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    • 15. 发明授权
    • Noise blanker and a radio receiver and method employing same
    • 噪声抑制器和无线电接收机以及使用它的方法
    • US5794136A
    • 1998-08-11
    • US710890
    • 1996-09-24
    • Gregory J. BuchwaldLawrence M. EcklundRoy H. Espe
    • Gregory J. BuchwaldLawrence M. EcklundRoy H. Espe
    • H03G3/34H04B1/16
    • H03G3/345
    • A noise blanker (400) suitable for use with a radio receiver (500) having a track and hold unit (509) includes an impulse noise detector (401), a low pass filter (404) that is coupled to the impulse noise detector, and a first amplitude threshold detector (406) that is coupled to the output of the low pass filter and to the input of the track and hold unit. In one embodiment, this noise blanker is configured in conjunction with a radio receiver to yield a radio receiver that substantially minimizes the impact of noise impulses on resulting processed audio. In one embodiment, a second amplitude threshold detector (512) and a repetition rate threshold detector (513) are additionally utilized to allow gating of the internal signal processing paths of the radio receiver in conjunction with operation of the track and hold unit.
    • 适用于具有跟踪和保持单元(509)的无线电接收机(500)的噪声抑制器(400)包括脉冲噪声检测器(401),耦合到脉冲噪声检测器的低通滤波器(404) 以及第一幅度阈值检测器(406),其耦合到所述低通滤波器的输出和所述轨道和保持单元的输入。 在一个实施例中,该噪声消除器被配置为与无线电接收器结合,以产生基本上最小化噪声脉冲对所产生的处理音频的影响的无线电接收机。 在一个实施例中,另外利用第二幅度阈值检测器(512)和重复率阈值检测器(513)来结合轨道和保持单元的操作来允许无线电接收机的内部信号处理路径的门控。
    • 20. 发明授权
    • Controlled feedback path voltage controlled oscillator
    • 受控反馈路径压控振荡器
    • US4733200A
    • 1988-03-22
    • US918943
    • 1986-10-14
    • Lawrence M. EcklundCharles J. Marik
    • Lawrence M. EcklundCharles J. Marik
    • H03B5/02H03B5/36H03B5/12
    • H03B5/02H03B5/366
    • A voltage controlled oscillator having a first feedback path and a second feedback path. The first feedback path may include a phase shift unit (13) as necessary to compensate for an inherent phase shift provided by the resonant circuit (11) used therewith. The second feedback path includes a steering network (17) that responds to an external control signal to cause the output signal to be selectively in either of two phase relations with respect to the incoming signal. The control signal can also control the magnitude of the output signal. By control of the phase relationship and the magnitude, the steering network (17) can effectively control the output frequency of the resonant circuit (11).
    • 一种具有第一反馈路径和第二反馈路径的压控振荡器。 第一反馈路径可以包括相移单元(13),以补偿由其使用的谐振电路(11)提供的固有相移。 第二反馈路径包括响应于外部控制信号的导向网络(17),以使得输出信号相对于输入信号选择性地处于两个相位关系中的任一个中。 控制信号也可以控制输出信号的幅度。 通过控制相位关系和幅度,转向网络(17)能够有效地控制谐振电路(11)的输出频率。