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96 条记录 (耗时 0.011 秒)

    Digital amplitude modulating circuitry
    16.
    发明公开
    Digital amplitude modulating circuitry 失效
    Schaltungsanordnung zur digitalen Amplitudenmodulation。

    公开(公告)号：EP0078857A1

    公开(公告)日：1983-05-18

    申请号：EP81109520.7

    申请日：1981-11-05

    申请人： Hewlett-Packard Company

    发明人： Kovalick, Al ,  Hassun, Rolly

    IPC分类号： H04L27/04 ,  H03C1/00 ,  H03B21/02

    CPC分类号： H03C1/00 ,  H03B21/02 ,  H03B28/00 ,  H03B2201/0283 ,  H03C2200/0029 ,  H04L27/04

    摘要： A digital circuitry is provided for modulating the amplitudes of sinusoidal carrier frequency signals in the phase domain. Thereto, a phase accumulator (2) delivers a digital phase signal in response to a carrier frequency signal to be modulated. A modulating phase signal is derived from an analog modulating signal by means of a A/D-converter (70), a ROM (60) containing phase data and a polarity generator (50). The phase signals from the phase accumulator (2) and from the polarity generator (50) are added, converted into sinusoidal amplitude signals and are converted into analog signals having phase modulated signal components with higher frequencies and amplitude modulated signal components with lower frequencies. A low-pass filter (120) delivers the desired analog amplitude modulated output signal.

    摘要翻译： 提供数字电路用于调制相位域中的正弦载波频率信号的振幅。 此外，相位累加器（2）响应于要调制的载波频率信号传送数字相位信号。 通过A / D转换器（70），包含相位数据的ROM（60）和极性发生器（50）从模拟调制信号导出调制相位信号。 来自相位累加器（2）和极性发生器（50）的相位信号被相加，被转换为正弦振幅信号，并被转换为具有较高频率的相位调制信号分量和具有较低频率的幅度调制信号分量的模拟信号。 低通滤波器（120）传送所需的模拟幅度调制输出信号。

    Improvements in or relating to pulsed solid state systems
    17.
    发明公开
    Improvements in or relating to pulsed solid state systems 失效
    Mit Impulsen betriebener Halbleiteroszillator。

    公开(公告)号：EP0034510A1

    公开(公告)日：1981-08-26

    申请号：EP81400037.8

    申请日：1981-01-13

    申请人： THE BENDIX CORPORATION

    发明人： Tresselt, Carl Paul

    IPC分类号： H03B7/14 ,  H03B5/04 ,  G01S7/28 ,  H03C1/00

    CPC分类号： H03B9/12

    摘要： A pulsed solid state system having solid state elements (80) responsive to drive pulses for generating RF signal pulses includes a timing circuit (20,22,24) generating signals which are applied to a pulse forming circuit (33) to provide preheat pulses and immediately subsequent thereto the drive pulses which are applied to the solid state elements (80) so as to reduce chirp and level variations of the generated RF signal pulses. The preheat and drive pulses are formed by transistors (70,74) which are rendered conductive when their current return paths are established through resistors (34,44) whose values determine the levels of the preheat and drive pulses. The duration of the preheat pulses may be made responsive to ambient temperature by using a negative-temperature- coefficient thermistor as the time determining element of the timing circuit (20,22,24) and the level of the preheat pulses may be made responsive to ambient temperature by using positive-temperature .coefficient silicon thermistors in the above mentioned current return path.

    摘要翻译： 具有响应于用于产生RF信号脉冲的驱动脉冲的固态元件（80）的脉冲固态系统包括产生施加到脉冲形成电路（33）以提供预热脉冲的信号的定时电路（20,22,24） 紧随其后施加到固态元件（80）的驱动脉冲，以便减少产生的RF信号脉冲的啁啾和电平变化。 预热和驱动脉冲由晶体管（70,74）形成，当其电流返回路径通过其值确定预热和驱动脉冲的电平的电阻器（34,44）建立时，其被导通。 可以通过使用负温度系数热敏电阻作为定时电路的时间确定元件（20,22-24）来对预热脉冲的持续时间做出响应于环境温度，并且预热脉冲的电平可以响应于 在上述电流返回路径中使用正温度系数硅热敏电阻的环境温度。

    SINGLE AND MULTIPLE SINEWAVE MODULATION AND DEMODULATION TECHNIQUES EMPLOYING CARRIER-ZERO AND CARRIER-PEAK DATA-WORD START AND STOP
    20.
    发明公开
    SINGLE AND MULTIPLE SINEWAVE MODULATION AND DEMODULATION TECHNIQUES EMPLOYING CARRIER-ZERO AND CARRIER-PEAK DATA-WORD START AND STOP 审中-公开
    单个和多个SINUSWELLENMODULATIONS-和-DEMODULATIONSTECHNIKEN与运营NULL和运营商TOP数据字启动和停止

    公开(公告)号：EP1757054A2

    公开(公告)日：2007-02-28

    申请号：EP05745614.7

    申请日：2005-04-14

    申请人： Data Flow Technologies, Inc.

    发明人： BROWN, Forrest, J. ,  KUNZEL, Ronald, E. ,  POWNALL, Charles, V. ,  LOAR, David, W. ,  D'ALESSANDRO, Kenneth

    IPC分类号： H04L27/02 ,  H04L27/28 ,  H03C1/00

    CPC分类号： H04L27/24 ,  H03J1/005 ,  H04L27/02 ,  H04L27/2602

    摘要： A method for detecting encoded digital data from a substantially sinusoidal waveform (10), the encoded digital data having one of a first value and a second value at selected phase angles θn comprises generating the waveform having an amplitude Y defined by a first function at phase angles lying outside of regions having a range Δθ beginning at each phase angle θn, said first function being Y = sinθ; generating the waveform having an amplitude Y defined by the first function at phase angles lying inside the regions having a range of Δθ beginning at each phase angle θn where data of the first value is to be encoded; and generating the waveform having an amplitude Y defined by a second function at phase angles lying inside the regions having a range of Δθ associated with each phase angle θn where data of the second value is to be encoded, the second function being different from Y = sinθ, the detection including deriving sync pulses (16) from minima and maxima of the substantially sinusoidal waveform (10) to frame data words.