公开(公告)号：US4242542A

公开(公告)日：1980-12-30

申请号：US966100

申请日：1978-12-04

申请人： Mahlon D. Kimbrough

发明人： Mahlon D. Kimbrough

IPC分类号： H04B3/38 ,  H04H1/08 ,  H04B3/32 ,  H04B3/36

CPC分类号： H04B3/38

摘要： A frogging signal repeater for a transmission line communications system such as a telephone system having a trunk line connected between a pair of signal sources such as end central offices and/or standard signal repeaters. Each signal source generates information signals on a group of relatively high frequency carrier signals and receives information signals on a group of relatively low frequency carrier signals with the frogging signal repeater connected in the trunk line for translating the high and low frequency groups. The repeater includes means responsive to a high frequency group signal from one signal source for generating a coordination reference signal representing the length of the transmission line between the repeater and the one signal source and means responsive to the coordination reference signal and the high frequency group signals from the other signal source for generating the low frequency group signals to the one signal source whereby the low frequency group signals arrive at the one signal source at a predetermined magnitude.

摘要翻译： 用于诸如电话系统的传输线通信系统的蛙式信号中继器，其具有连接在一对信号源（例如终端中心局）和/或标准信号中继器之间的中继线。 每个信号源在一组相对较高频率的载波信号上产生信息信号，并在一组相对较低频率的载波信号上接收信息信号，其中在中继线上连接有蛙跳信号中继器，用于转换高频和低频组。 中继器包括响应来自一个信号源的高频组信号的装置，用于产生表示中继器和一个信号源之间的传输线的长度的协调参考信号，以及响应协调参考信号和高频组信号 从另一个信号源产生低频组信号到一个信号源，从而低频组信号以预定的大小到达一个信号源。

公开(公告)号：US4214129A

公开(公告)日：1980-07-22

申请号：US966194

申请日：1978-12-04

申请人： Mahlon D. Kimbrough

发明人： Mahlon D. Kimbrough

IPC分类号： H04B1/12 ,  H04J1/12 ,  H04J1/14

CPC分类号： H04J1/14 ,  H04B1/12 ,  H04J1/12

摘要： A receiver in a transmission line communications system, such as a telephone system, receives a carrier signal having upper and lower sidebands. Typically, the carrier signal is modulated with message information signals and the upper sideband is modulated with signaling signals. A sideband cancellation circuit is utilized to cancel the lower sideband which is modulated with the unwanted signaling signals for the upper sideband of the next lower carrier signal in a multi-channel telephone system. The modulated carrier and sideband signals are split into two separate demodulation paths such that the unwanted information signals in each path are one hundred eighty degrees out of phase and the wanted information signals are in phase. The demodulated information signals from the two paths are summed to cancel the unwanted information signals from the lower sideband.

摘要翻译： 诸如电话系统的传输线通信系统中的接收机接收具有上边带和下边带的载波信号。 通常，载波信号用消息信息信号进行调制，上边带用信号信号进行调制。 边带消除电路用于消除在多声道电话系统中用于下一个较低载波信号的上边带的不需要的信令信号进行调制的下边带。 调制的载波和边带信号被分成两个单独的解调路径，使得每条路径中的不需要的信息信号相位相差180度，并且有用信息信号同相。 来自两个路径的解调信息信号被相加以从低边带消除不想要的信息信号。

公开(公告)号：US4087639A

公开(公告)日：1978-05-02

申请号：US763607

申请日：1977-01-28

申请人： Gerald Wayne Beene ,  Robert P. Cates

发明人： Gerald Wayne Beene ,  Robert P. Cates

IPC分类号： H04J1/06 ,  H04J1/12

CPC分类号： H04J1/06

摘要： A plural channel amplitude modulated telephone carrier system having a plurality of transmitters to provide for the transmission of a like plurality of frequency division multiplexed, amplitude modulated carrier signals in a common direction along a transmission line to a remote termination of the transmission line, and an automatic carrier level coordination control circuit having a first circuit means for developing a d.c. control signal that varies as a predetermined function of the transmission line length, and a second circuit means connected to the first circuit means for controlling the transmit power of each of the aforesaid carrier signals as a function of its own carrier frequency and as a function of the d.c. control signal. The telephone carrier system may be of the station carrier type and may have two or more plural channel amplitude modulated carrier sub-systems, each having its own transmission line. The automatic carrier level coordination control circuit is designed to be common to two or more of the carrier sub-systems.

摘要翻译： 一种具有多个发射机的多信道幅度调制电话载波系统，用于提供沿着传输线向传输线路的远程终端在公共方向上传输相同多个频分复用的幅度调制载波信号，以及 自动载波电平协调控制电路具有用于开发dc的第一电路装置 作为传输线路长度的预定功能而变化的控制信号，以及连接到第一电路装置的第二电路装置，用于根据其本身的载波频率控制上述载波信号中的每一个的发射功率，并且作为 直流 控制信号。 电话载波系统可以是站载波类型，并且可以具有两个或多个多信道幅度调制载波子系统，每个具有其自己的传输线。 自动载波电平协调控制电路被设计为对于两个或多个载波子系统是共同的。

公开(公告)号：USRE29499E

公开(公告)日：1977-12-20

申请号：US584065

申请日：1975-06-05

申请人： Lucian W. Spencer

发明人： Lucian W. Spencer

IPC分类号： H04B3/46 ,  H04M1/24 ,  H04M3/30

CPC分类号： H04B3/46 ,  H04M1/24 ,  H04M3/301

摘要： The instant invention relates to a device that permits a telephone line (loop) to be tested from a telephone central office, thereby eliminating the expense resulting from a visit by a repairman to a subscriber's premises. The disclosed device is responsive to an audio tone of a predetermined frequency, is located on a subscriber's premises and is activated by an audio tone of frequency within the pass band of the telephone circuit, this tone being transmitted from a central office. A tuned detector, located within the device, upon receiving said predetermined tone, actuates a timing circuit and relay circuit that places a circuit across the tip and ring of a telephone line. The circuit simulates the electrical condition of a telephone instrument in the "off hook" position and causes central office line equipment to operate, if the telephone loop is in an operable state, thereby indicating that the telephone loop is complete from the central office to the subscriber's premises.

公开(公告)号：US4027224A

公开(公告)日：1977-05-31

申请号：US409093

申请日：1973-10-24

申请人： Gerald W. Beene

发明人： Gerald W. Beene

IPC分类号： H02M3/00 ,  H04M19/08 ,  G05F3/14

CPC分类号： H04M19/08 ,  H02M3/00

摘要： A post regulated switching regulating d.c.-to-d.c. converter with pulse width modulation for limiting the regulated output voltage to a magnitude which is just slightly higher than the normal regulated value if the regulation capabilities of the converter are exceeded either by increasing the input voltage above a certain amount for a given load or by decreasing the load resistance below a minimum value.

摘要翻译： 后调节开关调节直流到d.c。 转换器，其具有脉冲宽度调制，用于将调节的输出电压限制到略高于正常调节值的幅度，如果通过将输入电压增加到给定负载一定量以上或通过减小转换器的调节能力 负载电阻低于最小值。

公开(公告)号：US4253180A

公开(公告)日：1981-02-24

申请号：US966146

申请日：1978-12-04

申请人： Mahlon D. Kimbrough

发明人： Mahlon D. Kimbrough

IPC分类号： H03L7/08 ,  H04B3/38 ,  H04J1/02 ,  H03B3/04

CPC分类号： H04B3/38 ,  H03L7/08

摘要： A voltage controlled oscillator which may be used in the receiver of a communications system, such as a carrier telephone system, for aiding in the demodulation of received carrier signals. The oscillator includes circuitry for generating first and second reference signals at a frequency equal to the carrier signal. Also included in the oscillator is circuitry which in response to the magnitude of an error signal variably connects a frequency determining electrical parameter to the frequency generating circuitry to thereby vary the frequency of the reference signals. The error signal magnitude represents the difference in phase between the carrier signal and the first reference signal.

摘要翻译： 可用于诸如载波电话系统的通信系统的接收机中用于辅助解调所接收的载波信号的压控振荡器。 振荡器包括用于以等于载波信号的频率产生第一和第二参考信号的电路。 还包括在振荡器中的电路响应于误差信号的大小可变地将频率确定电参数连接到频率发生电路，从而改变参考信号的频率。 误差信号幅度表示载波信号和第一参考信号之间的相位差。

公开(公告)号：US4213015A

公开(公告)日：1980-07-15

申请号：US966000

申请日：1978-12-04

申请人： Mahlon D. Kimbrough

发明人： Mahlon D. Kimbrough

IPC分类号： H04J1/16 ,  H04Q11/02 ,  H04J1/12 ,  H04B1/16

CPC分类号： H04J1/16 ,  H04Q11/02

摘要： A power failure alarm circuit for a transmission line communications system such as a telephone system having means for transmitting and receiving carrier signals connected to a trunk line at an end central office. The alarm circuit monitors the power level of a selected number of the different frequency carriers received on the trunk line and generates an alarm condition signal when the combined power levels fall below a predetermined magnitude. The carrier signal receiving means responds to the alarm condition signal to release the subscribers. After a predetermined delay, the alarm circuit generates an alarm busy signal and the receiving means responds by forcing the trunk lines busy to prevent seizure by new callers. The alarm circuit also monitors the level of power being sent to signal repeaters connected to the trunk line and generates an enable signal when said power is lost. The transmitting means responds to the enable signal by pulsing the carrier signals to signal another end central office of the alarm condition.

摘要翻译： 一种用于诸如电话系统的传输线通信系统的电力故障报警电路，具有用于发送和接收连接到终端中心局的中继线的载波信号的装置。 报警电路监视在中继线路上接收到的选定数量的不同频率载波的功率电平，并且当组合功率电平低于预定量值时产生报警条件信号。 载波信号接收装置响应报警条件信号以释放用户。 在预定的延迟之后，报警电路产生报警忙信号，并且接收装置通过强制中继线繁忙来防止新呼叫者卡住。 报警电路还监控发送到连接到中继线的信号中继器的电力电平，并在所述电源丢失时产生使能信号。 发送装置通过脉冲载波信号来响应使能信号，以向另一个中心局通知警报状况。

公开(公告)号：US4081609A

公开(公告)日：1978-03-28

申请号：US763520

申请日：1977-01-28

申请人： Gerald Wayne Beene ,  Hubert C. Martin, Jr.

发明人： Gerald Wayne Beene ,  Hubert C. Martin, Jr.

IPC分类号： H04M19/04 ,  H04H1/04

CPC分类号： H04M19/04

摘要： A plural channel amplitude modulated station carrier signalling circuit in which an incoming call for a subscriber served by the station carrier system is sensed at the called subscriber's subscriber channel terminal circuit by synchronously detecting a signal which originates from a central office to signal the incoming call for the subscriber.