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1. 发明授权

US4552994A Apparatus for isolating the voice frequency path from the floating battery feed during signalling 失效
标题翻译：用于在信令期间将语音频率路径与浮动电池馈送隔离的装置
公开(公告)号：US4552994A
公开(公告)日：1985-11-12
申请号：US449026
申请日：1982-12-13
申请人： Constantine V. Skidanenko , Gregor D. McGibbon
发明人： Constantine V. Skidanenko , Gregor D. McGibbon
IPC分类号： H04M3/22 , H04M19/00 , H04Q1/36 , H04M7/00
CPC分类号： H04Q1/36 , H04M19/008 , H04M3/2272
摘要： In a floating battery feed circuit, the voice frequency is normally connected on the subscriber loop side of the blocking capacitor which is used to prevent the DC loop current from flowing in the winding of the associated voice frequency transformer. This capacitor adversely offsets the dial pulse signals. An optical isolator is responsive to the answer control signal from a dial pulse originating (DPO) channel unit and provides a control signal to a switching circuit, which connects the voice frequency circuit to the loop during answer periods and disconnects the voice frequency circuit from the loop during dial pulse signaling.
摘要翻译：在浮动电池馈电电路中，语音频率通常连接在隔离电容器的用户环路侧，用于防止直流回路电流流入相关语音变频器的绕组。该电容不利于拨号脉冲信号。光隔离器响应来自拨号脉冲发起（DPO）信道单元的应答控制信号，并向切换电路提供控制信号，开关电路在应答周期期间将语音频率电路连接到环路，并将话音频率电路与在拨号脉冲信令期间循环。

2. 发明授权

US4602133A Adaptive echo cancelling system and method utilizing linear code spacing 失效
标题翻译：自适应回波消除系统和利用线性码间隔的方法
公开(公告)号：US4602133A
公开(公告)日：1986-07-22
申请号：US401188
申请日：1982-07-23
申请人： John F. O'Neill
发明人： John F. O'Neill
IPC分类号： H04B3/23 , H04B3/20
CPC分类号： H04B3/231
摘要： An improved adaptive echo cancelling system and method is disclosed. The system and method utilizes linear code spacing and is particularly well suited for echo cancellation of full scale signals. Echo cancellation is effected by use of digital-to-analog converters functioning as a multiplier receiving first digital signals representative of a received speech waveform signal and second digital signals representative of the termination network on the line, which termination network causes and defines an echo reflection of the received signal. The output of the multiplier is summed and the sum is then subtracted from the echo components of the received signal to thus achieve echo cancellation and to produce an error signal that is utilized to continuously reduce error between the actual and estimated echo waveforms. Provision is made to inhibit error indications due to circuit generated coding noise and/or predetermined small detected errors to thereby enhance system operation.
摘要翻译：公开了一种改进的自适应回波消除系统和方法。该系统和方法利用线性码间隔，特别适用于满量程信号的回波消除。回波消除通过使用数字 - 模拟转换器来实现，该数模转换器用作乘法器，其接收表示接收到的语音波形信号的第一数字信号和表示终端网络在线上的第二数字信号，该终端网络引起和限定回波反射的接收信号。乘法器的输出相加，然后从接收信号的回波分量中减去和，从而实现回波消除，并产生用于连续减小实际和估计的回波波形之间误差的误差信号。进行了抑制由电路产生的编码噪声引起的错误指示和/或预定的小的检测错误，从而增强系统操作。

3. 发明授权

US4577064A Auto-balance circuit for battery feed in a telephone circuit 失效
标题翻译：自动平衡电路，用于电话电路中的电池供电
公开(公告)号：US4577064A
公开(公告)日：1986-03-18
申请号：US764518
申请日：1985-08-12
申请人： John M. Huft , Frederick J. Kiko
发明人： John M. Huft , Frederick J. Kiko
IPC分类号： H04M19/00
CPC分类号： H04M19/001
摘要： An active current limited in only the ring side of a telephone circuit has the control branch of a current mirror resistively connected across a supply voltage for establishing the magnitude of loop current in its other branch. A first resistor is also connected between adjacent one sides of the two branches for causing the control voltage and loop current to vary as a function of loop length. Extraneous metallic voltages on the A and B leads are AC coupled to associated inputs of a differential amplifier having its output connected through a second resistor to the one side of the control branch for modulating the loop current provided by the other branch. Opposite sides of the second resistor are fed back to associated input terminals of the amplifier. The amplitude modulated loop current is also fed back to an input of the amplifier for minimizing the affects of induced metallic voltages on the tip and ring lines.
摘要翻译：仅在电话电路的环形侧限制的有功电流具有电流镜的控制分支，电流镜电阻跨过电源电压连接，以建立其另一分支中的环路电流的大小。第一电阻器也连接在两个分支的相邻一侧之间，以使控制电压和环路电流随着环路长度的变化而变化。 A和B引线上的外部金属电压被AC耦合到差分放大器的相关输入，其差分放大器的输出通过第二电阻器连接到控制分支的一侧，用于调制由另一个分支提供的回路电流。第二电阻的相对侧被反馈到放大器的相关输入端。幅度调制回路电流也被反馈到放大器的输入端，以最小化尖端和环形线上的感应金属电压的影响。

4. 发明授权

US4603234A Switching circuit including current limiting and initializing signal isolation 失效
标题翻译：开关电路包括限流和初始化信号隔离
公开(公告)号：US4603234A
公开(公告)日：1986-07-29
申请号：US481552
申请日：1983-04-04
申请人： John M. Huet , Frederick J. Kiko
发明人： John M. Huet , Frederick J. Kiko
IPC分类号： H03K17/082 , H03K17/785 , H03K17/687 , H03K17/78
CPC分类号： H03K17/0822 , H03K17/785
摘要： The A and B leads of a telephone circuit are resistively connected to the drain and source of an FET switch having its gate connected to the emitter of an optoelectric transistor that is also resistively connected across these leads. The collector of a control transistor is also connected to the gate, with its base-emitter diode and emitter bias resistor connected across the source bias resistor for turning on the control transistor and limiting current in the FET when conduction of the latter exceeds a prescribed rate.
摘要翻译：电话电路的A和B引线电阻连接到FET开关的漏极和源极，FET开关的栅极连接到光电晶体管的发射极，光电晶体管的发射极也跨过这些引线电阻连接。控制晶体管的集电极也连接到栅极，其基极 - 发射二极管和发射极偏置电阻连接在源极偏置电阻两端，用于导通控制晶体管，并且当FET的导通超过规定速率时限制FET中的电流。

5. 发明授权

US4510466A Switched capacitor SSB modulator 失效
公开(公告)号：US4510466A
公开(公告)日：1985-04-09
申请号：US392971
申请日：1982-06-28
申请人： Chieh Chang , Man S. Lee
发明人： Chieh Chang , Man S. Lee
IPC分类号： H03C1/62 , H03C1/02 , H03K7/00
CPC分类号： H03C1/62
摘要： An integrated single-sideband modulator comprises six integrated capacitors C1-C6 and first switch means alternately connecting C1 and C2 as feedback capacitors across a differential input operational amplifier A1. The amplifier has a virtual ground potential on its inverting input terminal for causing it to operate as a voltage source and render the circuit relatively insensitive to parasitic capacitance effects associated with capacitor plates. Second switch means cooperates with A1, C1 and C2 and is responsive to 4-phase clock signals for driving input capacitors C3-C6 so as to convert first and second quadrature-phase input signal voltages into first and second electrical charge flow signals on the inverting input terminal that are a function of products of representations of the first and second voltages in switch state time intervals and associated pulse trains which have a 90.degree. phase difference therebetween and a repetitive pattern such as +1, +1, -1, -1, etc. The amplifier and feedback capacitors combine the charge signals for producing a single-sideband signal on A1's output terminal. This circuit is converted to a balanced modulator by omitting C5 and C6. In an alternate embodiment of a single sideband modulator that requires only a pair of switched capacitors C11 and C12, a 4-phase switch means alternately charges C11 and C12 with associated ones of the quadrature-phase input signal voltages while alternately connecting C12 and C11 as feedback capacitors across A1, the polarity of each capacitors feedback voltage being reversed each time that capacitor is connected across the amplifier. This circuit is operated as a balanced modulator by omitting one of the capacitors.

6. 发明授权

US4504804A Switched capacitor balanced modulator/demodulator 失效
标题翻译：开关电容平衡调制器/解调器
公开(公告)号：US4504804A
公开(公告)日：1985-03-12
申请号：US393229
申请日：1982-06-28
申请人： Chieh Chang , Man S. Lee
发明人： Chieh Chang , Man S. Lee
IPC分类号： H03C1/00 , H03C1/02 , H03K7/00
CPC分类号： H03C1/00
摘要： An integrated single-sideband modulator comprises six integrated capacitors C1-C6 and first switch means alternately connecting C1 and C2 as feedback capacitors across a differential input operational amplifier A1. The amplifier has a virtual ground potential on its inverting input terminal for causing it to operate as a voltage source and render the circuit relatively insensitive to parasitic capacitance effects associated with capacitor plates. Second switch means cooperates with A1, C1 and C2 and is responsive to 4-phase clock signals for driving input capacitors C3-C6 so as to convert first and second quadrature-phase input signal voltages into first and second electrical charge flow signals on the inverting input terminal that are a function of products of representations of the first and second voltages in switch state time intervals and associated pulse trains which have a 90.degree. phase difference therebetween and a repetitive pattern such as +1, +1, -1, -1, etc. The amplifier and feedback capacitors combine the charge signals for producing a single-sideband signal on A1's output terminal. This circuit is converted to a balanced modulator by omitting C5 and C6. In an alternate embodiment of a single sidebank modulator that requires only a pair of switched capacitors C11 and C12, a 4-phase switch means alternately charges C11 and C12 with associated ones of the quadrature-phase input signal voltages while alternately connecting C12 and C11 as feedback capacitors across A1, the polarity of each capacitor's feedback voltage being reversed each time that capacitor is connected across the amplifier. This circuit is operated as a balanced modulator by omitting one of the capacitors.
摘要翻译：集成的单边带调制器包括六个集成电容器C1-C6和第一开关装置，交替地将C1和C2作为反馈电容器连接在差分输入运算放大器A1上。放大器在其反相输入端子上具有虚拟接地电位，使其作为电压源工作，并使电路对与电容器板相关的寄生电容效应相对不敏感。第二开关装置与A1，C1和C2配合，并且响应于用于驱动输入电容器C3-C6的4相时钟信号，以便将第一和第二正交相输入信号电压转换成反相的第一和第二电荷流动信号输入端子，其是开关状态时间间隔中的第一和第二电压的表示的乘积的函数，以及在其间具有90°相位差的相关联的脉冲串和诸如+1，+1，-1，-1 等等。放大器和反馈电容器组合了用于在A1输出端子上产生单边带信号的电荷信号。该电路通过省略C5和C6转换为平衡调制器。在仅需要一对开关电容器C11和C12的单个边沿调制器的替代实施例中，4相开关装置交替地对相关的正交相输入信号电压充电C11和C12，同时交替地连接C12和C11作为 A1反馈电容器，每个电容器的反馈电压的极性在每个电容器连接在放大器上时都会反转。该电路通过省略其中一个电容器作为平衡调制器工作。

7. 发明授权

US4504803A Switched capacitor AM modulator/demodulator 失效
标题翻译：开关电容AM调制器/解调器
公开(公告)号：US4504803A
公开(公告)日：1985-03-12
申请号：US393020
申请日：1982-06-28
申请人： Man S. Lee , Chieh Chang
发明人： Man S. Lee , Chieh Chang
IPC分类号： H03C1/00 , H03C1/02 , H03K7/00
CPC分类号： H03C1/00
摘要： A first embodiment of an integrable switched capacitor modulator comprises a differential input operational amplifier A1 having a virtual ground potential impressed on its inverting input terminal; capacitors C1, C2 and C3; and switch means operative for alternately (1) charging C1 with an input voltage while connecting C2 and C3 in series with A1 and across it, respectively, for causing it to produce an inverted version of the input voltage, and (2) discharging C2 and C3 while connecting the sample of the input voltage on C1 across A1 for causing it to output a non-inverted sample of the input voltage. The modulated output signal from A1 is preferrably bandpass filtered to eliminate baseband spectral components fed through A1 when C2 is connected in series with the input terminal thereof. In a second embodiment which is insensitive to feedthrough and which requires only two capacitors C1 and C4, the switch means alternately (1) charges C1 with the input voltage while connecting a prior sample of the input voltage on C4 across A1 for causing it to output an inverted sample of the input voltage, and (2) changes C4 with the input signal while connecting the sample of the input voltage on C1 across A1 in the opposite polarity for causing it to output a non-inverted sample of the input voltage. This embodiment has particular advantage as a demodulator since the built-in sample-and-hold function provides low pass filtering of the output signal of A1.
摘要翻译：可积分开关电容调制器的第一实施例包括具有在其反相输入端施加的虚拟地电势的差分输入运算放大器A1; 电容器C1，C2和C3; 以及开关装置，用于交替地（1）在输入电压C1和C1串联连接C2和C3的同时连续输入电压C1，使其产生反相的输入电压，以及（2）将C2和 C3，同时将A1上的输入电压的采样连接到A1上，使其输出未反相的输入电压。来自A1的调制输出信号优选地被带通滤波以消除当C2与其输入端串联连接时通过A1馈送的基带频谱分量。在对馈通不敏感并且仅需要两个电容器C1和C4的第二实施例中，开关装置交替地（1）将C1与输入电压充电，同时在A1上连接C4上的输入电压的先前采样以使其输出输入电压的反相采样，以及（2）在输入信号的C1反相极性上连接A1上的输入电压的采样，使输出电压输入不反转的样本，改变C4与输入信号。该实施例作为解调器具有特别的优点，因为内置的采样和保持功能提供A1的输出信号的低通滤波。

8. 发明授权

US4587382A Echo canceller using end delay measurement 失效
标题翻译：回波消除器使用终止延迟测量
公开(公告)号：US4587382A
公开(公告)日：1986-05-06
申请号：US403171
申请日：1982-07-29
申请人： Sung M. Yang
发明人： Sung M. Yang
IPC分类号： H04B3/23 , H04B3/20
CPC分类号： H04B3/23
摘要： An echo canceller is connected in the four-wire, voice-frequency path of a communication circuit and includes an end delay analyzer which is bridged between the four-wire transmit and receive paths, and a variable delay and an echo synthesizer connected in series between the received signal path and one input of a summation circuit. The other input to the summation circuit is connected to the four-wire transmit path along which the return echo signal is propagating. Any difference appears as a residual echo at the output of the summation circuit.The end delay analyzer, in response to the received signal and the echo return signal, provides an output control signal that adjusts the variable delay to compensate for the terminal circuit delay which occurs between the echo canceller and the four-wire to two-wire hybrid. This inserts delay in the received signal, which is applied to the echo synthesizer, thus simplifing the echo synthesizer structure as the variable component now must only compensate for the active part of the impulse response of the terminal circuit.
摘要翻译：回声消除器连接在通信电路的四线，语音 - 频道中，并包括桥接在四线发送和接收路径之间的终端延迟分析器，以及可变延迟和回波合成器之间串联连接接收信号路径和求和电路的一个输入。求和电路的另一个输入端连接到回传信号正在传播的四线传输路径。任何差值出现在求和电路输出处的残留回波。结束延迟分析仪响应于接收到的信号和回波信号，提供一个输出控制信号，调节可变延迟以补偿回波消除器与四线到二线混合器之间发生的端子电路延迟。这将延迟接收到的信号加到回波合成器上，从而简化了回波合成器的结构，因为可变分量现在只能补偿终端电路的脉冲响应的有效部分。

9. 发明授权

US4507626A Switched capacitor SSB modulator 失效
标题翻译：开关电容器SSB调制器
公开(公告)号：US4507626A
公开(公告)日：1985-03-26
申请号：US392973
申请日：1982-06-28
申请人： Chieh Chang , Man S. Lee
发明人： Chieh Chang , Man S. Lee
IPC分类号： H03C1/62 , H03C1/02 , H03K7/00
CPC分类号： H03C1/62
摘要： An integrated single-sideband modulator comprises six integrated capacitors C1-C6 and first switch means alternately connecting C1 and C2 as feedback capacitors across a differential input operational amplifier A1. The amplifier has a virtual ground potential on its inverting input terminal for causing it to operate as a voltage source and render the circuit relatively insensitive to parasitic capacitance effects associated with capacitor plates. Second switch means cooperates with A1, C1 and C2 and is responsive to 4-phase clock signals for driving input capacitors C3-C6 so as to convert first and second quadrature-phase input signal voltages into first and second electrical charge flow signals on the inverting input terminal that are a function of products of representations of the first and second voltages in switch state time intervals and associated pulse trains which have a 90.degree. phase difference therebetween and a repetitive pattern such as +1, +1, -1, -1, etc. The amplifier and feedback capacitors combine the charge signals for producing a single-sideband signal on A1's output terminal. This circuit is converted to a balanced modulator by omitting C5 and C6. In an alternate embodiment of a single sideband modulator that requires only a pair of switched capacitors C11 and C12, a 4-phase switch means alternately charges C11 and C12 with associated ones of the quadrature-phase input signal voltages while alternately connecting C12 and C11 as feedback capacitors across A1, the polarity of each capacitors feedback voltage being reversed each time that capacitor is connected across the amplifier. This circuit is operated as a balanced modulator by omitting one of the capacitors.
摘要翻译：集成的单边带调制器包括六个集成电容器C1-C6和第一开关装置，交替地将C1和C2作为反馈电容器连接在差分输入运算放大器A1上。放大器在其反相输入端子上具有虚拟接地电位，使其作为电压源工作，并使电路对与电容器板相关的寄生电容效应相对不敏感。第二开关装置与A1，C1和C2配合，并且响应于用于驱动输入电容器C3-C6的4相时钟信号，以便将第一和第二正交相输入信号电压转换成反相的第一和第二电荷流动信号输入端子，其是开关状态时间间隔中的第一和第二电压的表示的乘积的函数，以及在其间具有90°相位差的相关联的脉冲串和诸如+1，+1，-1，-1 等等。放大器和反馈电容器组合了用于在A1输出端子上产生单边带信号的电荷信号。该电路通过省略C5和C6转换为平衡调制器。在仅需要一对开关电容器C11和C12的单个边带调制器的替代实施例中，四相开关装置交替地对相关的正交相输入信号电压进行充电C11和C12，同时交替地连接C12和C11作为 A1反馈电容器，每个电容器的反馈电压的极性在电容器跨过放大器连接时反转。该电路通过省略其中一个电容器作为平衡调制器工作。

10. 发明授权

US4542265A Echo canceller dynamic range extension 失效
标题翻译：回波消除器动态范围扩展
公开(公告)号：US4542265A
公开(公告)日：1985-09-17
申请号：US496730
申请日：1983-05-20
申请人： Douglas M. Brady
发明人： Douglas M. Brady
IPC分类号： H04B3/23 , H04B3/20
CPC分类号： H04B3/23
摘要： Echo cancellers provide echo return loss enhancement by subtracting a replica of the echo signal from the echo returned via the two-wire to four-wire transition. The echo replica is derived from the signal incoming from the far end by signal processing which consists of a convolution and adaptive modeling that is used to model echo paths caused by the imperfections of the two-wire to four-wire transition. An improved echo return loss enhancement (ERLE) is obtained by dynamic range compression of the incoming signal prior to processing and dynamic range extension following processing. The range extension is slaved to a control signal from the ranged compressor, providing proper compensation for the compressed signal, but insuring that processing noise and other extraneous signals have been adversely treated.
摘要翻译：回波消除器通过从通过两线到四线转换返回的回波中减去回波信号的副本来提供回波回波损耗增强。回波复制品是通过信号处理从远端输入的信号得出的，该信号由卷积和自适应建模组成，用于对由两线到四线过渡的缺陷引起的回波路径进行建模。通过在处理之前的输入信号的动态范围压缩和后续处理的动态范围扩展，获得改进的回波回波损耗增强（ERLE）。范围扩展从属于远程压缩机的控制信号，为压缩信号提供适当的补偿，但确保处理噪声和其他外来信号受到不利影响。

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