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    Apparatus for extracting the fundamental frequency from a complex audio wave form
    1.
    发明授权
    Apparatus for extracting the fundamental frequency from a complex audio wave form 失效
    用于从复杂音频波形提取基频的装置

    公开(公告)号：US4162461A

    公开(公告)日：1979-07-24

    申请号：US818383

    申请日：1977-07-25

    申请人： David W. Wallis ,  William H. Stewart

    发明人： David W. Wallis ,  William H. Stewart

    IPC分类号： H03H11/12 ,  H03H7/10 ,  H03H7/14

    CPC分类号： H03H11/12

    摘要： Apparatus for extracting the fundamental frequency from a complex audio wave form and for producing a pulse representation of said fundamental frequency includes a low pass filter having a frequency response characteristic which tends to exclude harmonics together with a control circuit including amplifier means, peak detector means and voltage to current converter means for supplying a control signal to the low pass filter thereby to vary the cutoff frequency of the filter and to maintain substantially constant amplitude of the fundmental wave form together with voltage comparator means for comparing the peaks of an alternating current quantity dependent upon the output of said filter with a direct current quantity proportional to the output of the filter, said comparator means thereby producing a pulse per cycle of said fundamental frequency.

    摘要翻译： 用于从复杂音频波形提取基频并用于产生所述基频的脉冲表示的设备包括具有频率响应特性的低通滤波器，其倾向于与包括放大器装置，峰值检测器装置的控制电路一起排除谐波， 电压到电流转换器装置，用于向低通滤波器提供控制信号，从而改变滤波器的截止频率，并且与电压比较器装置一起维持基本上恒定的基波幅度，用于比较交流电流依赖的峰值 在具有与滤波器的输出成比例的直流电流的情况下输出所述滤波器时，所述比较器装置从而产生每个基频周期的脉冲。

    Simplified driver for controlled flux ferrite phase shifter
    2.
    发明授权
    Simplified driver for controlled flux ferrite phase shifter 失效
    用于控制的FLUX FERRITE相位移动器的简化驱动器

    公开(公告)号：US5089716A

    公开(公告)日：1992-02-18

    申请号：US333961

    申请日：1989-04-06

    申请人： David W. Wallis ,  James R. Ashworth ,  Charles G. Wier

    发明人： David W. Wallis ,  James R. Ashworth ,  Charles G. Wier

    IPC分类号： H01P1/19 ,  H03K17/687 ,  H03K17/695

    CPC分类号： H03K17/687 ,  H01P1/19

    摘要： A monostable circuit with device-status feedback control to an external timing terminal is used to controllably change the magnetization state of a ferrite phase shifter core. A pair of such bistable circuits with suitable feedback controls permits a single command pulse of controlled duration to controllably both reset a ferrite core to a saturated magnetic state and then subsequently set the core to a desired non-saturated magnetization state (corresponding to the time duration of the single command pulse). By addition of suitable steering circuits, the controlled resetting and setting of one or more pairs of such ferrite cores can also be achieved using the same single command pulse. The ability to both reset and set plural ferrite phase shifter cores with but a single command pulse of controlled duration permits considerable simplification of beam steering control wiring for a two-dimensional phased array of RF radiators (e.g., so as to provide electronic beam steering control).

    Battery-powered adapter
    3.
    发明授权
    Battery-powered adapter 失效
    电池供电适配器

    公开(公告)号：US5848135A

    公开(公告)日：1998-12-08

    申请号：US509958

    申请日：1995-08-01

    申请人： Jeffrey Elghanayan ,  David W. Wallis

    发明人： Jeffrey Elghanayan ,  David W. Wallis

    IPC分类号： H04N1/00 ,  H04M11/00

    CPC分类号： H04N1/00238 ,  H04N1/00204 ,  H04N1/00241 ,  H04N2201/0015 ,  H04N2201/0034

    摘要： A normally straight-through connection from a computer fax modem to a fax machine, or other fax sender to fax receiver, is briefly interrupted under battery power to supply the fax modem with a simulated dialtone and the fax machine with a simulated ring signal, which is supplied via a DC-to-DC converter activated by the same clock signal from which the dialtone and simulated ring signal are derived.

    摘要翻译： 从计算机传真调制解调器到传真机或其他传真发送器到传真接收器的正常直通连接在电池电源下短暂中断，为传真调制解调器提供模拟拨号音，传真机具有模拟振铃信号， 通过由相同的时钟信号激活的DC-DC转换器提供，该信号从其中导出了拨号音和模拟振铃信号。