-
公开(公告)号：US4774476A
公开(公告)日：1988-09-27
申请号：US69920
申请日：1987-07-06
CPC分类号： H03F1/3211 , H03F2203/45201
摘要： A linearized differential amplifier having two feedback paths. One of the feedback paths functions to linearize the output of the differential amplifier. The remaining feedback path functions to slightly limit the operating range of the differential amplifier to ensure the operational stability of the differential amplifier.
摘要翻译： 具有两个反馈路径的线性化差分放大器。 反馈路径中的一个用于使差分放大器的输出线性化。 剩余的反馈路径用于稍微限制差分放大器的工作范围，以确保差分放大器的运行稳定性。
-
公开(公告)号：US4580284A
公开(公告)日：1986-04-01
申请号：US621283
申请日：1984-06-15
CPC分类号： H04H20/49
摘要： In an AM stereo system wherein a low frequency pilot tone is added to the difference channel signal before modulation of the carrier, "image shifting" and audio distortion in a receiver, due to residual pilot tone signal, are removed by separating out a portion of the pilot tone after it has been filtered and phase shifed for enabling the stereo mode of operation. The separated signal is then inverted and delayed appropriately for each of the PLL and audio circuits.
摘要翻译： 在AM调制立体声系统中，其中在调制载波之前将低频导频信号加到差分信道信号上，由于残余导频音信号，接收机中的“图像移位”和音频失真被分离出一部分 经过滤波和相位移后的导频音使得立体声操作模式成为可能。 然后对于每个PLL和音频电路，分离的信号被反相和适当地延迟。
-
公开(公告)号：US4736166A
公开(公告)日：1988-04-05
申请号：US3895
申请日：1987-01-16
CPC分类号： H03H11/24 , H03G1/0052 , H03G1/04
摘要： An attenuator for use in attenuating an incoming signal. The attenuator includes a primary attenuation unit (12) and a dynamic reference signal unit (13) that provides a reference signal that substantially tracks a DC component associated with the attenuator. A comparison unit (14) subtracts the reference signal from the attenuated signal to provide an attenuated signal substantially free of unwanted signal components. In one embodiment of the invention, a variable impedance unit (101) can be provided to supplement the attenuation action of the attenuator (12) and effectively expand the attenuation range of the circuit and thereby provide greater freedom from distortion.
摘要翻译： 用于衰减输入信号的衰减器。 衰减器包括主衰减单元（12）和动态参考信号单元（13），其提供基本上跟踪与衰减器相关联的DC分量的参考信号。 比较单元（14）从衰减信号中减去参考信号，以提供基本上不需要的信号分量的衰减信号。 在本发明的一个实施例中，可以提供可变阻抗单元（101）以补充衰减器（12）的衰减作用并且有效地扩展电路的衰减范围，从而提供更大的失真自由度。
-
公开(公告)号：US4733200A
公开(公告)日：1988-03-22
申请号：US918943
申请日：1986-10-14
摘要： 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).
摘要翻译： 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。
-
公开(公告)号：US4631745A
公开(公告)日：1986-12-23
申请号：US727936
申请日：1985-04-26
申请人： Charles J. Marik
发明人： Charles J. Marik
摘要： An analog divider circuit as for use in AM stereophonic receivers provides minimum phase variation with control voltage level change, by means of a feedback circuit. The division process is performed by subtracting logarithms of currents produced by the dividend and divisor voltages, then deriving the antilog of the difference or remainder. At the critical point in the process, where junction capacitances do not accurately track the change in the control level, cross-coupled capacitors stabilize the circuit by feeding back a signal from the circuit output to minimize any undesired phase changes.
摘要翻译： 用于AM立体声接收机的模拟分频器电路通过反馈电路提供具有控制电压电平变化的最小相位变化。 通过减去由除数和除数电压产生的电流的对数，然后导出差异或余数的对数来执行除法处理。 在该过程的临界点，当结电容不能精确地跟踪控制电平的变化时，交叉耦合电容器通过从电路输出反馈信号来使电路稳定，以最小化任何不期望的相位变化。
-
公开(公告)号：US3968516A
公开(公告)日：1976-07-06
申请号：US475565
申请日：1974-06-03
CPC分类号： H04N9/68
摘要： An automatic chrominance gain control circuit for a color television receiver distinguishes between lower frequency chrominance variations (large color objects) and higher frequency chrominance variations (small objects) to minimize gain control for large color objects and to emphasize gain control for highly saturated contrasting colors in small objects across the picture field.
摘要翻译： 用于彩色电视接收机的自动色度增益控制电路区分较低频率色度变化（大彩色物体）和较高频率色度变化（小物体），以最大限度地减小大型彩色物体的增益控制，并强调高饱和度对比度色彩的增益控制 整个图片领域的小物体。
-
公开(公告)号：US4903329A
公开(公告)日：1990-02-20
申请号：US61757
申请日：1987-06-15
申请人： Charles J. Marik , Lawrence Ecklund
发明人： Charles J. Marik , Lawrence Ecklund
CPC分类号： H04H20/49
摘要： An AM Stereo receiver is described which includes an AGC having an output which indicates whether the received signal has significantly decreased in level and having a clamping circuit for controlling the voltage at the input of a VCO. The clamping circuit is further defined as having a window detector for sensing a change in the voltage at the input of the VCO according to a predetermined threshold; a selectable controller, responsive to the window detector, for adjusting the voltage at the input of the VCO; and a window reduction circuit, responsive to the output signal of the AGC, for altering the predetermined threshold to provide the controller with a more sensitive indication of a drift in the voltage at the input of the VCO. The receiver additionally includes a conventional locked loop driver for steering the VCO according to the phase of the received input signal. When the AGC output signal indicates that the signal quality of the received signal has significantly decreased in level, or when the window detector indicates that the system is tuned outside of an established narrow "tuned" window, the locked loop driver is disabled to prevent the locked loop driver from introducing a beat note into the VCO.
摘要翻译： 描述了AM立体声接收机，其包括具有指示接收信号是否显着降低的输出的AGC，并具有用于控制VCO输入端的电压的钳位电路。 钳位电路还被定义为具有窗口检测器，用于根据预定阈值感测VCO输入端处的电压变化; 响应于所述窗口检测器的可选择控制器，用于调节所述VCO的输入处的电压; 以及响应于AGC的输出信号的窗口缩小电路，用于改变预定阈值，以向控制器提供在VCO的输入处的电压漂移的更灵敏的指示。 接收器另外包括用于根据接收到的输入信号的相位转向VCO的常规锁定环路驱动器。 当AGC输出信号指示接收信号的信号质量水平显着降低时，或者当窗口检测器指示系统被调谐到建立的窄“调谐”窗口之外时，禁止锁定环路驱动器以防止 锁定环路驱动器将音节引入VCO。
-
公开(公告)号：US4278839A
公开(公告)日：1981-07-14
申请号：US63273
申请日：1979-08-02
申请人： Charles J. Marik
发明人： Charles J. Marik
摘要： A function generator as for use in a system of compatible quadrature AM stereo approximates the tangent function curve, allowing for the provision of essentially undistorted intelligence signals. A form of differential amplifier, including additional multiple threshold transistor circuits with common collectors and common bases, has at its input terminals a signal related to an angle of modulation and provides an output signal approaching a signal related to the tangent of the angle of modulation, the accuracy of the approximation depending on the number of circuits included. The function generator has the capability of providing other similar functions and of use in other applications. As used for AM stereo decoding, a tangent function output is derived from the phase modulation components of the stereo signal and, when multiplied by the amplitude modulated signal, the stereo difference signal can be derived.
摘要翻译： 用于兼容正交AM立体声系统的函数发生器近似于切线函数曲线，允许提供基本上未失真的智能信号。 包括具有共同集电极和公共基极的附加多阈值晶体管电路的差分放大器的形式在其输入端具有与调制角相关的信号，并且提供接近与调制角正切有关的信号的输出信号， 取决于包括的电路数量的近似精度。 函数发生器具有提供其他类似功能并在其他应用中使用的能力。 如用于AM立体声解码，从立体声信号的相位调制分量导出切线函数输出，并且当与幅度调制信号相乘时，可导出立体声差分信号。
-
-
-
-
-
-
-
搜索结果
8 条记录 (耗时 0.014 秒)
