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公开(公告)号：US4508937A
公开(公告)日：1985-04-02
申请号：US470149
申请日：1983-02-28
CPC分类号： H04M19/04 , H04M1/665 , Y10S379/911
摘要： In the disclosed coded telephone ringing signal method and circuitry, audibly distinguishable ringing codes are generated by alternately shifting between at least a pair of single frequency tones at different modulation rates. Other distinguishable ringing codes are generated by changing both the modulation rates and tone frequencies utilized.
摘要翻译： 在所公开的编码电话振铃信号方法和电路中，通过在不同调制速率的至少一对单频音调之间交替地移动来产生听得见的可区分振铃码。 通过改变所使用的调制速率和音调频率来产生其他可区分的振铃码。
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公开(公告)号：US4491691A
公开(公告)日：1985-01-01
申请号：US470150
申请日：1983-02-28
CPC分类号： H04M19/04
摘要： An electronic tone ringer responds to ringing signals on a telephone line while being unresponsive to dialing pulses or other signals on the line. Powered directly from the telephone line or alternatively from an external DC supply, the ringer uses a digital integration and detection arrangement for distinguishing between valid and invalid ringing signals. A distinctive ringing capability for the tone ringer is also available through the use of two oscillators which allow selection of four frequencies and four modulation rates.
摘要翻译： 电子铃声响应电话线路上的振铃信号，而不响应拨号脉冲或线路上的其他信号。 振铃器可以直接从电话线或外部直流电源供电，使用数字积分和检测装置来区分有效和无效的振铃信号。 通过使用允许选择四个频率和四个调制速率的两个振荡器，也可以获得音调铃声的独特振铃能力。
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公开(公告)号：US4567333A
公开(公告)日：1986-01-28
申请号：US643343
申请日：1984-08-23
CPC分类号： H04M19/04 , Y10S379/911
摘要： An electronic tone ringer provides a distinctive ringing capability through the use of two oscillators which allow selection of four tones and four modulation rates. In determining the type of tone generated, formattable inputs select between frequency shift or amplitude modulation modes or disabling the modulation altogether to generate a single tone. In the frequency shift mode, two fundamental frequencies are generated which are related by a predetermined ratio, the output tone alternating between these two frequencies at one of four selectable modulation rates. In the amplitude modulation mode, a single frequency is switched on and off at the selected modulation rate. All of the tones are produced with a duty cycle appropriate for driving an electromagnetic acoustic transducer.
摘要翻译： 电子铃声通过使用两个振荡器提供独特的振铃能力，这两个振荡器允许选择四个音调和四个调制速率。 在确定产生的音调类型时，格式化输入在频移或幅度调制模式之间进行选择，或完全禁用调制以产生单个音调。 在频移模式中，产生与预定比率相关的两个基本频率，这两个频率之间以四种可选调制速率之一交替出现输出音。 在幅度调制模式中，以所选择的调制速率接通和断开单个频率。 所有的音调都是用适于驱动电磁换能器的占空比产生的。
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公开(公告)号：US4276448A
公开(公告)日：1981-06-30
申请号：US67718
申请日：1979-08-20
CPC分类号： H04M19/04
摘要： An electronic tone ringer responds to ringing signals on a telephone line while being unresponsive to dialing pulses or other signals on the line. Powered directly from the telephone line the ringer uses current sources (223-226) to provide a high impedance to the ringer circuitry and an insensitivity to line voltage variations so that reliable operation of the ringer is maintained on long loops and with multiple ringers terminated on the line. A multitone signal for activating an electroacoustic transducer (300) is provided by frequency modulating a single oscillator (500) within the tone ringer.
摘要翻译： 电子铃声响应电话线路上的振铃信号，而不响应拨号脉冲或线路上的其他信号。 从电话线直接供电，振铃器使用电流源（223-226）为振铃电路提供高阻抗，并且对线路电压变化不敏感，因此振铃器的可靠操作保持在长环路上，多个振铃器终止 线。 用于激活电声换能器（300）的多音频信号通过对音调铃声内的单个振荡器（500）进行频率调制来提供。
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公开(公告)号：US6064864A
公开(公告)日：2000-05-16
申请号：US057029
申请日：1998-04-08
摘要： The present invention provides an antenna interlock system comprising an upper housing and a lower housing. The upper housing has first and second interlock tabs disposed along its interior wall, which correspond to third and fourth interlock tabs disposed along the interior wall of the lower housing, the interlock tabs each having an aperture shaped to closely receive the antenna unit. The interlock tabs are disposed relative to each other such that when the upper and lower housings are assembled together, the apertures in the interlock tabs together define a pathway for receiving the antenna unit, and such that when the antenna unit is inserted through the antenna opening and into the receiving apertures, the antenna unit and the interlock tabs hold the upper and lower housing together.
摘要翻译： 本发明提供了一种天线互锁系统，包括上壳体和下壳体。 上壳体具有沿着其内壁布置的第一和第二互锁突片，其对应于沿着下壳体的内壁设置的第三和第四互锁突舌，每个互锁突片均具有形状以密切接收天线单元的孔。 互锁突舌相对于彼此布置，使得当上壳体和下壳体组装在一起时，互锁翼片中的孔一起限定用于接收天线单元的路径，并且使得当天线单元插入天线开口 并且进入接收孔，天线单元和互锁突片将上壳体和下壳体保持在一起。
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公开(公告)号：US4292604A
公开(公告)日：1981-09-29
申请号：US67717
申请日：1979-08-20
CPC分类号： H04M19/04
摘要： In an oscillatory signal generator circuit exceptional frequency stability is insured by the use of interrelated constant current sources (520, 521, 522) that provide an insensitivity to supply voltage variations over a wide range. Two of the current sources determine the duty cycle by controlling the charge and discharge current of a capacitor (C) in the circuit. A third current source determines the voltage swing on the capacitor. By varying the current output from the third current source, the generator circuit provides a variable frequency signal.
摘要翻译： 在振荡信号发生器电路中，通过使用相互关联的恒定电流源（520,521,522）来保证异常的频率稳定性，这些恒定电流源提供了在宽范围内提供电压变化的不敏感性。 两个电流源通过控制电路中电容器（C）的充放电电流来确定占空比。 第三电流源确定电容器上的电压摆幅。 通过改变来自第三电流源的电流输出，发电机电路提供可变频率信号。
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