-
公开(公告)号：US5963885A
公开(公告)日：1999-10-05
申请号：US718641
申请日：1996-09-17
摘要： The sensing circuit is used in an Asymmetric Digital Subscriber Line (ADSL) transmission system to detect a wave signal with a predetermined shape in an input signal (IN1/IN2) transmitted over the system and applied to an input terminal (IN1/IN2) of the sensing circuit. It includes two branches with a correlated double sampling circuit (CDS1/CDS2), a counter circuit (C1/C2) and a comparator circuit (CMP1/CMP2) coupled in series. An input (IN1/IN2) of the correlated double sampling circuit of each branch is coupled to the input of the sensing circuit and an output of the comparator circuits is coupled to an output terminal (OUT) of the sensing circuit via an OR-ing circuit. The correlated double sampling circuits are adapted to provide a sampled signal and the counter circuits count the number of pulses of the sampled signals. The thus obtained count values are in the comparators are compared with a predetermined value corresponding with the count value which should be obtained when the input signal is a, possibly distorted, signal with the above mentioned predetermined shape. The sensing circuit is clocked by two clock signals, one for each branch, which are in quadrature.
摘要翻译： 感测电路用于非对称数字用户线路（ADSL）传输系统中，以在系统中传输的输入信号（IN1 / IN2）中检测具有预定形状的波信号，并将其应用于输入端（IN1 / IN2） 感测电路。 它包括两个分支，具有相关联的双采样电路（CDS1 / CDS2），一个计数器电路（C1 / C2）和一个串联耦合的比较器电路（CMP1 / CMP2）。 每个分支的相关双采样电路的输入（IN1 / IN2）耦合到感测电路的输入，并且比较器电路的输出通过OR运算耦合到感测电路的输出端（OUT） 电路。 相关的双采样电路适于提供采样信号，并且计数器电路对采样信号的脉冲数进行计数。 将如此获得的比较器中的计数值与对应于当输入信号是具有上述预定形状的可能失真的信号时应当获得的计数值的预定值进行比较。 感测电路由两个时钟信号计时，每个分支一个正交。
-
公开(公告)号：US4737987A
公开(公告)日：1988-04-12
申请号：US826176
申请日：1986-02-05
申请人： Erwin Haussmann
发明人： Erwin Haussmann
摘要： A simple and inexpensive circuit for evaluating the level and frequency ranges of call signals in a telecommunication system. For level evaluation the circuit comprises a pair of oppositely poled threshold value switches and an opto-coupler connected thereto. For frequency evaluation the circuit further comprises at least two series-arranged retriggerable monostable elements whose outputs are connected to a logic circuit. The dwell times of the monostable elements in response to an applied signal establish the frequency range within which a call signal can actuate the output of the logic circuit, thereby indicating whether the signal is within that range.
摘要翻译： 一种用于评估电信系统中呼叫信号的电平和频率范围的简单而廉价的电路。 对于电平评估，电路包括一对相对极化的阈值开关和与其连接的光耦合器。 对于频率评估，电路还包括至少两个串联布置的可再触发单稳态元件，其输出端连接到逻辑电路。 响应于施加的信号的单稳态元件的驻留时间建立了一个频率范围，在该频率范围内，一个呼叫信号可以启动逻辑电路的输出，从而指示信号是否在该范围内。
-
公开(公告)号：US4698769A
公开(公告)日：1987-10-06
申请号：US698095
申请日：1985-02-04
CPC分类号： H04Q1/442
摘要： Supervisory audio tones received from a mobile telephone unit are converted from analog to digital form. The tone is then converted to a complex number by bifurcating the tone path and multiplying one path by a sine function and the other path by a cosine function. The complex numbers are accumulated and the frequencies where significant power exists is found using the discrete Fourier transform. If the power at an assigned frequency exceeds a threshold, the corresponding supervisory audio tone is declared to have been detected.
摘要翻译： 从移动电话单元接收到的监听音频从模拟转换成数字形式。 然后，通过将色调路径分叉并将一个路径乘以正弦函数，并将另一个路径乘以余弦函数，将该音调转换为复数。 利用离散傅立叶变换，求出复数，存在有功功率的频率。 如果分配频率的功率超过阈值，则声明相应的监控音频音被检测到。
-
公开(公告)号：US5610978A
公开(公告)日：1997-03-11
申请号：US366911
申请日：1994-12-30
申请人： Valentin Purits
发明人： Valentin Purits
摘要： A ring discriminator comprised of apparatus for receiving an input ringing signal, a counter, apparatus for applying clock pulses to the counter, apparatus for enabling the counter to count clock pulses from a cycle of ringing current, and apparatus for determining a clock pulse count on the counter to distinguish a frequency characteristic of the ringing signal.
摘要翻译： 一种环形鉴频器，包括用于接收输入振铃信号的设备，用于向计数器施加时钟脉冲的计数器，装置，用于使计数器能够从振铃电流的周期计数时钟脉冲;以及用于确定时钟脉冲计数的装置 该计数器用于区分振铃信号的频率特性。
-
5.发明授权Apparatus for controlling key telephone station set in key telephone system 失效用于控制密钥电话系统中设置的密钥电话站的装置
公开(公告)号：US4932043A
公开(公告)日：1990-06-05
申请号：US248151
申请日：1988-09-23
申请人： Yasunobu Nakayama , Yasuji Sato
发明人： Yasunobu Nakayama , Yasuji Sato
摘要： A key telephone system including a key service unit, a plurality of key telephone station sets which are connected via speech lines for transmission of speech signals and via data lines for transmission of data, and a device provided at the key service unit for sending a predetermined discrimination signal to a selected key telephone station set via an associated speech line, whereby the key service unit sends key telephone station set information to the plurality of key telephone station set via the data lines, and each of the plurality of key telephone station sets derives its own key telephone station set information from the key telephone station set information sent via the data lines, on the basis of the discrimination signal sent via the speech line.
摘要翻译： 一种密钥电话系统，包括密钥服务单元，经由用于传输语音信号的语音线路连接的多个密钥电话站组，以及经由用于传输数据的数据线;以及设置在密钥服务单元处的用于发送预定 识别信号通过相关联的语音线路设置的所选择的密钥电话站，由此密钥服务单元经由数据线向多个密钥电话台发送密钥电话机组信息，并且多个密钥电话机组中的每一个导出 其自己的密钥电话站根据通过语音线路发送的鉴别信号，从密钥电话台设置通过数据线发送的信息。
-
公开(公告)号：US2749394A
公开(公告)日：1956-06-05
申请号：US28193152
申请日：1952-04-11
IPC分类号： H04Q1/442
CPC分类号： H04Q1/4426 , H04Q1/442
-
公开(公告)号：US4939765A
公开(公告)日：1990-07-03
申请号：US440830
申请日：1989-11-24
申请人： Dean L. Benjamin , Wayne K. Wong
发明人： Dean L. Benjamin , Wayne K. Wong
摘要： Corruption of communication signals on a telephone line by the direct (low impedance) interfacing of test equiupment to the line is precluded by a protective interlock circuit, which prevents the test set from seizing the line if data traffic is present. The interlock circuit is coupled between the line circuit to be accessed and the test equipment, and includes a multiple band frequency detector, which monitors the line for signals lying within (in and out-of-audio) frequency bands. Should the detector identify any traffic within its sensitivity range (out of the audio band) during the interval of a timing pulse produced by the closure of a switch, the logic level applied to combinational logic will change state and prevent the generation of a test set enabling signal. The test set enabling signal is normally coupled to a `line-seize` transistor circuit within the test set, so that, without this enabling signal, the test set is effectively locked-out from the line and data cannot be corrupted. Should the frequency detector not have produced an out of audio band detection signal after the expiration of the timing pulse, the combinational logic circuit and an associated flip-flop generate an output signal for enabling the test equipment to seize the line. The flip-flop remains set and the logic level of the output signal is maintained until the line is no longer seized by the test equipment.
摘要翻译： 通过保护互锁电路阻止测试等效线路的直接（低阻抗）接口在电话线路上的通信信号的损坏，如果存在数据流量，则可以防止测试仪卡住线路。 互锁电路耦合在要访问的线路电路和测试设备之间，并且包括多频带频率检测器，其监测线路中位于（频带内和音频外）频带内的信号。 如果检测器在由开关闭合产生的定时脉冲的间隔期间识别其灵敏度范围内（在音频带外）中的任何流量，则应用于组合逻辑的逻辑电平将改变状态并防止产生测试集 启用信号。 测试装置使能信号通常耦合到测试装置内的“线路占用”晶体管电路，因此如果没有这种使能信号，测试装置将被有效地从线路中锁定出来并且数据不会被破坏。 如果频率检测器在定时脉冲期满后没有产生音频带检测信号，则组合逻辑电路和相关联的触发器产生用于使得测试设备能够占用线路的输出信号。 触发器保持置位，并且保持输出信号的逻辑电平，直到线路不再被测试设备占用。
-
公开(公告)号：US4701950A
公开(公告)日：1987-10-20
申请号：US599715
申请日：1984-04-12
申请人： William J. Curtin , Stephen Soto , Steven Krueger
发明人： William J. Curtin , Stephen Soto , Steven Krueger
CPC分类号： H04M3/51 , H04M3/2272 , H04M3/5108 , H04Q1/38 , H04Q1/442
摘要： A telephone answering system for use in conjunction with a PBX/CENTREX system for answering incoming calls directed to any of the extension lines within the system. The telephone answering system includes an operator control station and a line detection system. The line detection system monitors the telephone lines within the PBX/CENTREX system. This detection system includes a plurality of ring/hook interfaces each of which is connected in parallel across one of the telephone lines in the PBX/CENTREX system being monitored. Each of the interfaces has a ring detector for detecting a ring signal on the associated telephone line for providing a ring count when there is an incoming call and a hook detector for detecting the on/off hook condition on the associated telephone line. A coupling mechanism couples the ring detector and the hook detector to the operator control station for providing information to the operator control station indicative of the ring count and hook conditions of the telephone lines being monitored. The operator control station is coupled to the detector and provides a signal for causing the PBX/CENTREX system to carry out a directed call pick-up when the ring count on a monitored telephone line has exceeded a preselected limit without the incoming call being answered and for transferring such incoming call to said operator control station for answering by an operator.
摘要翻译： 与PBX / CENTREX系统一起使用的电话应答系统，用于应答指向系统内任何延长线的呼入。 电话应答系统包括操作员控制站和线路检测系统。 线路检测系统监控PBX / CENTREX系统内的电话线路。 该检测系统包括多个环/钩接口，每个环/钩接口并联连接在被监控的PBX / CENTREX系统中的一条电话线上。 每个接口具有环形检测器，用于检测相关联的电话线路上的振铃信号，以便在有来电时提供铃声计数，以及用于检测相关电话线路上的开关状态的挂钩检测器。 耦合机构将环形检测器和挂钩检测器耦合到操作员控制站，以向操作员控制站提供指示被监视的电话线路的振铃计数和挂钩状况的信息。 运营商控制站耦合到检测器，并提供一个信号，使PBX / CENTREX系统在受监控的电话线上的振铃数超过预选的限制而不接听来电时执行定向呼叫接收， 用于将这样的呼入转移到所述操作员控制站以供操作员应答。
-
-
-
-
-
-
-
搜索结果
9 条记录 (耗时 0.008 秒)
