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1.发明授权Switching device for connecting a data transmission system to the telephone switched network 失效用于将数据传输系统连接到电话交换网络的切换设备
公开(公告)号：US4910763A
公开(公告)日：1990-03-20
申请号：US322017
申请日：1989-03-13
申请人： Francois Caron , Jean Cholat-Namy , Emile Morlec
发明人： Francois Caron , Jean Cholat-Namy , Emile Morlec
摘要： A data transmission system is described which includes a switching circuit that enables the connection of a tributary modem to a control modem via the public switched network. Switching occurs when it is no longer possible to transmit data on the leased network because the line connected to the tributary modem has failed. The switching circuit can connect either the permanent leased line or the switched network to the receiver of the control modem. It comprises a narrow pass-band filter and detector which is permanently connected between the reception side of the switched network and the control modem receiver. When the tributary modem answers a call from the control modem, it sends a tone ahead of the data message, the frequency of which tone corresponds to the frequency of the pass-band filter and is out of the data band. When such a tone is detected by the detector and pass-band filter, the control modem toggles a two position switch which isolates the leased line and connects the switched network to the receiver of the control modem.
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公开(公告)号：US4887257A
公开(公告)日：1989-12-12
申请号：US164754
申请日：1988-03-07
申请人： Jacques Belloc , Emile Morlec , Dominique Godard , Michel Quintin
发明人： Jacques Belloc , Emile Morlec , Dominique Godard , Michel Quintin
摘要： Echo cancelling device for cancelling echoes affecting the incoming signal received over a two-wire telephone line, comprising near echo canceller 20, far echo canceller 22 and an adder 26 providing the estimated echo signal. A circuit path including a digital-to-analog converter 48 for converting the digital estimated echo signal into analog form and a subtracter 52 for subtracting the resulting analog signal from the analog incoming signal, is separated from a circuit path including an analog-to-digital converter 42 for converting the analog incoming signal into digital form and a subtracter 44 for subtracting the digital estimated echo signal from the resulting digital incoming signal thereby providing a digital signal used as a control signal for adjusting the echo cancellers 20 and 22.
摘要翻译： 用于消除影响通过两线电话线接收的输入信号的回波的回波消除装置，包括近回波消除器20，远回波消除器22和提供估计回波信号的加法器26。 包括用于将数字估计回波信号转换为模拟形式的数模转换器48和用于从模拟输入信号中减去所得到的模拟信号的减法器52的电路路径与包括模拟 - 数字转换器42，用于将模拟输入信号转换成数字形式，减法器44用于从所得到的数字输入信号中减去数字估计回波信号，从而提供用作调整回波消除器20和22的控制信号的数字信号。
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公开(公告)号：US4336423A
公开(公告)日：1982-06-22
申请号：US167573
申请日：1980-07-10
申请人： Emile Morlec , Daniel Reynes , Jean-Pierre Suzzoni
发明人： Emile Morlec , Daniel Reynes , Jean-Pierre Suzzoni
CPC分类号： H04Q3/521 , H01F19/00 , H03H11/485 , H03H11/52
摘要： A switching network includes electronic crosspoint switches for providing electronic connection or disconnection between two voice stations. Each station is connected to the network through a line transformer. When two stations are connected to each other, the voice path in the network includes the secondary winding of the 1st station transformer, a series of crosspoint switches, a middle junctor, a series of crosspoint switches, and the secondary winding of the 2nd station transformer. Each middle junctor includes a negative resistance circuit which introduces a negative resistance in series with the voice path, thus compensating for the series losses in the network, and two negative inductance circuits connected on both sides of the junctor in parallel with the voice path, to compensate for the parallel losses, especially those introduced by the line transformers.
摘要翻译： 交换网络包括用于在两个语音站之间提供电子连接或断开的电子交叉点交换机。 每个站通过线路变压器连接到网络。 当两个站彼此连接时，网络中的语音路径包括第一站变压器的次级绕组，一系列交叉点开关，中间连接器，一系列交叉点开关和第二站变压器的次级绕组 。 每个中间连接器包括负电阻电路，其引入与语音路径串联的负电阻，从而补偿网络中的串联损耗，以及连接在旁路两侧的两个负电感电路与语音路径并行，到 补偿并联损耗，特别是线路变压器引入的损耗。
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公开(公告)号：US4887258A
公开(公告)日：1989-12-12
申请号：US164305
申请日：1988-03-04
申请人： Jacques Belloc , Dominique Godard , Emile Morlec , Michel Quintin
发明人： Jacques Belloc , Dominique Godard , Emile Morlec , Michel Quintin
摘要： Echo cancelling above for providing an echo-free incoming data signal with a phase-roll tracking device comprising phase rotating means (58) for rotating the phase of the generated echo signal by a value X which is the estimated phase-roll value, thereby providing a complex phase-roll corrected echo signal a multiplier (124) for multiplying the error signal; between the incoming signal and the real component (112) of the phase-roll corrected echo signal by the imaginary component (120) of the same signal, thereby providing a value Y function of the variation of the phase-roll; a phase-roll variation estimator (128) providing an estimation Z of the phase-roll variation in half duplex mode or in full duplex mode, in response to value Y; and a phase filter (126) providing the estimated phase-roll value X in response to the estimation Z.
摘要翻译： 用于提供无回波输入数据信号的回波消除与包括相位旋转装置（58）的相位滚动跟踪装置（58），用于使产生的回波信号的相位旋转的值为估计的相位滚动值的值X，从而提供 复数相位滚动校正回波信号，用于乘以误差信号的乘法器（124）; 通过相位信号的虚部（120）在相位滚动校正回波信号的输入信号和实分量（112）之间，从而提供相位变化的值Y函数; 相位滚动变化估计器（128）响应于值Y提供半双工模式或全双工模式中的相位滚动变化的估计Z; 以及响应于所述估计Z提供估计的相位滚动值X的相位滤波器（126）。
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公开(公告)号：US4604713A
公开(公告)日：1986-08-05
申请号：US503965
申请日：1983-06-13
申请人： Dominique Godard , Emile Morlec
发明人： Dominique Godard , Emile Morlec
CPC分类号： H04Q1/457
摘要： The purpose of the receiver is to indicate the reception of a multifrequency signal and to identify said signal. A multifrequency signal is a signal combining two predetermined pure tones, one belonging to a high-frequency range, the other to a low-frequency range. The received signal is sampled at 8 KHz and digitally converted. The signal provided by the converter is simultaneously processed by two tone detectors. Each tone detector comprises: a bandpass filter covering the high- or low-frequency range and supplying the components (x, y) of the filtered signal in Cartesian coordinates; decimation means at the output of said filters; a converter converting the Cartesian coordinates (x, y) into polar coordinates (.rho., .theta.); and logic circuits analyzing the variations of said .rho. and .theta. over fixed periods of time to derive therefrom an identification of the received tone.
摘要翻译： 接收机的目的是指示多频信号的接收并识别所述信号。 多频信号是组合两个预定纯音的信号，一个属于高频范围，另一个属于低频范围。 接收到的信号以8KHz采样并进行数字转换。 由转换器提供的信号由两个音调检测器同时处理。 每个音调检测器包括：覆盖高频或低频范围的带通滤波器，并以笛卡尔坐标提供滤波信号的分量（x，y）; 在所述滤波器的输出处的抽取装置; 将笛卡尔坐标（x，y）转换为极坐标（rho，θ）的转换器; 以及在固定时间段内分析所述rho和θ的变化的逻辑电路，从而导出所接收的音调的标识。
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