开(公告)日：1999-02-09
申请号：US837702
申请日：1997-04-22
申请人： Jeffrey W. Scott , Navdeep S. Sooch , David R. Welland
发明人： Jeffrey W. Scott , Navdeep S. Sooch , David R. Welland
IPC分类号： H04B14/06 , H04L7/033 , H04L25/06 , H04M11/06 , H03M3/02
CPC分类号： H04B14/062 , H04L25/0266 , H04L25/06 , H04M11/06 , H04L7/033
摘要： An isolation system is provided that is suitable for use in telephony, medical instrumentation, industrial process control and other applications. Preferred embodiments of the invention comprise a capacitive isolation barrier across which a digital signal is communicated. The system provides a means of communication across the isolation barrier that is highly immune to amplitude and phase noise interference. Clock recovery circuitry may be employed on one side of the isolation barrier to extract timing information from the digital signal communicated across the barrier, and to filter the effects of phase noise introduced at the barrier. Delta-sigma converters may be disposed on both sides of the isolation barrier to convert signals between analog and digital domains. An isolated power supply may also be provided on the isolated side of the barrier, whereby direct current is generated in response to the digital data received across the isolation barrier. Finally, a bidirectional isolation system is provided whereby bidirectional communication of digital signals is accomplished using a single pair of isolation capacitors. In preferred embodiments, the digital data communicated across the barrier consists of digital delta-sigma data signals multiplexed in time with other digital control, signaling and framing information.

10. 发明授权

US07463675B2 Direct digital access arrangement circuitry and method for connecting to phone lines 失效
标题翻译：用于连接到电话线的直接数字接入安排电路和方法
公开(公告)号：US07463675B2
公开(公告)日：2008-12-09
申请号：US11398090
申请日：2006-04-05
申请人： Jeffrey W. Scott , Navdeep S. Sooch , David R. Welland
发明人： Jeffrey W. Scott , Navdeep S. Sooch , David R. Welland
IPC分类号： H04B1/38 , H04L5/16
CPC分类号： H04M1/573 , H04L7/033 , H04L25/0266 , H04L25/06 , H04M1/76 , H04M3/007 , H04M11/06 , H04M19/001 , H04M19/02
摘要： An isolation system is provided that is suitable for use in telephony, medical instrumentation, industrial process control and other applications. Preferred embodiments of the invention comprise a capacitive isolation barrier across which a digital signal is communicated. The system provides a means of communication across the isolation barrier that is highly immune to amplitude and phase noise interference. Clock recovery circuitry may be employed on one side of the isolation barrier to extract timing information from the digital signal communicated across the barrier, and to filter the effects of phase noise introduced at the barrier. Delta-sigma converters may be disposed on both sides of the isolation barrier to convert signals between analog and digital domains. An isolated power supply may also be provided on the isolated side of the barrier, whereby direct current is generated in response to the digital data received across the isolation barrier. Finally, a bidirectional isolation system is provided whereby bidirectional communication of digital signals is accomplished using a single pair of isolation capacitors. In preferred embodiments, the digital data communicated across the barrier consists of digital delta-sigma data signals multiplexed in time with other digital control, signaling and framing information.
摘要翻译：提供了一种适用于电话，医疗仪器，工业过程控制和其他应用的隔离系统。本发明的优选实施例包括电容隔离屏障，通过数字信号传送数字信号。该系统提供跨越隔离屏障的通信手段，其高度免疫幅度和相位噪声干扰。可以在隔离屏障的一侧采用时钟恢复电路，从跨屏障通信的数字信号提取定时信息，并且滤除在屏障处引入的相位噪声的影响。 Δ-Σ转换器可以设置在隔离屏障的两侧以在模拟和数字域之间转换信号。隔离电源也可以设置在屏障的隔离侧上，由此响应于穿过隔离屏障接收的数字数据产生直流电流。最后，提供双向隔离系统，由此使用单对隔离电容器实现数字信号的双向通信。在优选实施例中，跨屏障通信的数字数据由与其他数字控制，信令和成帧信息在时间上多路复用的数字delta-sigma数据信号组成。

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