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    Multiplexing/demultiplexing network with series/parallel conversion for TDM system
    1.
    发明授权
    Multiplexing/demultiplexing network with series/parallel conversion for TDM system 失效
    TDM系统的串并转换复用/解复用网络

    公开(公告)号：US3914553A

    公开(公告)日：1975-10-21

    申请号：US50861274

    申请日：1974-09-23

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： MELINDO FLAVIO ,  PERUCCA GIOVANNI

    IPC: H04Q11/04 ,  H04J3/00

    CPC classification number: H04Q11/04

    Abstract: A PCM/TDM terminal has m parallel receiving lines and m parallel transmitting lines for recurrent sequences of n words, of m bits each, originating at or destined for n channels connectable to that terminal by way of two alternately operating conversion units. Each conversion unit comprises an orthogonal matrix of m.n register stages for individual bits, divided into m columns and n rows, the first unit communicating with the channels while the second unit communicates with the terminal and vice versa. In an alternation of switching phases whose duration equals the time period occupied by an m-bit word serially arriving or departing over any channel, the unit communicating with the channels has its n row inputs and its n row outputs respectively connected to the incoming and outgoing channel branches while the unit communicating with the terminal has its m column inputs and its m column outputs respectively connected to the transmitting and receiving terminal lines. Thus, in a first phase the first unit stores in its n rows the bits of as many words arriving over the incoming channel branches and, simultaneously, reads out to the outgoing channel branches the bits of n words previously receiving from the terminal; at the same time the second unit stores in its m columns the bits of n successive words coming from the terminal and reads out to the terminal the bits of as many words previously fed in by the channels. In a second phase the roles of the two units are reversed.

    Abstract translation: PCM / TDM终端具有m个并行接收线和m个并行发送线，用于n个字的复现序列，每个m个位，每个m个位，通过两个交替操作的转换单元发起或发往可连接到该终端的n个通道。 每个转换单元包括用于各个位的m.n个寄存器级的正交矩阵，分成m列和n行，第一单元与通道通信，而第二单元与终端通信，反之亦然。 在交替相位的交替阶段，其持续时间等于通过任何通道串行到达或离开的m位字所占据的时间段，与信道通信的单元具有其n行输入，并且其n行输出分别连接到输入和输出 信道分支，而与终端通信的单元具有其m列输入，并且其m列输出分别连接到发送和接收终端线路。 因此，在第一阶段中，第一单元在其n行存储通过输入信道到达的多个字的位分支，并同时读出输出信道，分支从终端先前接收的n个字的位; 同时，第二单元在其m列中存储来自终端的n个连续字的位，并且向终端读出先前由信道馈送的多个字的位。 在第二阶段，两个单位的角色相反。

    3.
    发明专利
    未知

    公开(公告)号：DE3860235D1

    公开(公告)日：1990-07-19

    申请号：DE3860235

    申请日：1988-03-11

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： MELINDO FLAVIO

    IPC: H04B10/02 ,  C03C14/00 ,  C08L23/08 ,  H04L12/56 ,  H04Q3/52 ,  H04Q11/00 ,  H04Q11/04 ,  H04L12/54 ,  H04B10/00

    Abstract: An optical switching system, wherein the input channels (I) carrying packetized data are switched one by one at high bit rate to output channels (O) through an optical switching network (RC). The packets of a generic input channel are time compressed, converted into optical signals and, at suitable instants, sent to an optical switching network to be switched to the desired output channel, they are then reconverted into electrical signals and expanded to their original duration. A centralized processor (EL) controls the channel switching through the switching network by means of a driving circuit (LC).

    TELEPHONE CIRCUIT FOR OFF-HOOK DETECTION DURING RINGING
    4.
    发明专利
    TELEPHONE CIRCUIT FOR OFF-HOOK DETECTION DURING RINGING 未知

    公开(公告)号：DE3164041D1

    公开(公告)日：1984-07-19

    申请号：DE3164041

    申请日：1981-02-13

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： MELINDO FLAVIO

    IPC: H04M3/02 ,  H04M19/02 ,  H04Q3/00

    Abstract: A circuit arrangement for emitting ringing signals to a subscriber station in response to a call signal electronically generated at a telephone exchange comprises a control unit which, in the presence of such call signal, intermittently reverses a switching relay normally connecting the talking conductors of the subscriber line to monitoring equipment of the exchange whereby these conductors periodically receive a high-voltage ringing current, e.g. of 25 Hz, from a local oscillator in series with a d-c supply. The direct current is blocked by a line-terminating capacitor until the called subscriber lifts the receiver off the hook to close the line loop. If this occurs while the line is connected to the oscillator, a sensor in the control unit detects a significant disparity between the durations of the positive and negative voltage swings in an oscillator cycle and causes the release of the switching relay when that disparity exceeds a dynamic threshold determined by the actual cycle length.

    5.
    发明专利
    未知

    公开(公告)号：DK116083A

    公开(公告)日：1983-09-25

    申请号：DK116083

    申请日：1983-03-10

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： MELINDO FLAVIO ,  SARTORI MARIO

    IPC: H04M3/02 ,  H04M19/02 ,  H04M

    Abstract: An electronic circuit apt to detect the lifting of a telephone handset in presence of ringing current, which is capable of detecting small variations of the d.c. current flowing through the line loop in presence of high a.c. current.It carries out the multiplication of the line current by a constant value and by a pulse signal with suitable frequency and pulse duration; it integrates said current over one or more periods of the ringing signal and compares it with pre-determined thresholds.This circuit allows the use of a single low-value capacitor and is easy-to-integrate.

    6.
    发明专利
    未知

    公开(公告)号：FR2427751A1

    公开(公告)日：1979-12-28

    申请号：FR7912965

    申请日：1979-05-22

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： MELINDO FLAVIO

    IPC: H04Q3/72 ,  H04M19/00 ,  H04Q1/28

    Abstract: The two talking wires of a line loop extending from a subscriber station to a central office, provided with respective blocking capacitors, are connected on the subscriber side of these blocking capacitors to respective signal detectors fed from a common battery and cross-coupled by a common compensating capacitor. The two signal detectors receive outgoing signals from the central-office equipment via a common photoelectric coupler and transmit incoming signals to that equipment by way of respective bistable threshold comparators and individal photoelectric couplers. The two signal detectors with their threshold comparators are constituted in integrated circuity by mutually complementary transistors and diodes together with associated resistors.

    10.
    发明专利
    未知

    公开(公告)号：DK116083D0

    公开(公告)日：1983-03-10

    申请号：DK116083

    申请日：1983-03-10

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： MELINDO FLAVIO ,  SARTORI MARIO

    IPC: H04M3/02 ,  H04M19/02 ,  H04M

    Abstract: An electronic circuit apt to detect the lifting of a telephone handset in presence of ringing current, which is capable of detecting small variations of the d.c. current flowing through the line loop in presence of high a.c. current.It carries out the multiplication of the line current by a constant value and by a pulse signal with suitable frequency and pulse duration; it integrates said current over one or more periods of the ringing signal and compares it with pre-determined thresholds.This circuit allows the use of a single low-value capacitor and is easy-to-integrate.

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