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1. 发明授权

US06763107B1 Method and apparatus for reducing distortion in a line powered modulator circuit 失效
标题翻译：用于减少线路供电调制器电路中的失真的方法和装置
公开(公告)号：US06763107B1
公开(公告)日：2004-07-13
申请号：US09431913
申请日：1999-11-02
申请人： Jonathan Herman Fischer , Keith Eugene Hollenbach , Donald Raymond Laturell , Lane A. Smith , Weilin Zhu
发明人： Jonathan Herman Fischer , Keith Eugene Hollenbach , Donald Raymond Laturell , Lane A. Smith , Weilin Zhu
IPC分类号： H04M900
CPC分类号： H04M19/001
摘要： A method and apparatus for a telephone line interface or data access arrangement (DAA) which includes a shunt regulator in series with a line modulator. A sense resistor is placed in series between the shunt regulator and the line modulator to provide a measurement of the amount of current distortion in the DAA. The line modulator contains a Darlington pair which reduces the amount of current drawn by the line modulator, allowing the sense resistor to sense a majority of the system current. The voltage across the sense resistor is fed back to the line modulator. The line modulator is capable of adjusting the AC modulation and the DC termination presented to the telephone line. The method includes drawing power from the telephone line using a shunt regulator, modulating the telephone line in series with the shunt regulator, sensing a level of distortion in the DAA, and feeding the sensed level of distortion to the line modulator.
摘要翻译：一种用于电话线接口或数据访问装置（DAA）的方法和装置，其包括与线路调制器串联的分流调节器。在分流调节器和线路调制器之间串联一个检测电阻，以提供DAA中电流失真量的测量。线路调制器包含一个达林顿对，减少线路调制器吸收的电流量，允许检测电阻感测系统电流的大部分。检测电阻两端的电压反馈到线路调制器。线路调制器能够调整AC调制和提供给电话线的DC终端。该方法包括使用分流调节器从电话线中抽取功率，调制与分流调节器串联的电话线，感测DAA中的失真水平，以及将感测到的失真电平馈送到线路调制器。

2. 发明授权

US06665403B1 Digital gyrator 失效
标题翻译：数字旋转器
公开(公告)号：US06665403B1
公开(公告)日：2003-12-16
申请号：US09310021
申请日：1999-05-11
申请人： Jonathan Herman Fischer , Donald Raymond Laturell , Lane A. Smith
发明人： Jonathan Herman Fischer , Donald Raymond Laturell , Lane A. Smith
IPC分类号： H04M100
CPC分类号： H04M19/001 , H04M1/738
摘要： A digital device for controlling the DC line current on a telephone line which includes a digital device that utilizes a digital filter for setting the DC line current. By controlling the DC line current digitally, software can be used to set the DC line current in accordance with predefined characteristics. Predefined characteristics can be set to accommodate varying country specifications instead of using switches to control resistors and capacitors. In addition, changes in a country's requirements can be accomplished through software, instead of changing components or redesigning a circuit board. The device also incorporates a method for maintaining DC current level during changes in digital filter characteristics. The use of software results in increased flexibility by allowing an infinite number of settings via software or software updates, and allowing changes to be made quickly and easily throughout the world.
摘要翻译：一种用于控制电话线路上的直流线路电流的数字装置，其包括利用数字滤波器设置直流线路电流的数字装置。通过数字控制直流线路电流，可以使用软件根据预定义的特性设置直流线路电流。预定义的特性可以设置为适应不同的国家规范，而不是使用开关来控制电阻和电容。另外，一个国家要求的变化可以通过软件来实现，而不是改变组件或重新设计电路板。该器件还包括在数字滤波器特性变化期间维持直流电流水平的方法。使用软件可以通过软件或软件更新实现无限数量的设置，从而提高灵活性，并允许在全球范围内快速，轻松地进行更改。

3. 发明授权

US06553118B1 Method and apparatus for calculating DC offset in a digital gyrator 失效
标题翻译：用于计算数字旋转器中的直流偏移的方法和装置
公开(公告)号：US06553118B1
公开(公告)日：2003-04-22
申请号：US09378771
申请日：1999-08-20
申请人： Lane A. Smith , Steven Brooke Witmer , Jonathan Herman Fischer , Donald Raymond Laturell
发明人： Lane A. Smith , Steven Brooke Witmer , Jonathan Herman Fischer , Donald Raymond Laturell
IPC分类号： H04M900
CPC分类号： H04M1/738 , H04M19/001
摘要： A method and apparatus for controlling the DC line current on a telephone line and reducing the amount of error introduced to the system. The error is reduced by compensating for a DC error term introduced by an analog to digital converter having a DC offset. The DC offset is controlled digitally, allowing software to be used to limit the DC error in accordance with predefined parameters. Predefined parameters can be set to accommodate varying country specifications instead of using switches to control resistors and capacitors. In addition, changes in a country's requirements can be accomplished through software, instead of changing components or redesigning a circuit board. The use of software results in increased flexibility by allowing an infinite number of settings via software or software updates, allowing changes to be made quickly and easily throughout the world, and allowing error terms to be accommodated digitally.
摘要翻译：一种用于控制电话线上的直流线路电流并减少引入系统的误差量的方法和装置。通过补偿由具有DC偏移的模数转换器引入的DC误差项来减小误差。 DC偏移受数字控制，允许软件根据预定义的参数来限制直流误差。可以设置预定义参数以适应不同的国家规格，而不是使用开关来控制电阻器和电容器。另外，一个国家要求的变化可以通过软件来实现，而不是改变组件或重新设计电路板。使用软件可以通过软件或软件更新实现无限数量的设置，从而提高灵活性，允许在全球范围内快速，轻松地进行更改，并允许数字化地容纳错误条款。

4. 发明授权

US06215429B1 Distributed gain for audio codec 有权
标题翻译：音频编解码器的分布式增益
公开(公告)号：US06215429B1
公开(公告)日：2001-04-10
申请号：US09232221
申请日：1999-01-19
申请人： Jonathan Herman Fischer , Donald Raymond Laturell , Lane A. Smith , Paul David Hendricks , James M. Little
发明人： Jonathan Herman Fischer , Donald Raymond Laturell , Lane A. Smith , Paul David Hendricks , James M. Little
IPC分类号： H03M162
CPC分类号： H03H17/0411 , H03H17/0288
摘要： An integrated circuit, e.g. an AC '97 conforming audio codec, includes a digital filter and gain module including multiple channels of gain control and multiple channels of digital filtering. A gain control module includes an overflow check of data samples requiring differing lengths of clamping. Each channel of the digital filter includes a finite impulse response (FIR) filter, and an infinite impulse response (IIR) filter. The digital filtering is implemented largely in hardware independent of the number of channels required and/or independent of the required order of the filtering. Thus, filter channels can be added or additional filtering implemented merely by increasing the clock speed without changing the digital filter design. The FIR filter is capable of being reset each frame to prevent a DC buildup at internal nodes. The IIR filter performs a plurality of 2nd order biquadratic equations in an overall average of as few as four clock cycles per 2nd order biquad. A RAM is used to store the state variables for the 2nd order biquadratic equations. The state variable RAM is reset by controlling the clear input of latches at an input and/or the output of the state variable RAM, and the state variable RAM is addressed by a delta counter which is independent of the particular number of filter channels or filter orders implemented. Test patterns may be inserted between functional blocks of an integrated circuit such as the disclosed audio codec by appropriate control of the preset and clear inputs to output latches of the functional blocks.
摘要翻译：集成电路，例如符合AC '97标准的音频编解码器包括数字滤波器和增益模块，包括多个通道的增益控制和多个数字滤波通道。增益控制模块包括需要不同夹持长度的数据样本的溢出检查。数字滤波器的每个通道包括有限脉冲响应（FIR）滤波器和无限脉冲响应（IIR）滤波器。数字滤波主要在硬件上实现，与所需信道数量和/或独立于滤波所需的顺序无关。因此，可以仅通过增加时钟速度而不改变数字滤波器设计来增加滤波器通道或附加滤波。 FIR滤波器能够复位每个帧，以防止在内部节点处产生DC积累。 IIR滤波器执行多个二阶二次方程，其总平均值为每二阶二进制数四个时钟周期。 RAM用于存储二阶二次方程的状态变量。通过控制状态变量RAM的输入端和/或输出端的锁存器的清零输入来复位状态变量RAM，并且状态变量RAM通过与滤波器通道或滤波器的特定数量无关的增量计数器来寻址订单执行。可以通过适当地控制预设和清除输入来输出功能块的锁存器，将测试模式插入诸如公开的音频编解码器的集成电路的功能块之间。

5. 发明授权

US06728371B1 Method and apparatus for stabilization of a line powered modulator circuit 失效
标题翻译：用于稳定线路供电调制器电路的方法和装置
公开(公告)号：US06728371B1
公开(公告)日：2004-04-27
申请号：US09442544
申请日：1999-11-18
申请人： Jonathan Herman Fischer , Keith Eugene Hollenbach , Donald Raymond Laturell , Lane A. Smith , Weilin Zhu
发明人： Jonathan Herman Fischer , Keith Eugene Hollenbach , Donald Raymond Laturell , Lane A. Smith , Weilin Zhu
IPC分类号： H04M100
CPC分类号： H04M19/001
摘要： A method and apparatus for a data access arrangement (DAA) which includes a line modulator containing capacitive elements to increase system stability. The invention provides improved stability during system startup and normal system operation. The line modulator is capable of adjusting the AC modulation and the DC termination presented to the telephone line. Capacitive elements are added to the modulator to provide enhanced system stability. The method includes drawing power from the telephone line, modulating the telephone line, sensing a level of distortion through the line modulator, feeding the sensed level of distortion to the line modulator, and using capacitive circuits to provide additional system stability.
摘要翻译：一种用于数据存取装置（DAA）的方法和装置，其包括一个包含电容元件的线路调制器以增加系统稳定性。本发明提供了在系统启动和正常系统操作期间的改进的稳定性。线路调制器能够调整AC调制和提供给电话线的DC终端。将电容元件添加到调制器以提供增强的系统稳定性。该方法包括从电话线路中抽取电力，调制电话线路，通过线路调制器感测失真水平，将感测到的失真电平馈送到线路调制器，以及使用电容电路来提供额外的系统稳定性。

6. 发明授权

US06621904B1 Pre-charging line modem capacitors to reduce DC setup time 失效
标题翻译：预充电线路调制解调器电容器，以减少直流建立时间
公开(公告)号：US06621904B1
公开(公告)日：2003-09-16
申请号：US09407444
申请日：1999-09-29
申请人： Jonathan Herman Fischer , Keith Eugene Hollenbach , Donald Raymond Laturell , Lane A. Smith , Weilin Zhu
发明人： Jonathan Herman Fischer , Keith Eugene Hollenbach , Donald Raymond Laturell , Lane A. Smith , Weilin Zhu
IPC分类号： H04M100
CPC分类号： H04M19/005 , H04M1/7385
摘要： A circuit provides a modulation signal to an input terminal of a line modulator which places a line current modulated in accordance with the modulation signal on a telephone line. An amplifier of the circuit amplifies an analog input signal to provide the modulation signal at an output terminal. A first resistor and a first capacitor are coupled in series between a first input terminal of the amplifier and the line, and a second resistor and a second capacitor are coupled in series between a second input terminal of the amplifier and the line. First and second precharge amplifiers are used to precharge the first and second capacitors, respectively, to reduce DC setup time.
摘要翻译：电路向线路调制器的输入端提供调制信号，线路调制器将根据调制信号调制的线路电流放置在电话线路上。电路的放大器放大模拟输入信号以在输出端提供调制信号。第一电阻器和第一电容器串联连接在放大器的第一输入端和线路之间，第二电阻器和第二电容器串联耦合在放大器的第二输入端子和线路之间。第一和第二预充电放大器分别用于对第一和第二电容器进行预充电，以减少直流建立时间。

7. 发明授权

US06418220B2 Extended feedback circuit employing capacitive coupling and sampled data filters 有权
标题翻译：采用电容耦合和采样数据滤波器的扩展反馈电路
公开(公告)号：US06418220B2
公开(公告)日：2002-07-09
申请号：US09835741
申请日：2001-04-16
申请人： Jonathan Herman Fischer , Donald Raymond Laturell , Keith Eugene Hollenbach , Steven Brooke Witmer
发明人： Jonathan Herman Fischer , Donald Raymond Laturell , Keith Eugene Hollenbach , Steven Brooke Witmer
IPC分类号： H04M176
CPC分类号： H04M3/005 , H04M1/745
摘要： A network interface circuit employing differentially driven capacitive couplings across a high voltage isolation boundary and in which a &Sgr;/&Dgr; CODEC is positioned on the line side of the high voltage interface. In this manner, only four wires cross the high voltage boundary, namely differential pairs for transmit data and receive data. The transfer functions for setting AC and DC parameters, such as impedance matching, are provided by digital filters. Further, with the CODEC on the line side of the high voltage isolation interface, the data which crosses the interface is modulated at the &Sgr;/&Dgr; data rate and, thus, capacitive coupling can be used across the high voltage isolation boundary without the loss of DC data.
摘要翻译：一种网络接口电路，其跨越高电压隔离边界采用差动驱动的电容耦合，其中SIGMA / DELTA编解码器位于高压接口的线路侧。以这种方式，只有四条电线穿过高压边界，即发送数据和接收数据的差分对。用于设置交流和直流参数（如阻抗匹配）的传递功能由数字滤波器提供。此外，利用高压隔离接口线路侧的编解码器，跨越接口的数据以SIGMA / DELTA数据速率进行调制，因此可以在高电压隔离边界上使用电容耦合，而不会损失 DC数据。

8. 发明授权

US06263304B1 Simplified digitization of PC beep signal for audio codec 失效
标题翻译：音频编解码器的PC蜂鸣声信号的简化数字化
公开(公告)号：US06263304B1
公开(公告)日：2001-07-17
申请号：US08974492
申请日：1997-11-19
申请人： Jonathan Herman Fischer , Donald Raymond Laturell
发明人： Jonathan Herman Fischer , Donald Raymond Laturell
IPC分类号： G06F9455
CPC分类号： G06F3/162
摘要： An improvement to split-architecture audio codecs such as those defined by the Audio Codec '97 specification (AC '97) includes a simulated analog-to-digital (A/D) digitization of the PC beep signal from a personal computer (PC). A PC beep simulated A/D digitization circuit simulates the A/D conversion of the PC beep signal. The PC beep simulated A/D digitization circuit eliminates the need for a pre-amplifier, and reduces the design complexity and power consumption otherwise necessary for an A/D converter, by outputting either of two simulated A/D converter values corresponding respectively to a conversion of the HIGH and LOW logic levels of the PC beep signal. The simulated A/D converter output signal from the PC beep simulated digitization circuit is subsequently scaled and summed with the digital signals from other audio sources, and output from the audio codec.
摘要翻译：对诸如由Audio Codec'97规范（AC '97）定义的解码架构音频编解码器的改进包括来自个人计算机（PC）的PC蜂鸣声信号的模拟模数（A / D）数字化，。 PC嘟嘟模拟A / D数字化电路模拟PC蜂鸣信号的A / D转换。 PC嘟嘟模拟A / D数字化电路消除了对前置放大器的需要，并通过输出分别对应于A / D转换器的两个模拟A / D转换器值中的任一个来降低A / D转换器所需的设计复杂性和功耗 PC的蜂鸣声信号的HIGH和LOW逻辑电平的转换。随后将来自PC蜂鸣声模拟数字化电路的模拟A / D转换器输出信号与来自其他音频源的数字信号相加并从音频编解码器输出。

9. 发明授权

US07003094B2 Adaptive interference cancellation for ADSL 有权
公开(公告)号：US07003094B2
公开(公告)日：2006-02-21
申请号：US09730781
申请日：2000-12-07
申请人： Jonathan Herman Fischer , Donald Raymond Laturell , Vladimir Sindalovsky
发明人： Jonathan Herman Fischer , Donald Raymond Laturell , Vladimir Sindalovsky
IPC分类号： H04M9/08
CPC分类号： H04B3/23 , H04B1/1036
摘要： An ADSL front end is implemented with an adaptive AM interference canceller to cancel out either a carrier signal of an interfering AM radio signal, or a carrier signal and its sidebands of an interfering AM radio signal, from a received ADSL signal. By canceling an interfering AM radio signal rather than simply filtering out the relevant interfered with frequency band, the interfered with frequency band remains useable for ADSL transmission. In one embodiment, a reference AM radio receiver is either fixedly or adaptively tuned to the carrier frequency of an interfering AM radio station, and the received signal in the frequency band surrounding that carrier frequency is digitized and provided to an adaptive interference canceller. The adaptive interference canceller adaptively adjusts a time delay and phase of the generated AM interference signal to optimize cancellation at a hybrid of the same AM radio signal received as interference over a subscriber line. The AM interference canceller may include a Hilbert bandpass filter, tuned to an appropriate carrier frequency by, e.g., an FFT analyzer. An LMS module adaptively adjusts the parameters of the I and Q channels of the Hilbert filter. In another embodiment, instead of including a reference AM radio receiver, only the carrier signal is removed from the received ADSL signal, leaving the presumably less significant sidebands intact. Preferably, a ratio of differential mode coupling to common mode coupling of the interfering AM radio station is determined to result in a better cancellation of the coupled AM interference signal.

10. 发明授权

US06717539B2 Digital-to-analog converter 有权
标题翻译：数模转换器
公开(公告)号：US06717539B2
公开(公告)日：2004-04-06
申请号：US09996209
申请日：2001-11-28
申请人： Jonathan Herman Fischer , Donald Raymond Laturell
发明人： Jonathan Herman Fischer , Donald Raymond Laturell
IPC分类号： H03M166
CPC分类号： H03M1/664 , H03M1/0682 , H03M1/808
摘要： The digital-to-analog converter includes an output line, and a plurality of converters receiving control signals representative of digital data. Each converter selectively connects the output line to a voltage in response to a respective one of the control signals. Optionally, the digital-to-analog converter further includes a reset circuit for resetting the voltage on the output line to a reset voltage between portions of the analog waveform representing a digital data symbol.
摘要翻译：数模转换器包括输出线和接收表示数字数据的控制信号的多个转换器。每个转换器响应于相应的一个控制信号选择性地将输出线连接到电压。可选地，数模转换器还包括复位电路，用于将输出线上的电压复位为表示数字数据符号的模拟波形的部分之间的复位电压。

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