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公开(公告)号：US4211896A
公开(公告)日：1980-07-08
申请号：US949715
申请日：1978-10-10
CPC分类号： H04M19/001 , H04M19/023
摘要： Subscriber's circuit for connecting a subscriber's line to a telephone exchange, comprising a symmetrical amplifier which is arranged between two feed points having different potentials, the amplifier circuit having two input terminals and two output terminals, each one of the output terminals being connected to a wire of the subscriber's line and each input terminal of the symmetrical amplifier circuit being connected to an output of an associated digital-to-analog converter an input of which is connected to the one or to the other feed point by means of a change-over switch, the change-over switches being controlled in phase opposition by a binary digital signal which characterizes a voltage desired for the subscriber's line and which is derived from a digital signal generator under the control of the telephone exchange.
摘要翻译： 用户电路，用于将用户线路连接到电话交换机，包括布置在具有不同电位的两个馈电点之间的对称放大器，放大器电路具有两个输入端子和两个输出端子，每个输出端子连接到电线 的用户线路，并且对称放大器电路的每个输入端子连接到相关联的数模转换器的输出，其输入端通过转换开关连接到一个或另一馈电点 ，转换开关通过二进制数字信号进行相位控制，二进制数字信号表征用户线路所需的电压，并且在电话交换机的控制下从数字信号发生器导出。
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12.发明授权Subscriber's connecting network comprising a symmetrical power amplifier for feeding a subscriber's line 失效用户连接网络包括用于馈送订户线路的对称功率放大器
公开(公告)号：US4321430A
公开(公告)日：1982-03-23
申请号：US175810
申请日：1980-08-06
CPC分类号： H04M19/023 , H04M19/001
摘要： A subscriber's connecting network comprising a symmetrical power amplifier which is formed by two pairs of complementary transistors. Resistors having the same values are arranged in collector circuits of the transistors of the symmetrical amplifier for limiting the current in the subscriber's line. In addition, means are present for making the base voltage dependent on the collector voltage of this transistor so that a predetermined voltage is present between these two electrodes in the normal direction of operation. Finally a by-pass capacitor for the speech currents in the subscriber's line is arranged between two input terminals of the symmetrical amplifier. The invention is particularly suitable for a network in which binary signals are used for the generation of ringing signals and metering signals in the subscriber's line.
摘要翻译： 一种用户的连接网络，包括由两对互补晶体管形成的对称功率放大器。 具有相同值的电阻器被布置在对称放大器的晶体管的集电极电路中，以限制用户线路中的电流。 此外，存在用于使基极电压取决于该晶体管的集电极电压的装置，使得在正常操作方向上在这两个电极之间存在预定电压。 最后，用户线路中的语音电流的旁路电容器被布置在对称放大器的两个输入端之间。 本发明特别适用于其中二进制信号用于在用户线路中产生振铃信号和测量信号的网络。
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公开(公告)号：US4275277A
公开(公告)日：1981-06-23
申请号：US051084
申请日：1979-06-22
CPC分类号： H04M19/005
摘要： Subscriber line interface circuit for connecting a subscriber's telephone line to, for example, an automatic telephone exchange comprising a pair of amplifiers whose outputs are connected to the wires of the telephone line and which are fed by a d.c. voltage supply source. This supply source provides the telephone line with direct current via the amplifiers. In practice, the telephone line must be terminated by a symmetrical impedance of a prescribed value. To this end the interface circuit comprises means for determining the weighted sum of the current flowing through one and through the other wire of the telephone line such that the sum current is independent of the longitudinal currents in the telephone line. By means of an impedance, two antiphase feedback voltages are generated at the inputs of the amplifiers, these amplifiers then having a symmetrical impedance at their outputs.
摘要翻译： 用户线路接口电路，用于将用户电话线路连接到例如自动电话交换机，该自动电话交换机包括一对放大器，其输出端连接到电话线的电线，并由直流电源馈电。 电压源。 该电源通过放大器为电话线提供直流电。 实际上，电话线必须以规定值的对称阻抗来终止。 为此，接口电路包括用于确定流过电话线的一条和另一条线的电流的加权和的装置，使得和电流独立于电话线中的纵向电流。 通过阻抗，在放大器的输入处产生两个反相反馈电压，然后这些放大器在其输出处具有对称的阻抗。
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14.发明授权Circuit arrangement for halving the sampling rate of a delta modulation signal 失效用于将增量调制信号的采样率减半的电路布置
公开(公告)号：US4184150A
公开(公告)日：1980-01-15
申请号：US925779
申请日：1978-07-18
CPC分类号： H04B14/062
摘要： This circuit arrangement, which is connected to a delta modulation encoder operating with a sampling rate F and producing a first delta modulation signal, comprises means for producing the two bits b.sub.2n-1, b.sub.2n-2 which in this first signal precede each of the bits b.sub.2n occurring at the instants 2nT and having a rate F/2, a first flip-flop which is controlled at said instants 2nT for maintaining or not maintaining the state thereof, depending on whether the two above-mentioned bits b.sub.2n-1, and b.sub.2n-2 are identical or not, a second flip-flop to which the output signal of the first flip-flop is applied through a logic circuit, and which assumes either the state of the above-mentioned bit b.sub.2n or the state of the bit b.sub.2n-1, depending on whether the first flip-flop is in the one or in the other state. The output of this second flip-flop produces the desired delta modulation signal.
摘要翻译： 该电路装置连接到以采样率F操作并产生第一增量调制信号的增量调制编码器，包括用于产生在该第一信号中的每个位之前的两个比特b2n-1，b2n-2的装置 b2n发生在时刻2nT并且具有速率F / 2的情况下，根据上述两个比特b2n-1和b2n是否在所述时刻2nT处控制以维持或不保持其状态的第一触发器 -2相同或不同，第二触发器通过逻辑电路施加第一触发器的输出信号，并且假定上述位b2n的状态或位b2n的状态 -1，取决于第一个触发器是处于一个还是另一个状态。 该第二触发器的输出产生期望的增量调制信号。
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公开(公告)号：US4386236A
公开(公告)日：1983-05-31
申请号：US244359
申请日：1981-03-16
CPC分类号： H03K7/08 , H03G3/20 , H04M1/6033
摘要： This arrangement comprises a controllable attenuation circuit of the voice signal received, a pulse-duration modulator which produces pulses the duration of which is modulated by the voice signal supplied by the controllable attenuation circuit, an overshoot detection circuit which produces from the modulated pulses a compression pulse each time it is detected that the amplitude of the modulated voice signal reaches a certain threshold, the compression signal produced by the said overshoot detection circuit being applied in the attenuation circuit to an integrating circuit which produces the attenuation control signal. The amplifier of the loudspeaker receives the modulated signal.
摘要翻译： 这种布置包括接收到的语音信号的可控衰减电路，脉冲持续时间调制器，产生其持续时间由可控衰减电路提供的语音信号调制的脉冲，过冲检测电路从调制脉冲产生压缩 每当检测到调制语音信号的幅度达到一定阈值时，由所述过冲检测电路产生的压缩信号被施加到衰减电路中，以产生衰减控制信号的积分电路。 扬声器的放大器接收调制信号。
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16.发明授权Arrangement for processing a delta modulation signal, in particular for decoding these signals 失效用于处理增量调制信号的装置，特别是用于解码这些信号
公开(公告)号：US4225963A
公开(公告)日：1980-09-30
申请号：US892850
申请日：1978-04-03
CPC分类号： H04B14/062
摘要： A device for processing a signal coded by means of delta modulation with a sampling rate F, comprises an analyzer for the delta modulation signal for successively forming data each of which characterizes the number of binary elements of two successive trains formed by different binary elements, each train comprising a binary element or a series of identical binary elements, a store in which said data are entered, and, finally, means for forming from the data entered into the store a sequence of binary elements composed of .lambda. times the two above-mentioned trains with a frequency of the binary elements equal to 2.lambda.F, .lambda. being an integer exceeding one. The device supplies a digital signal, which, after decoding, constitutes an excellent approximation of the analog signal which had been coded.
摘要翻译： 用于处理以采样率F的Δ调制编码的信号的装置包括用于逐次形成数据的增量调制信号的分析器，每个数据表征由不同二进制元素形成的两个连续列的二进制元素的数量， 包括二进制元素或一系列相同的二进制元素的列表，其中输入所述数据的存储器，以及最后，用于从输入到存储器的数据形成的数据的装置形成由上述两个的λ倍组成的二进制元素的序列 具有等于2λF的二进制元素的频率的列，λ是超过1的整数。 该设备提供数字信号，其在解码之后构成已被编码的模拟信号的极好的近似值。
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公开(公告)号：US4135062A
公开(公告)日：1979-01-16
申请号：US850157
申请日：1977-11-10
CPC分类号： H04M19/001
摘要： Electric network for use in a subscriber's loop, comprising at least two connecting terminals for supplying thereto a current flowing in the subscriber's loop, the network comprising the series arrangement of a capacitive element and a switching device and a threshold device coupled to the connecting terminals and the switching device for either coupling or not coupling, depending on the polarity and the value of said current, said capacitive element to the terminals of the network. This results in a network whose pattern of behavior is optimum for the various signals which are exchanged in the loop.
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