公开(公告)号：US4456991A

公开(公告)日：1984-06-26

申请号：US456638

申请日：1983-01-10

Applicant: Ramon C. W. Chea, Jr. ,  Santanu Das ,  Daniel C. Upp ,  Jozef Cornu ,  Johan M. R. Danneels ,  Jean R. J. M. Taeymans

Inventor： Ramon C. W. Chea, Jr. ,  Santanu Das ,  Daniel C. Upp ,  Jozef Cornu ,  Johan M. R. Danneels ,  Jean R. J. M. Taeymans

IPC: H04Q11/04 ,  H04M3/00

CPC classification number: H04Q11/04

Abstract: A telephone line circuit and system for interfacing digital exchange line circuits to a terminal interface of a switching network is disclosed. The system includes controllable active circuit impedance matching means for reducing impedance mismatch between a selected line circuit and the terminal interface. Control means controls both the active circuit impedance matching means for adjusting the effective circuit impedance to a value within a predetermined range, and the conditioning circuit gain pads for selectably adjusting the gain of a transmitted signal. Additionally, control means controls the d.c. line impedance and voltage for adjusting the effective line feed current to the subscriber loop, and provides interfaces for a plurality of line circuits to both a switching network and external processor. Supervision means provides supervision control signals to the control means and thereby permits the telephone line circuit system to provide desired telephone system functions.

Abstract translation: 公开了一种用于将数字交换线电路连接到交换网络的终端接口的电话线电路和系统。 该系统包括可控有源电路阻抗匹配装置，用于减少所选线路电路和终端接口之间的阻抗失配。 控制装置控制有源电路阻抗匹配装置，用于将有效电路阻抗调整到预定范围内的值，以及调节电路增益焊盘，用于可选择地调节发射信号的增益。 另外，控制装置控制直流。 线路阻抗和电压，用于调节到用户环路的有效馈电电流，并且向交换网络和外部处理器提供用于多条线路电路的接口。 监控装置向控制装置提供监控控制信号，从而允许电话线电路系统提供期望的电话系统功能。

公开(公告)号：US4349703A

公开(公告)日：1982-09-14

申请号：US135755

申请日：1980-03-31

Applicant: Ramon C. W. Chea, Jr.

Inventor： Ramon C. W. Chea, Jr.

IPC: H04M3/02 ,  H04M19/02

CPC classification number: H04M19/026 ,  H04M19/023

Abstract: The present invention comprehends an improved ringing circuit particularly suitable for digital telecommunications systems wherein the energizing and de-energizing of the ring circuitry is programmably controlled to provide for either hardware or software generation of ringing cadence, dc bias polarity, dry-switching of ring relays, and other signaling voltages. Further in accordance with the invention, a digital implementation of a complete ringing circuit is achieved without the use of bulky transformers.

Abstract translation: 本发明包括特别适用于数字电信系统的改进的振铃电路，其中可编程地控制环路电路的通电和断电以提供振铃节奏的硬件或软件产生，直流偏置极性，环路继电器的干式开关 ，和其他信令电压。 此外，根据本发明，在不使用笨重的变压器的情况下实现完整的振铃电路的数字实现。

公开(公告)号：US4315106A

公开(公告)日：1982-02-09

申请号：US98104

申请日：1979-11-28

Applicant: Ramon C. W. Chea, Jr.

Inventor： Ramon C. W. Chea, Jr.

IPC: H04B3/50 ,  H04M19/00

CPC classification number: H04M19/008

Abstract: Circuit apparatus for supplying a regulated loop current to a two conductor loop telephone line includes first and second line feed resistances, each having one terminal connected to a respective terminal of the telephone line. A differential amplifier has one input connected to the first resistance and a second input connected to the second resistance in common with the resistance connections to the telephone line terminals. One of the resistances has its other terminal connected to the output of an active circuit means, which circuit operates in a feedback path to supply the desired loop current to the line resistance and therefore the telephone line. The input control signal for the active feedback circuit is derived from summing the output signal from the differential amplifier with a reference signal whose magnitude varies according to the length of the telephone line. The feedback path is supplied by the connection between the output of the active feedback circuit and the line resistance as further coupled to an input of the differential amplifier.

Abstract translation: 用于向两导体环路电话线提供调节回路电流的电路装置包括第一和第二线路馈电电阻，每个线路馈电电阻的一个端子连接到电话线路的相应终端。 差分放大器具有连接到第一电阻的一个输入端和与电话线路端子的电阻连接相同的第二个输入端连接到第二个电阻。 其中一个电阻的另一个端子连接到有源电路装置的输出，该电路在反馈路径中工作，以将所需的环路电流提供给线路电阻并因此提供电话线路。 用于有源反馈电路的输入控制信号来自差分放大器的输出信号与其幅度根据电话线的长度而变化的参考信号相加。 反馈路径由有源反馈电路的输出和线路电阻之间的连接提供，进一步耦合到差分放大器的输入端。

公开(公告)号：US4435803A

公开(公告)日：1984-03-06

申请号：US322606

申请日：1981-11-18

Applicant: Santanu Das ,  Ramon C. W. Chea, Jr. ,  Russ C. Casterline

Inventor： Santanu Das ,  Ramon C. W. Chea, Jr. ,  Russ C. Casterline

IPC: H04M19/02 ,  H04J3/12 ,  H04Q1/22

CPC classification number: H04M19/02

Abstract: An apparatus and method of organizing line interface modules between analog subscriber lines/trunks and a digital switch with the provision for ringing signals which may be shared by a plurality of lines from a single source is described. The ringing signals are intercoupled to any line or lines and transmitted through a common metallic bus which provides immediate ringing for any line, with a shared ring-trip circuit. A software-controlled and/or programmable signal generator in combination with a novel ring-trip circuit is described wherein ringing cadence is generated by connecting the programmable signal generator to a subscriber line for the proper duration and at any desired frequency, whereby multi-frequency ringing can be accomplished under programmable control. A spare line control function within a cluster of telecommunications line circuits is provided such that any telecommunications line circuit can arbitrarily be designated as a spare line, usable to provide temporary service, for example, to a telephone subscriber having a defective line, thereby permitting scheduled maintenance rather than on-demand maintenance. Immediate ringing is provided to groups of analog telephone lines having shared ringing sources and shared ring-trip circuits in a system architecture compatible with a digital switching system.

Abstract translation: 描述了一种在模拟用户线路/中继线之间组合线路接口模块的装置和方法以及数字开关，其中提供了用于从单个源可以由多条线路共享的振铃信号。 振铃信号相互耦合到任何线路或线路，并通过公共金属总线传输，该总线为任何线路提供立即振铃，并具有共享的环路跳闸电路。 描述了与新颖的环形跳闸电路相结合的软件控制和/或可编程信号发生器，其中通过将可编程信号发生器连接到适当持续时间和任何期望频率的用户线路来产生振铃节奏，由此多频 振铃可以在可编程控制下完成。 提供电信线路电路集群内的备用线路控制功能，使得任何电信线路电路可以任意地被指定为备用线路，可用于例如提供临时业务，例如具有缺陷线路的电话用户，从而允许调度 维护而不是按需维护。 在与数字交换系统兼容的系统架构中，立即振铃被提供给具有共享振铃源和共享环路跳闸电路的模拟电话线路组。

公开(公告)号：US4431868A

公开(公告)日：1984-02-14

申请号：US281545

申请日：1981-07-09

Applicant: Daniel M. Bolus ,  Ramon C. W. Chea, Jr.

Inventor： Daniel M. Bolus ,  Ramon C. W. Chea, Jr.

IPC: H04M3/00 ,  H04M19/00 ,  H04Q3/00 ,  H04M3/02 ,  H04M19/02

CPC classification number: H04M19/008 ,  H04M3/005 ,  H04Q3/00

Abstract: A telephone line circuit including a high voltage amplifier feeds the tip and ring lines at its output. This amplifier is fed by a programmable voltage source which includes a d.c./d.c. converter and means to control the amplitude and polarity of this voltage. All the required electrical signals including d.c. feeding, speech, unsymmetrical ringing and metering pulses are provided through the high voltage amplifier. No high voltage AC switches (relay contacts) are required since the ring signal is provided through the same device (output amplifier) as the speech and d.c. signals. Means are included for minimizing the internal power dissipation by controlling the amplitude of the d.c./d.c. converter voltage. Thus d.c. offset control is achieved by slaving the d.c./d.c. converter voltage to the amplifier output voltage. Three functional blocks form the line interface circuit according to the invention, these being a high voltage circuit including the aforementioned amplifier, a programmable signal generator which includes the d.c./d.c. converter and electronic solid state switching under control of a line feed and supervision circuit which constitutes the third block.

Abstract translation: 包括高压放大器的电话线电路在其输出端馈送尖端和环线。 该放大器由可编程电压源（包括d.c./d.c）供电。 转换器和控制该电压的幅度和极性的装置。 所有需要的电信号，包括直流。 通过高压放大器提供馈电，语音，不对称振铃和计量脉冲。 不需要高压交流开关（继电器触点），因为振铃信号通过与语音和直流相同的设备（输出放大器）提供。 信号。 包括用于通过控制d.c./d.c的振幅来最小化内部功耗的手段。 转换器电压。 因此d.c. 偏移控制通过使用d.c./d.c来实现。 转换器电压到放大器的输出电压。 三个功能块形成根据本发明的线路接口电路，这些是包括上述放大器的高压电路，包括d.c./d.c的可编程信号发生器。 转换器和电子固态开关，在构成第三块的送料和监控电路的控制下。

公开(公告)号：US4317963A

公开(公告)日：1982-03-02

申请号：US189976

申请日：1980-09-22

Applicant: Ramon C. W. Chea, Jr.

Inventor： Ramon C. W. Chea, Jr.

IPC: H04M19/00

CPC classification number: H04M19/005

Abstract: A subscriber line interface circuit is described wherein current supplied to a telephone subscriber line from a shared voltage source such as a DC/DC converter is regulated thereby permitting a regulated line current to be supplied to a plurality of line circuits from a single shared voltage source. In accordance with the present invention, both the dc line feed and the ac transmission requirements of a subscriber line interface circuit for a telephone exchange are implemented in a single circuit incorporating ac and dc impedance synthesis techniques. A significant reduction in the heretofore required expensive and bulky discrete components of the subscriber line interface circuit is achieved.

Abstract translation: 描述了一种用户线路接口电路，其中调节从诸如DC / DC转换器的共享电压源提供给电话用户线的电流，从而允许将稳定的线路电流从单个共享电压源提供给多个线路电路 。 根据本发明，用于电话交换机的用户线路接口电路的直流线馈电和交流传输要求都是在包含交流和直流阻抗合成技术的单个电路中实现的。 实现了以前所需的用户线接口电路所需的昂贵且庞大的分立组件的显着减少。

公开(公告)号：US4150368A

公开(公告)日：1979-04-17

申请号：US813434

申请日：1977-07-07

Applicant: Ramon C. W. Chea, Jr.

Inventor： Ramon C. W. Chea, Jr.

IPC: H03M1/00 ,  H04B14/04 ,  H03K13/02 ,  H03K13/20

CPC classification number: H04B14/048 ,  H03M1/008

Abstract: A codec including an encoder section for encoding analog signals in compressed PCM (CPCM) and a decoder section for decoding CPCM information into analog signals features a single companding generator shared by the encoder and decoder sections. In the encoder section, an analog signal to be encoded is sampled periodically and the analog samples are compared with the decaying voltage of the companding generator which includes a capacitor, which is initially charge to a fixed voltage E. The capacitor is then discharge through a fixed resistance to another fixed voltage -dE, the discharge time being measured by a binary digital encoder counter from the start of the discharge until the voltage on the capacitor equals the absolute value of the given analog signal sample, at which time the count of the binary counter represents the desired compressed pulse code of the analog signal samples magnitude. Additionally, a sign bit, derived from the analog signal sample, indicates the polarity of said sample. In the decoder section, a CPCM input signal to be decoded is loaded into a decoder counter, which is decremented to a zero count, while the decaying voltage of the companding generator is sampled. The resultant sample represents the magnitude of the analog signal output for the decoded CPCM code, either directly or inverted, depending upon the sign bit. This sampled signal is further presented to a low-pass filter at a predetermined interval of the codec operating cycle dictated by the sampling frequency. The output of low-pass filter is the desired reconstructed analog signal.

Abstract translation: 包括用于对压缩PCM（CPCM）中的模拟信号进行编码的编码器部分和用于将CPCM信息解码为模拟信​​号的解码器部分的编解码器具有由编码器和解码器部分共享的单个压缩产生器。 在编码器部分中，要周期性地对要编码的模拟信号进行采样，并将模拟采样与包括最初充电到固定电压E的电容器的压电发生器的衰减电压进行比较。然后电容器通过 固定电阻到另一个固定电压-dE，放电时间由二进制数字编码器计数器从放电开始直到电容器上的电压等于给定模拟信号样本的绝对值，此时计数 二进制计数器表示模拟信号采样幅度的期望压缩脉冲编码。 另外，从模拟信号采样得到的符号位表示所述样品的极性。 在解码器部分中，要解码的CPCM输入信号被加载到解码器计数器中，该解码器计数器被递减为零计数，同时对压电发生器的衰减电压进行采样。 所得到的样本代表解码的CPCM代码的模拟信号输出的大小，直接或反转，这取决于符号位。 该采样信号被进一步以由采样频率指定的编解码器操作周期的预定间隔呈现给低通滤波器。 低通滤波器的输出是所需的重构模拟信号。