利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

57 条记录 (耗时 0.017 秒)

    Ringing tone signal detecting circuit
    32.
    发明授权
    Ringing tone signal detecting circuit 失效
    振铃信号检测电路

    公开(公告)号：US5392347A

    公开(公告)日：1995-02-21

    申请号：US9326

    申请日：1993-01-26

    申请人： Tomokazu Ito ,  Yasunari Shida

    发明人： Tomokazu Ito ,  Yasunari Shida

    IPC分类号： H04M19/04 ,  H04Q1/50 ,  H03K9/06

    CPC分类号： H04M19/04 ,  H04Q1/50

    摘要： A ringing tone signal detecting circuit detects a ringing tone signal from a received signal of the echo canceler type which is supplied from a subscriber line through a hybrid circuit. The ringing tone signal detecting circuit has a sampler for sampling the received signal at a predetermined sampling frequency, a comparator for comparing an output signal from the sampler with a predetermined threshold value and producing a binary digital signal, a plurality of first through nth delay circuits for delaying the binary digital signal from the comparator for 1 through n sampling times, respectively, and a frequency detector for detecting a ringing tone signal from the binary digital signal from the comparator and output signals from the first through nth delay circuits. The circuit has particular use in detecting the ringing tone signals in the 2B1Q signaling code scheme.

    摘要翻译： 振铃信号检测电路根据从用户线通过混合电路提供的回波消除器类型的接收信号来检测振铃音信号。 振铃信号检测电路具有用于以预定采样频率对接收信号进行采样的采样器，用于将来自采样器的输出信号与预定阈值进行比较并产生二进制数字信号的比较器，多个第一至第N延迟电路 用于将比较器的二进制数字信号分别延迟1至n个采样时间;以及频率检测器，用于从来自比较器的二进制数字信号中检测振铃音信号，并输出来自第一至第n延迟电路的信号。 该电路特别用于检测2B1Q信令码方案中的振铃音信号。

    Method of transmitting dual tone multi-frequency during communication in a private branch exchange using keyphones
    33.
    发明授权
    Method of transmitting dual tone multi-frequency during communication in a private branch exchange using keyphones 失效
    在使用键盘的专用交换机交换中传送双音多频的方法

    公开(公告)号：US4907262A

    公开(公告)日：1990-03-06

    申请号：US373403

    申请日：1989-06-30

    申请人： Osul Kwun

    发明人： Osul Kwun

    IPC分类号： H04M3/00 ,  H04Q1/50 ,  H04Q3/62

    CPC分类号： H04Q1/50 ,  H04Q3/625

    摘要： A dual-tone multi-frequency (DTMF) transmission method to allow a keyphone user of a private branch exchange system (PBX) to send the DTMF signal according to dial digits depressed, through a DTMF sender built in the PBX itself, even though there is no DTMF generator in the keyphone on use, when the keyphone user needs to send the DTMF signal to the central office (C.O.) line to control devices that operate at reception of the DTMF signal during making a call to the C.O. line. The method comprises a plurality of control steps operated according to a flow chart of the attached figure.

    摘要翻译： 一种双音多频（DTMF）传输方法，允许专用分支交换系统（PBX）的键盘用户根据拨号数字，通过内置于PBX本身的DTMF发送器发送DTMF信号，即使在那里 当键盘用户需要在中央局（CO）线路上发送DTMF信号以控制在接收到DTMF信号时操作的设备，在拨打CO时，在使用的键盘中没有DTMF发生器 线。 该方法包括根据附图的流程图操作的多个控制步骤。

    Trunk dialing converter
    34.
    发明授权
    Trunk dialing converter 失效
    中继拨号转换器

    公开(公告)号：US4868861A

    公开(公告)日：1989-09-19

    申请号：US187442

    申请日：1988-04-28

    申请人： James H. Leveque

    发明人： James H. Leveque

    IPC分类号： H04Q1/50

    CPC分类号： H04Q1/50

    摘要： A digital FSK trunk dialing converter including M and E lead control is disclosed. The dialing converter further includes an FSK detector which is responsive to consecutive half period intervals of a received FSK signal, and a digital signal-to-noise (S/N) detector or estimator which operates to inhibit or keep the E-wire signal lead deactivated in the presence of noise signals which are received from the communications link in absence of acceptable FSK signals. The FSK detector is comprised of two digital circuits which generate pulses indicative of whether the received FSK signal is greater or less than the FSK center frequency. The pulses are integrated and used to trigger a flip-flop which provides a demodulated digital FSK output indicative of a received high or low FSK analog frequency. An E-wire control signal is generated in the receive logic circuitry in response to the demodulated FSK output. The S/N detector comprises a digital circuit coupled to the FSK detector and is responsive to the pulses generated thereby to generate reset signals which are coupled to logic circuitry when noise signals are received to prevent the generation of an E-wire signal when noise is present.

    Loop to ground start circuit
    35.
    发明授权
    Loop to ground start circuit 失效
    环路到地启动电路

    公开(公告)号：US4221936A

    公开(公告)日：1980-09-09

    申请号：US46974

    申请日：1979-06-08

    申请人： Brian J. N. Vaughan

    发明人： Brian J. N. Vaughan

    IPC分类号： H04M3/22 ,  H04Q1/50 ,  H04M7/00 ,  H04Q3/74

    CPC分类号： H04M3/2272 ,  H04Q1/50

    摘要： A circuit for translating a loop start to a ground start signal in a communication system interconnected via a tip lead and a ring lead, in which the ring lead is connected to a source of potential at a central office or PABX, is comprised of a latching switch connected from a ring lead terminal through a resistance to a ground terminal, a latching switch closing circuit connected to the tip lead for sensing a predetermined potential applied thereto, adapted to close the switch upon its detection of at least a predetermined proportion of the potential applied to the tip lead as a result of the external application of the source of potential from the ring lead to ground, and a latching switch opening circuit adapted to open the switch following connection of the tip lead to ground through external circuity at the central office or PBX.

    摘要翻译： 用于将通过尖端引线和环形引线相互连接的通信系统中的回路开始转换为接地启动信号的电路，其中环形引线连接到中心局处的电位源或PABX，其包括闩锁 开关通过对接地端子的电阻从环形引线端子连接，闭锁开关闭合电路，连接到尖端引线，用于感测施加到其上的预定电位，适于在其检测到至少预定比例的电位时关闭开关 由于外部电源从环形引线接地而施加到尖端引线，以及闭锁开关开路电路，适于在尖端引线通过中心局外部电路连接到地之间打开开关 或PBX。

    Solid state pulsing apparatus for pulsing selected line relay terminals
    36.
    发明授权
    Solid state pulsing apparatus for pulsing selected line relay terminals 失效
    用于脉冲选择线路继电器终端的固态脉冲装置

    公开(公告)号：US4146751A

    公开(公告)日：1979-03-27

    申请号：US848823

    申请日：1977-11-07

    申请人： Raymond Ma

    发明人： Raymond Ma

    IPC分类号： H04Q1/50 ,  H04M3/42

    CPC分类号： H04Q1/50

    摘要： A solid state pulsing circuit and an adapter connector for pulsing the counting and register advance terminals of the L-(line) relay of an originating register in accordance with the digit nature of received DTMF signals is disclosed. The pulsing circuit includes a pair of solid state switches adapted to be alternatively actuated and the adapter connector connects the pulsing circuit to the counting and register advance terminals of the line relay without affecting the normal operation of the relay. Complementary MAKE and BREAK signals derived from the serial pulse output of a DTMF receiver operate the solid state pulsing circuit such that the pulsing circuit alternately pulses (opens and grounds) the counting and register advance terminals of the line relay in accordance with the production of pulses by the DTMF receiver. Other relay terminals (i.e., the terminals controlling the slow release supervisory relay adapted to detect the ON HOOK state of a subscriber's telephone) are not pulsed, whereby annoying line clicks are avoided.

    Digital-to-tone converter utilizing a relaxation oscillator
    37.
    发明授权
    Digital-to-tone converter utilizing a relaxation oscillator 失效
    数字转换器利用放松振荡器

    公开(公告)号：US3763322A

    公开(公告)日：1973-10-02

    申请号：US3763322D

    申请日：1971-10-01

    申请人： INTEGRATED SYSTEMS TECHNOLOGY

    发明人： GARCIA H ,  PEEK B

    IPC分类号： H03M1/82 ,  H03K3/0231 ,  H04Q1/50 ,  H04B7/00

    CPC分类号： H03K3/0231 ,  H04Q1/50

    摘要： A relaxation oscillator is formed by a Schmitt trigger circuit and an operational integrator circuit interconnected to form an oscillatory feedback loop. A diode switching network is constructed to receive a plural-bit digital input signal and to modify a circuit parameter in the oscillator feedback loop to adjust the frequency of oscillation in accordance with the coding of the digital input signal. An active low-pass filter circuit is connected to the output of the operational integrator circuit and supplies a sinusoidal tone signal to an output circuit. A switching circuit is responsive to the digital input signal for disabling the output circuit except during the occurrence of predetermined digital code values.

    摘要翻译： 松弛振荡器由施密特触发电路和互连的操作积分电路形成振荡反馈回路。 二极管开关网络被构造为接收多位数字输入信号并修改振荡器反馈环路中的电路参数，以根据数字输入信号的编码来调节振荡频率。 有源低通滤波器电路连接到运算积分电路的输出端，并将正弦音信号提供给输出电路。 开关电路响应于数字输入信号，用于禁止输出电路，除了发生预定的数字代码值之外。

    Telephone inband signalling system
    38.
    发明授权
    Telephone inband signalling system 失效
    电话信号信号系统

    公开(公告)号：US3562439A

    公开(公告)日：1971-02-09

    申请号：US3562439D

    申请日：1968-06-24

    申请人： ELECTRONIC COMMUNICATIONS

    发明人： LUGTEN LEO K

    IPC分类号： H04Q1/50 ,  H04M1/50

    CPC分类号： H04Q1/50

    摘要： A telephone inband signalling system converts first and second DC signal levels by detecting a change in either direction between the signals to produce a voltage of predetermined time duration which exceeds the time between dial pulses. This latter voltage is employed to simultaneously (a) short the voice path, thereby preventing feedback to the calling party, and (b) enhance the tone of a 2600 hz. oscillator. The oscillator is then onoffed in response to the dial pulses coming over the input. At the end of the conversation, a muted 2600 hz. tone is continuously transmitted indicating an idle line.