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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：US5111417A
公开(公告)日：1992-05-05
申请号：US559533
申请日：1990-07-19
CPC分类号： H03H17/0685
摘要： A digital filter providing output samples at a rate B while input samples are being provided at a rate A. The filter impulse response h(t) is sampled at a rate P=a.A=b.B, with P being the lowest common multiple to A and B, to derive Np filter coefficients therefrom. The coefficients are arranged into "a" sets of Np/a coefficients and stored. Output samples are then computed by feeding input samples Sn at incoming rate while permutating the sets of coefficients and generating output samples at the output rate.
摘要翻译： 数字滤波器以速率A提供输入采样的速率B提供输出采样。以P = aA = bB的速率对滤波器脉冲响应h（t）进行采样，其中P是A的最低公倍数， B，以从其中导出Np个滤波器系数。 将系数排列成“a”组的Np / a系数并存储。 然后通过以输入速率馈送输入样本Sn来计算输出样本，同时排列系数集合并以输出速率生成输出样本。
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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：US5068875A
公开(公告)日：1991-11-26
申请号：US401679
申请日：1989-09-01
申请人： Michel Quintin
发明人： Michel Quintin
CPC分类号： H04L27/3818
摘要： The adaptive loop gain phase filter of the invention utilizes an averaged value of the phase error at each baud time instead of the phase error for generating the value of the frequency shift. Such an averaged value is obtained by accumulating in accumulator ACCU2 (34) the phase error at each baud time after multiplying it by a factor K.sub.O, and is provided either very M baud time when a counter (38) preset at M reaches O, or if the contents of accumulator (34) reach a predetermined limit value. The value of the frequency shift which is accumulated in accumulator ACCU1 (14) is every accurate and enables the phase disturbance such as line breaks and phase hits to be overcome.
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公开(公告)号：US5058134A
公开(公告)日：1991-10-15
申请号：US397949
申请日：1989-08-24
CPC分类号： H04L27/3455 , H04J3/0605
摘要： In data transmission wherein a transmitting modem transmits data signals to a receiving modem via a telephone line, the process of rotating, in the transmitting modem, the phase of the point of the constellation resulting from a group of data bits by a predetermined phase value, and then rotating, after a predetermined delay in the receiving modem, the phase of the estimated point resulting from the transformation of the analog signal by the opposite of said predetermined phase value, and calculating the mean-squared error between the rotated point and the estimated point of the constellation the error being used to determine whether the receiving modem is out of synchronization.
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公开(公告)号：US5038365A
公开(公告)日：1991-08-06
申请号：US458271
申请日：1989-12-28
申请人： Jacques Belloc , Daniel Pilost , Michel Quintin
发明人： Jacques Belloc , Daniel Pilost , Michel Quintin
CPC分类号： H04L27/00
摘要： Modem receiving from/transmitting to a DTE data bits at a rate DR and adapted for operating at a modulation rate MR in an environment operating at a basic rate BR. In the receiving way, it comprises a first means for converting a number X of samples received at a frequency FS into a number X times MR/BR of samples before processing these samples by the signal processor whereby the processing results in DR/BR words of DR/MR bits, and second means for converting the DR/BR words into DR/MR words of DR/BR bits to be transmitted to the DTE. For the transmitting way the first and second converting means, are the same means but run in the reverse order. The result is that such an adapted modem behaves as a modem operating at a modulation rate MR on a periodic process interval of DR/(BR times MR) seconds.
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