公开(公告)号：US4000379A

公开(公告)日：1976-12-28

申请号：US517376

申请日：1974-10-23

Applicant: Michael C. J. Cowpland

Inventor： Michael C. J. Cowpland

IPC: H03B1/00 ,  H03B5/20 ,  H04M1/50 ,  H04Q9/12

CPC classification number: H04M1/50 ,  H03B5/20 ,  H03B2201/0283 ,  H03B2201/031

Abstract: A modified Sallen and key active filter useful for generating tones in a tone generator which can be connected to a telephone line. The modification allows a broad range of frequencies to be generated with a relatively constant output amplitude, the output signal of which can be usefully employed for D.T.M.F. or interoffice multifrequency signal generation.

Abstract translation: 用于在可以连接到电话线的音调发生器中产生音调的经修改的Sallen和键有源滤波器。 该修改允许以相对恒定的输出幅度产生宽范围的频率，其输出信号可以有效地用于D.T.M.F. 或局间多频信号发生。

公开(公告)号：US4178485A

公开(公告)日：1979-12-11

申请号：US906772

申请日：1978-05-17

Applicant: Michael C. J. Cowpland ,  Patrick R. Beirne

Inventor： Michael C. J. Cowpland ,  Patrick R. Beirne

IPC: H03F3/34 ,  H03F3/45 ,  H03F3/62 ,  H04B1/58 ,  H04M3/00 ,  H04M3/02 ,  H04M19/00 ,  H04Q3/00 ,  H04Q3/42 ,  H04Q3/72 ,  H04Q3/18

CPC classification number: H04M3/005 ,  H04B1/586 ,  H04M19/005 ,  H04Q3/00

Abstract: A transformerless bidirectional amplifier useful in a balanced two wire to single wire line circuit, which blocks common mode signals and allows full control of signal levels, impedances, etc. A differential amplifier circuit is connected to the balanced wires, and has its output connected through a buffer amplifier to a single unbalanced wire. A second differential amplifier has its respective input terminals connected to the input and output of the buffer amplifier. The output of the second differential amplifier is connected to one of the balanced wires, and through a resistor to one of the inputs of the first differential amplifier which is connected to the other of the two balanced wires. The value of the latter resistor is such as to apply sufficient output signal from the second differential amplifier to the first differential amplifier so as to cancel a signal from the second differential amplifier which is applied to the first differential amplifier via the first wire of the balanced pair. The second differential amplifier exhibits different gains for the respective two signals applied to its individual inputs which are from the output of the first differential amplifier, whereby they are cancelled.

Abstract translation: 一种无变压器双向放大器，用于平衡双线至单线线路电路，可阻断共模信号，并可完全控制信号电平，阻抗等。差分放大器电路连接到平衡导线，并将其输出连接到 一个缓冲放大器到单个不平衡线。 第二差分放大器的各自的输入端连接到缓冲放大器的输入和输出。 第二差分放大器的输出端连接到一条平衡导线，并通过一个电阻器连接到第一差分放大器的一个输入端，该第一差分放大器的两个平衡导线中的另一个连接。 后一电阻器的值是为了将来自第二差分放大器的足够的输出信号施加到第一差分放大器，以便消除来自第二差分放大器的信号，该信号通过平衡的第一导线施加到第一差分放大器 对。 第二差分放大器对于从其第一差分放大器的输出施加到其各个输入的相应两个信号表现出不同的增益，由此它们被取消。

公开(公告)号：US4281219A

公开(公告)日：1981-07-28

申请号：US62989

申请日：1979-08-02

Applicant: Michael C. J. Cowpland ,  Patrick R. Beirne

Inventor： Michael C. J. Cowpland ,  Patrick R. Beirne

IPC: H04B1/58 ,  H04M3/00 ,  H04M3/40 ,  H04Q3/00 ,  H04Q3/18

CPC classification number: H04Q3/00 ,  H04B1/58 ,  H04B3/03 ,  H04M3/005 ,  H04M3/40

Abstract: A telephone line circuit includes balanced tip and ring leads for connection to a telephone set and an unbalanced line output lead. A first differential amplifier has its input terminals connected through individual equal-valued resistors to the tip and ring leads, the values of each resistor being at least 10 times the off hook impedance of the telephone set. The output of the first differential amplifier is connected in a circuit path to a line output lead, for applying outgoing signals thereto. A second differential amplifier has its input connected in a circuit path to a line input lead for receiving incoming signals, and its output connected in a circuit path to one of the tip or ring leads, and connected by a further resistor to the input of the first differential amplifier which is connected to the other of the tip or ring leads. The value of the further resistor is selected to apply sufficient output signal from the second differential amplifier to the other input of the first differential amplifier so as to substantially cancel signals within the first differential amplifier appearing at its input terminals which were applied from the output of the second differential amplifier to the tip and ring leads.

Abstract translation: 电话线路电路包括用于连接到电话机和不平衡线路输出引线的平衡尖端和环形引线。 第一差分放大器的输入端通过各个等值电阻连接到尖端和环形引线，每个电阻的值至少是电话机脱扣阻抗的10倍。 第一差分放大器的输出端连接到线路输出引线的电路中，用于向其输出信号。 第二个差分放大器的输入端连接到线路输入引线的电路中，用于接收输入信号，其输出端连接到电路中的一个尖端或环形引线，并通过另一个电阻连接到 第一差分放大器连接到尖端或环形引线中的另一个。 选择另外的电阻器的值以将足够的来自第二差分放大器的输出信号施加到第一差分放大器的另一输入，以便基本上消除在其输入端出现的第一差分放大器内的信号， 第二个差分放大器到尖端和环形引线。

公开(公告)号：US4182936A

公开(公告)日：1980-01-08

申请号：US925297

申请日：1978-07-17

Applicant: Patrick R. Beirne ,  Michael C. J. Cowpland ,  Raymond J. Whitbread

Inventor： Patrick R. Beirne ,  Michael C. J. Cowpland ,  Raymond J. Whitbread

IPC: H03F3/62 ,  H03H7/42 ,  H03H11/32 ,  H04B1/58 ,  H04B3/36 ,  H04M7/00 ,  H04M7/04 ,  H04M7/10 ,  H04M19/00 ,  H04Q3/42

CPC classification number: H04B1/587 ,  H03H11/32 ,  H04B1/586 ,  H04M7/0096

Abstract: A transformerless two-way trunk circuit particularly useful for interconnecting a balanced lead pair and an unbalanced lead pair, with complete control over sidetone and signal level. The balanced lead pair is terminated with a first matching A.C. impedance and a second D.C. resistance means. A first transformerless circuit means applies an incoming signal from the unbalanced lead pair to the balanced lead pair, and a second transformerless circuit means applies an incoming signal from the balanced pair to the unbalanced lead pair. A third transformerless circuit means cancels signals from said first circuit means applied to the balanced lead pair to prevent them from being reapplied to the unbalanced lead pair, and a fourth transformerless circuit means cancels signals from said second circuit means applied to the unbalanced lead pair to prevent them from being reapplied to the balanced lead pair.

Abstract translation: 无变压器双向干线电路，特别适用于互连平衡引线对和不平衡引线对，具有对侧音和信号电平的完全控制。 平衡引线对以第一匹配的交流阻抗和第二直流电阻装置终止。 第一无变压器电路装置将来自不平衡引线对的输入信号施加到平衡引线对，并且第二无变压器电路装置将来自平衡对的输入信号施加到不平衡引线对。 第三无变压器电路意味着抵消施加到平衡引线对的所述第一电路装置的信号，以防止它们被重新施加到不平衡引线对，并且第四无变压器电路装置抵消施加到不平衡引线对的所述第二电路装置的信号， 防止他们重新应用于平衡线对。

公开(公告)号：US4219700A

公开(公告)日：1980-08-26

申请号：US941676

申请日：1978-09-12

Applicant: Guido Panizzon ,  Jacob Cepelinski ,  Michael C. J. Cowpland ,  Paul S. Wilker

Inventor： Guido Panizzon ,  Jacob Cepelinski ,  Michael C. J. Cowpland ,  Paul S. Wilker

IPC: H04M1/70 ,  H04M3/16

CPC classification number: H04M1/70

Abstract: A station set interface circuit for connection to a multi-party line, for prohibiting connection of a party line subscriber's set to the party line in the event the line is in use and for returning busy tone to the subscriber's set. A hookswitch flash by the subscriber causes the circuit to connect the subscriber's set to the party line for a predetermined period, while applying a warning tone to the party line for transmission to the parties of the call in progress at the beginning and end of the period.

Abstract translation: 一个用于连接到多方线路的站设置接口电路，用于在线路使用中禁止一方线路用户组与该方线路的连接以及将忙音调回到该用户组。 用户的挂钩切换闪光灯使得电路将订户的设备连接到一方预定的时间段，同时向该方线路应用警告音，以便在该周期的开始和结束时传送给正在进行的呼叫的各方 。

公开(公告)号：US3989902A

公开(公告)日：1976-11-02

申请号：US517375

申请日：1974-10-23

Applicant: Michael C. J. Cowpland

Inventor： Michael C. J. Cowpland

IPC: H04M1/76 ,  H04M1/00

CPC classification number: H04M1/76

Abstract: A regulator which can be used in combination with equipment connected to a telephone type line. The regulator senses the amount of direct current being passed by the line and adjusts its internal AC impedance in inverse relationship thereto. This will shunt alternating current signals more severely when connected to short line loops having relatively small insertion loss, protecting a central office from excessive signal amplitudes.

Abstract translation: 可与电话线路连接的设备组合使用的调节器。 调节器感测通过线路的直流电流量并且与其成反比关系来调节其内部AC阻抗。 当连接到具有相对小的插入损耗的短线路环路时，这将更严格地分流交流信号，从而保护中心局免受过大的信号幅度的影响。

公开(公告)号：US4321431A

公开(公告)日：1982-03-23

申请号：US69054

申请日：1979-08-23

Applicant: Patrick R. Beirne ,  Michael C. J. Cowpland ,  Raymond J. Whitbread

Inventor： Patrick R. Beirne ,  Michael C. J. Cowpland ,  Raymond J. Whitbread

IPC: H03F3/62 ,  H03H7/42 ,  H03H11/32 ,  H04B1/58 ,  H04B3/36 ,  H04M7/00 ,  H04M7/04 ,  H04M7/10 ,  H04M19/00 ,  H04Q3/42

CPC classification number: H04B1/587 ,  H03H11/32 ,  H04B1/586 ,  H04M7/0096

Abstract: A trunk circuit comprises a first lead pair for carrying two-way signals, a second lead pair for carrying two-way signals, a circuit for electrically coupling an incoming signal from the second lead pair to the first lead pair, a first transformerless circuit for applying an incoming signal from the first lead pair to the second lead pair, and a second transformerless circuit for preventing signals from the first circuit applied to the first lead pair from being reapplied to the second lead pair and for preventing signals from the first transformerless circuit applied to the second lead pair from being reapplied to the first lead pair. Preferably the coupling circuit is comprised of a transformer having a primary winding connected in a low impedance voltage source circuit to the second lead pair, and having a secondary winding connected in a very high impedance-to-direct-current circuit for applying the incoming signal from the second lead pair to the first lead pair. Due to the resulting very low current levels in the transformer, the effective bandwidth of the transformer is substantially increased, allowing use of an inexpensive transformer which can readily be incorporated on a plug-in printed circuit board.

Abstract translation: 中继线电路包括用于承载双向信号的第一引线对，用于承载双向信号的第二引线对，用于将来自第二引线对的输入信号电耦合到第一引线对的电路，用于 将来自第一引线对的输入信号施加到第二引线对，以及第二无变压器电路，用于防止施加到第一引线对的第一电路的信号被重新施加到第二引线对，并且用于防止来自第一无变压器电路的信号 施加到第二引线对被重新施加到第一引线对。 优选地，耦合电路包括变压器，其具有连接到第二引线对的低阻抗电压源电路中的初级绕组，并且具有连接在非常高阻抗 - 直流电路中的次级绕组，用于施加输入信号 从第二引线对到第一引线对。 由于变压器中的电流水平非常低，所以变压器的有效带宽显着增加，从而允许使用易于并入插入式印刷电路板的便宜的变压器。

公开(公告)号：US4273965A

公开(公告)日：1981-06-16

申请号：US23999

申请日：1979-03-26

Applicant: Michael C. J. Cowpland ,  Patrick R. Beirne

Inventor： Michael C. J. Cowpland ,  Patrick R. Beirne

IPC: H04Q1/45 ,  H04Q1/453 ,  H04M1/50

CPC classification number: H04Q1/453

Abstract: A multifrequency dialing tone to 2/8 decoding circuit which does not require individual filters for distinguishing individual tone frequencies. The circuit converts the period of each of the received multifrequency signals to individual voltage amplitudes which corresponds thereto, then compares the voltage amplitudes with a predetermined plurality of voltage ranges. Correspondence of a voltage amplitude level with one of the ranges causes production of an output signal, signifying the presence of a particular acceptable multifrequency tone. Individual correspondence signals operate latches which apply signals to decode leads which carry the decoded output signal.

Abstract translation: 多频拨号音到2/8解码电路，不需要单独的滤波器来区分各个音频。 电路将接收到的各个频率信号的周期转换为对应于其的各个电压幅度，然后将电压幅度与预定的多个电压范围进行比较。 电压幅度电平与其中一个范围的对应关系导致输出信号的产生，表示存在特定的可接受的多频调。 单独的对应信号操作锁存器，其施加信号来解码携带解码的输出信号的引线。